A kangaroo jumps straight up to a vertical height of 1.45 m. The time the kangaroo was in the air before returning to the ground was 0.5304 seconds. The given data can be used to calculate the time the kangaroo was in the air before returning to the ground.
How high did the kangaroo jump vertically?The initial velocity of the kangaroo is zero since it was at rest, and it jumps straight up to a height of 1.45 m from the ground.
Using the formula for vertical motion,
vf = u + gt,
where
vf = final velocity = 0 (since the kangaroo is at rest when it lands)u = initial velocity (when it is at rest = 0)g = acceleration due to gravity = -9.8 m/s² (negative since it is acting downwards)t = time taken for the jumpWe can substitute these values and gett = 0.5304 seconds
Therefore, the kangaroo was in the air for 0.5304 seconds.
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imagine swinging a ball in a circle at the end of a string. if the string that holds the ball breaks, what causes the ball to move in a straight line path?
When a ball is swung in a circle at the end of a string, it is constantly changing direction due to the force acting on it. This force is called the centripetal force, which is provided by the tension in the string.
When the string holding the ball breaks, there is no longer any force acting on the ball to keep it moving in a circular path. As a result, the ball moves in a straight line path in accordance with Newton's first law of motion, which states that an object at rest will remain at rest or an object in motion will continue to move in a straight line path at a constant speed unless acted upon by an external force.
In this case, the external force was the tension in the string, which was providing the centripetal force to keep the ball moving in a circular path. Once the string broke, the ball no longer experienced any centripetal force, and thus continued to move in a straight line path.
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Complete the following sentence.
A diameter is also a...
Answer:
A diameter is also a double of radius
Part A A canoe is designed to have very little drag when it moves along its length. Riley, mass 62 kg, sits in a 21 kg canoe in the middle of a lake. She dives into the water off the front of the canoe, along the axis of the canoe. She dives forward at 1.7 m/s relative to the boat. Just after her leap, how fast is she moving relative to the water? Express your answer with the appropriate units Value Units Submit Request Answer ▼ Part B Just after her leap, how fast is the canoe moving relative to the water? Express your answer with the appropriate units. (c)EValue Units
The speed of Riley relative to the water is 1.7 m/s. and the speed of canoe relative to the water is 0 m/s.
How fast is Riley moving relative to the water?The equation needed to solve the problem is the following:
Final Velocity = Initial Velocity + (Acceleration × Time)
The steps to solve for speed of Riley are the following:
Mass of Riley = 62 kg
Mass of canoe = 21 kg
Speed of leap relative to the boat = 1.7 m/s
By using the equation for conservation of momentum (also known as the center of mass formula):
m₁v₁ + m₂v₂ = (m₁ + m₂)vf
Solve for the unknown variable: vf = (m₁v₁ + m₂v₂) / (m₁ + m₂)
Plugging in the values given, you get: vf = (62 kg × 1.7 m/s) / (62 kg + 21 kg) = 1.2 m/s
Therefore, Riley is moving at 1.2 m/s relative to the water.
Velocity of the canoe relative to the water can be determined by using the equation for conservation of momentum (also known as the center of mass formula):
m₁v₁ + m₂v₂ = (m₁ + m₂)vf
v₂ = [(m₁ + m₂)vf - m₁v₂] / m₂
Plugging in the values given, you get: v₂ = [(62 kg + 21 kg) × 1.2 m/s - 62 kg × 1.7 m/s] / 21 kg = 0 m/s
Therefore, the canoe is not moving relative to the water.
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a tennis ball is dropped from 1.0 m, bounces off the ground, and rises to 0.85 m. what kind of collision occurred between the ball and the ground?
Answer:
Inelastic collision
Explanation:
In the question, it states that when the ball bounced off the ground, it lost 0.15m. This means that it yielded some kinetic energy. Which is an inelastic collision.
A piece of metal weighing 187.6 g is placed in a graduated cylinder containing 225.2 mL of water. The combined volume of solid and liquid is 250.3 mL. What is the density, in grams per milliliter, of the metal?
The density of the metal is 7.47 g/mL which can be calculated by dividing the mass (187.6 g) of the metal by its volume (250.3 mL).
The volume of the metal by using the displacement method.
When the metal is placed in the graduated cylinder containing water, the water level rises by a certain amount equal to the volume of the metal. Therefore, we can calculate the volume of the metal as follows:
Volume of metal = Volume of solid and liquid - Volume of liquid
Volume of metal = 250.3 mL - 225.2 mL
Volume of metal = 25.1 mL
Now that we have the volume of the metal, we can find its density as follows:
Density of metal = Mass of metal / Volume of metal
Density of metal = 187.6 g / 25.1 mL
Density of metal = 7.47 g/mL
Therefore, the density of the metal is 7.47 g/mL.
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the diagram below shows four cannons firing shells with different masses at different angles of elevation. the horizontal component of the shell's velocity is the same in all four cases. in which case will the shell have the greatest range if air resistance is neglected? (a) cannon a (b) cannon b only (c) cannon c only (d) cannon d
The diagram below shows four cannons firing shells with different masses at different angles of elevation. the horizontal component of the shell's velocity is the same in all four cases. The case will the shell have the greatest range if air resistance is neglected is (a) cannon a
The cannon which would have the maximum range if air resistance is neglected is given by the expression R = (V²/g)sin(2θ). The horizontal component of velocity is the same for all four shells, Vx = Vcosθ. Where R is the range, V is the velocity, g is the gravitational acceleration, θ is the angle of projection, and Vx is the horizontal component of the velocity. The diagram below shows four cannons firing shells with different masses at different angles of elevation.
For the maximum range, we need to take the angle of projection to be 45°. The mass of the shell is not a consideration since it doesn't affect the time of flight or the range of the shell.Therefore, the maximum range is given by the highest value of V²sin(2θ)/g. As sin(90) = 1, sin(0) = 0, sin(30) = 1/2, sin(45) = √2/2, sin(60) = √3/2, sin(70) = 0.94, the maximum value of sin(2θ) is obtained when θ = 45°.For all four cannons, the horizontal component of velocity, Vx = Vcosθ, is the same. Therefore, the maximum range is obtained for Cannon A when air resistance is neglected. Therefore, the correct answer is (a) Cannon A.
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The control surface of an aircraft is supported by a thrust bearing at point C and isactuated by a bar connected to point A. The 1 kN force acts in the negative z direction,and the line connecting points A and B is parallel to the z axis. Determine the value offorce F needed for equilibrium and all support reactions.
It takes 1.414 kN of force F to achieve equilibrium and all supporting processes.
What is Force?An external force is an agent that has the power to alter the resting or moving condition of a body. It has a trajectory and a magnitude. The application of force is the place at which force is applied, and the direction in which the force is applied is known as the direction of the force.
The force applied in the negative z direction, A and B are connected through the bar and C is the thrust bearing. Determine the value of force F needed for equilibrium and all support reactions.
Steps to find the value of force F required for equilibrium and all support reactions:
Firstly, the control surface of an aircraft is supported by a thrust bearing at point C and is actuated by a bar connected to point A. The 1 kN force acts in the negative z direction and the line connecting points A and B is parallel to the z-axis. We have to determine the value of the force F required for equilibrium and all support reactions.
There are three supports; at A, B, and C. Let's consider that RAB, RBC, and RCB are reactions at A, B, and C, respectively. There are two directions, one is positive and the other is negative.
In the next step, the upward direction is positive and the downward direction is negative. Sum of forces in the x-direction:F cosθ = 0 ⇒ F = 0. Sum of forces in the y-direction:F sinθ - 1000N = 0 ⇒ F sinθ = 1000NCosθ = 1 (as cos0° = 1)⇒ F = 1000N/sinθ⇒ F = 1000N/sin(90° - θ)⇒ F = 1000N/cosθ. For equilibrium, sum of moments about point C (Taking clockwise moment as negative):FC x 0.5 - RAB x 0.5 - RCB x 1 = 0RAB + RCB = FC.
Thus, the value of force F needed for equilibrium and all support reactions is 1.414 kN.
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Light of 630 nm wavelength illuminates two slits that are 0.25 mm apart. FIGURE EX33.5 shows the intensity pattern seen on a screen behind the slits. What is the distance to the screen?
The distance to the screen from the two slits is 4.0 meters
Distance is the total distance traveled by an object over a specific time interval.
The distance can be calculated using the equation d = λ/(2a), where
d is the distance to the screen, λ is the wavelength of the light (630 nm in this case), and a is the separation of the two slits (0.25 mm in this case).Plugging these values in, we get: d = 630 nm / (2 * 0.25 mm) = 4.0 m. The distance to the screen from the two slits is 4.0 meters, as seen in Figure EX33.5.
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The net force on a current loop whose face is perpendicular to a uniform magnetic field is zero, since contributions to the net force from opposite sides of the loop cancel. However, if the field varies in magnitude from one side of the loop to the other, then there can be a net force on the loop. Consider a square loop with sides whose length is a , located with one side at x=b in the xy plane (see the figure).(Figure 1) A magnetic field is directed along z , with a magnitude that varies with x according to B= B 0 (1− x /b )
If the current in the loop circulates counterclockwise (that is, the magnetic dipole moment of the loop is along the z axis), find an expression for the x , y , and z projections of the net force on the loop.
Express your answers in terms of the variables I , a , b , and B0
The net force on a current loop when its face is perpendicular to a varying magnetic field will not be zero.
The x, y, and z projections of the net force on the loop can be expressed in terms of the variables I, a, b, and B0.
For the x-component of the force, it can be expressed as:
Fx = I a B0 (2x/b^2)
For the y-component of the force, it can be expressed as:
Fy = 0
For the z-component of the force, it can be expressed as:
Fz = -I a B0 (1-x/b)
Where
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a 6.96 nc charge is located 1.90 m from a 3.86 nc point charge. find the magnitude of the electrostatic force, in nano newtons, nn, that one charge exerts on the other.
The magnitude of the electrostatic force, in nano newtons, nn, that one charge exerts on the other is 57.54 nN.
The question needs to find out the magnitude of the electrostatic force, in nano newtons (nn), that one charge exerts on the other. Let us understand the given data before starting the solution.
Given data:
Charge 1 (q1) = 6.96 nCCharge 2 (q2) = 3.86 nCDistance between charges (r) = 1.90 mFormula used:
We use Coulomb's law to find the electrostatic force between the two charges.
Coulomb's Law
F = (k*q1*q2)/r²
Where,
F is the force between the charges,q1 and q2 are the two charges separated by a distance r,k is the Coulomb constant which is equal to 9 x 10⁹ Nm²/C²Let us substitute the given values in the above formula.
F = (9 * 10⁹) * (6.96 * 10⁻⁹) * (3.86 * 10⁻⁹) / (1.90)²F = 57.54 nN (nano newtons)Therefore, the magnitude of the electrostatic force, in nano newtons, nn, that one charge exerts on the other is 57.54 nN.
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A geosynchronous Earth satellite is one that has an orbital period of precisely 1 day. Such orbits are useful for communication and weather observation because the satellite remains above the same point on Earth (provided it orbits in the equatorial plane in the same direction as Earth’s rotation). The ratio r3T2 for the moon is 1.01×1018km3y2. Calculate the radius of the orbit of such a satellite. All work must be shown for full credit. The choices are: 2.75x10E3 km; 1.96x10E4km; 1.40x10E5km; 1.00x10E6km.
The radius of the orbit of such a satellite will be about 1.40 × 10⁵ kilometers.
What is the radius of orbit?To calculate the radius of the orbit of a geosynchronous Earth satellite, we must use the equation:
r³T² = 1.01 × 10¹⁸ km³y²
where, r is the radius of the orbit and T is the orbital period of the satellite, which is 1 day. We can rearrange the equation to calculate r, giving us:
r = (1.01 × 10¹⁸km³y²)1/3/(1 day)2/3
To calculate the radius of the orbit, we need to convert the units of 1 day to seconds: 1 day = 86400 seconds. We can substitute this into the equation:
r = (1.01 × 10¹⁸km³y²)1/3/(86400 seconds)2/3
Finally, we can calculate the radius of the orbit: r = 1.40 × 10⁵ km
Therefore, the radius of the orbit will be about 1.40 × 10⁵ km.
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19. Which statement correctly describes a short circuit?
O A. Having a part with very low resistance keeps the circuit cooler, preventing
damage caused by overheating.
O B. Almost no current flows through a part of a circuit that has very low resistance
because it goes through the load.
O C. Almost all the current flows through a part of a parallel circuit with very low
resistance, instead of through the rest of the circuit.
O D. Having a part with very low resistance keeps circuit breakers and fuses from
opening the circuit
Answer:
.
C. Almost all the current flows through a part of a parallel circuit with very low resistance, instead of through the rest of the circuit.
i measure an emission line in the lab at 500.7 nm. the same line in a star (now being absorbed) has wavelength 502.8 nm. what can i say about this star? group of answer choices it has a large parallax it has unusually strong spectral lines it is moving away from me it is moving towards me
The star is moving away from you. This is indicated by the fact that the observed wavelength (502.8 nm) is longer than the laboratory wavelength (500.7 nm), which is consistent with the Doppler effect caused by the star moving away from the observer.
What is Doppler effect?
The Doppler effect, named after Austrian physicist Christian Doppler, is the change in frequency of a wave in relation to an observer who is moving relative to the wave source. It is commonly observed with sound waves, but can also occur with light waves and other types of waves. When the observer is moving towards the source of the wave, the frequency and wavelength appear to increase, resulting in a higher pitch. When the observer is moving away from the source of the wave, the frequency and wavelength appear to decrease, resulting in a lower pitch or longer wavelength.
What is wavelength?
Wavelength is the distance between two consecutive points in a wave that are in phase, or at the same point in their cycle. It is usually represented by the symbol lambda (λ) and is measured in units of distance, such as meters or nanometers.
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a boy coasts down a hill on a sled, reaching a level surface at the bottom with a speed of 7.2 m/s. if the coefficient of friction between the sled's runners and snow is 0.055 and the boy and sled together weigh 540 n, how far does the sled travel on the level surface before coming to rest?
The boy coasts down the hill on the sled and reaches a level surface with a speed of 7.2 m/s. The coefficient of friction between the sled's runners and the snow is 0.055, and the boy and sled together weigh 540 N. To determine how far the sled will travel on the level surface before coming to rest, we need to calculate the distance using the formula Distance = (Speed x Time) - (1/2 x Acceleration x Time2). We can determine the time it takes for the sled to come to rest using the equation Speed = (Friction x Normal Force) / Mass. So, Speed = (0.055 x 540N) / 540N = 0.055 m/s. Time = 7.2/0.055 = 130.9 seconds. We can then calculate the distance as Distance = (7.2 x 130.9) - (1/2 x 0.055 x 130.92) = 927.9 m. Therefore, the sled will travel 927.9 m before coming to rest.
The boy and sled weigh 540 N. A boy coasts down a hill on a sled, reaching a level surface at the bottom with a speed of 7.2 m/s. The coefficient of friction between the sled's runners and snow is 0.055. How far does the sled travel on the level surface before coming to rest?
The distance traveled by the sled on the level surface before coming to rest is 72.22 meters.
What is friction?
Friction is a force that opposes motion. It is the friction between the sled's runners and the snow that causes the sled to stop. The formula for frictional force is:f = μN where f is the frictional force, μ is the coefficient of friction, and N is the normal force, which is equal to the weight of the sled and boy since they are on a level surface. The normal force is given by: N = m*g where m is the mass of the sled and boy and g is the acceleration due to gravity, which is equal to 9.81 m/s^2.
How far does the sled travel on the level surface before coming to rest?
The sled will travel a certain distance, d, before it stops. The distance, d, is given by:d = (v^2 - u^2) / 2fwhere v is the final velocity, u is the initial velocity (which is 7.2 m/s), and f is the frictional force. The frictional force is f = μN = μmgSubstituting the given values:d = (7.2∧2 - 0∧2) / (2*0.055*540*9.81)d = 72.22 meters. Therefore, the sled will travel 72.22 meters on the level surface before coming to rest.
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If the change in internal energy = 1714J, specific
heat capacity = 49J/°C/kg, and mass = 38kg,
what is the temperature change experienced?
Give your answer to 2 decimal places.
Answer:
0.92°C
Explanation:
C = change in Q/m × change in T
so
change in T = change in Q/C ×m
C= 49
m= 38
change in Q= 1714
then
= 1714/49 × 38
= 1714/1862
= 0.92°C
rounded off to 2 d.p
When the price of radios decreases 5%, quantity demanded increases 5%. The price elasticity of demand for radios is ________ and total revenue from radio sales will ________.
Price elasticity of demand for radios is 1 and total revenue from radio sales will remain constant.
Price elasticity of demand is calculated as the percentage change in quantity demanded divided by the percentage change in price. Using this formula, we can calculate the price elasticity of demand for radios as follows:
Price elasticity of demand = (percentage change in quantity demanded) / (percentage change in price)
Given that when the price of radios decreases by 5%, quantity demanded increases by 5%.So, the percentage change in quantity demanded = 5% and the percentage change in price = -5%. (Because price has decreased by 5%.)Price elasticity of demand = (5% / -5%) = -1.The negative sign indicates that the demand is elastic. However, the question asks for a positive value, so we take the absolute value of -1.Price elasticity of demand = 1.
Therefore, the price elasticity of demand for radios is 1.When the price elasticity of demand is equal to 1, it means that the demand is unit elastic. This implies that the percentage change in quantity demanded is equal to the percentage change in price. If the price of radios decreases by 5% and the quantity demanded increases by 5%, it means that the total revenue from radio sales will remain constant. In other words, the increase in quantity demanded is exactly offset by the decrease in price, resulting in the same total revenue.
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you are designing a spacecraft to a giant planet. which planet is your spacecraft going to study, and what is it going to learn about the planet?
A spacecraft is a vehicle that can travel into space. The spacecraft can be used to study other planets, asteroids, and comets in our solar system. Spacecraft has the ability to collect data, take photographs, and make measurements about the planets and other space objects.
What can you learn about a planet?With a spacecraft, scientists can learn a lot about planets. Some of the things that can be learned include the following:
The chemical composition of the planet's surface and atmosphere.The geology of the planet, such as mountains, valleys, and other features.How the planet rotates, and how long it takes to complete one rotation.The planet's weather patterns and climate, such as temperature and wind speeds.The planet's magnetic field, and how it interacts with the solar wind.The planet's moons and rings, and how they interact with the planet.In conclusion, with a spacecraft, scientists can learn a lot about planets. Information about a planet can vary depending on the planet.
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what device is used to shunt transient current to ground in the event of an indirect lightning strike?
In the event of an indirect lightning strike, a Surge Protection Device (SPD) is used for shunting transient current to the ground. An SPD is a protective device that limits the voltage supplied to an electrical system by either blocking or shorting to ground any unwanted voltages above a safe threshold. This can help protect against damage from transient current, a short, high-energy burst of electricity.
A surge protector is an electrical device that protects electronic devices from power surges and other electrical disturbances. The device will shield the equipment that is plugged into it from the spikes that are present in an electrical supply.The term “surge protector” is frequently used in reference to a category of products that is also known as a “transient voltage suppressor.” This name provides insight into how these devices work. They suppress transient voltage, which is a sudden surge of voltage that is brief in nature
.How do surge protectors work?
Surge protectors work by preventing transient voltage spikes from reaching sensitive electrical equipment. These devices typically consist of a metal oxide varistor, which is a component that is used to divert any unwanted voltage away from sensitive electronics and toward a grounded element.The varistor is connected to a metal oxide varistor, which is responsible for conducting the unwanted voltage away from the equipment and toward the ground. Surge protectors will reduce voltage to a safe level by grounding the unwanted voltage. Surge protectors are used to protecting a wide range of electronic devices, including computers, audio equipment, and video equipment.
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Transient current refers to an electrical current that flows for a brief period. Transient currents are caused by temporary changes in voltage, such as those caused by electrical discharges, power outages, and other events. Surge currents are another name for transient currents, and they are often used interchangeably.
A lightning strike is an electrical discharge from the atmosphere to the earth's surface. Thunderstorms, which are associated with lightning, are the most frequent natural cause of the electrical discharge. A lightning bolt can produce extremely high voltages and currents, posing a significant threat to electrical systems and the people who operate them.
A surge protector is a device that is intended to protect electrical devices from voltage spikes, surges, and other power fluctuations. Surge protectors work by shunting transient currents to the ground in the event of an indirect lightning strike. They can also be used to safeguard against other types of power surges, such as those caused by power outages, grid switching, and other issues. Surge protectors are often utilized in industrial and commercial settings, as well as in homes.
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the velocity v of an earth satellite varies directly as the square root of its mass m, and inversely as the square root of its distance r from the center of earth. if the mass is halved and the distance is doubled, how is the speed affected
If the mass of the satellite is halved and the distance is doubled, the velocity of the satellite will be reduced to approximately 70.7% of its original value.
What is a satellite in this context?
In this context, a satellite refers to an artificial object that is launched into orbit around the Earth to perform various functions, such as communication, navigation, and scientific research.
Let's start by writing the equation that relates the velocity of the satellite with its mass and distance from the center of the earth:
v = k√(m/r)
where k is a constant of proportionality.
Now, if the mass is halved and the distance is doubled, we have:
v' = k√(m/2r)
where v' is the new velocity. We can use this equation to find how the velocity is affected by the changes:
v' = k√(m/2r) = k√(m/r) / √2
The square root of 2 is approximately 1.414, so we can simplify the expression to:
v' = v / 1.414
Therefore, if the mass of the satellite is halved and the distance is doubled, the velocity of the satellite will be reduced to approximately 70.7% of its original value.
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Using the heat of vaporization of benzene, 395 J/g, calculate the grams of benzene that will condense at its boiling point if 8.44 kJ is removed.
Considering the heat of vaporization of benzene, the mass that will evaporate, at the boiling point, if 8.44 kJ/g of heat is extracted is 21.36 g.
Given the heat of vaporization of benzene, 395 J/g and the heat removed, 8.44 kJ, we can determine the mass of benzene that condenses by converting the heat removed to J/g as follows:
Qv = 8.44 kJ/g · 1000 J / 1 kJ = 8440 J/g
Hence, mass of benzene that condenses can be found by dividing the heat removed by the heat of vaporization as shown:
mass = heat removed / heat of vaporization
m = 8440 J/g / 395 J/g
m = 21.36 g
Therefore, 21.39 g of benzene will condense at its boiling point if 8.44 kJ is removed.
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how much current must pass through a 400 turn coil 4.0 cm long to generate a 1.0-t magnetic field at the center? select one: a. 0.013 a b. 80 a c. 22 a d. 13 a e. 40 a
The amount of current that must pass through a 400 turn coil 4.0 cm long to generate a 1.0-t magnetic field at the center is 0.013A.
Ampere's law relates the current and magnetic field that circulates around the current. It is named after the French physicist André-Marie Ampère . Ampere's law states that the magnetic field (B) at any point along a closed loop of wire is proportional to the current (I) passing through the loop and inversely proportional to the distance (r) from the current-carrying wire to the point.
So, using Ampere's law, one can determine the magnetic field for any given current.
To calculate the current passing through a 400-turn coil, 4.0 cm long, that generates a 1.0 T magnetic field at the center:
We can use the formula of B = µ(0)NI/L.
Where,μ0 = permeability of free space,
N = number of turns,
I = current,
L = length.
We are given,µ0 = 4π × 10⁻⁷ TmA⁻¹, N = 400 turns, B = 1.0 T and L = 4.0 cm = 0.04 m.∴ 1.0 = 4π × 10⁻⁷ × 400 × I/0.04∴ I = 0.013 A or 13 mA.
Hence, the correct option is a) 0.013 A is the amount of current that must pass through a 400 turn coil 4.0 cm long to generate a 1.0-t magnetic field at the center.
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(Figure 1) shows a collision between three balls of clay. The three hit simultaneously and stick together. Assume that m = 60 g and v = 2.9 m/s. ⬤↘ m 40 m/s, and 45°
←⬤ v 30 g
↑
⬤ 20 g and 2.0 m/s
Part A What is the speed of the resulting blob of clay? Express your answer with the appropriate units. V = ? Part B What is the movement direction of the resulting blob of clay? Express your answer in degrees below the horizontal. θ = ?
The speed of the resulting blob of clay is 20.99 m/s and the direction is 45.82⁰ below the horizontal.
Given :
Masses of balls of clay:
m₁ = 60g,
m₂ =20g,
m₃ = 30g.
Speed of balls of clay :
v₁ = 40m/s,
v₂= 2m/s,
v₃ = 2.9m/s
we can write the speed in vector form as :
υ₁ = 40( x + y)/ √2 m/s,
υ₂ = 2 y m/s,
υ₃ = 2.9 (-y) m/s, where x and y are unit vectors in perpendicular directions.
During a collision, the momentum remains conserved. Hence using the conservation of total momentum we can calculate the final speed of the resulting bob clay.
Using conservation of momentum,
initial momentum = final momentum
m₁υ₁ + m₂υ₂ + m₃υ₃ = (m₁+m₂+m₂)υ,
where υ = final velocity of clay blob.
Putting all the values in the above equation,
60 × 40( x + y)/ √2 + 20×2 y+30 ×2.9 (-y) = (60+20+30) υ
on solving the above equation, we get
υ = 14.63 x + 15.06 y
The magnitude of the final speed will be equal to √(14.63²+ 15.06²)
Final speed= 20.99 m/s.
and
Angle = tan⁻(15.06/14.63)
Angle = 45.82⁰ below the horizontal.
Therefore, the speed of the resulting blob of clay is 20.99 m/s and the direction is 45.82⁰ below the horizontal.
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Complete the following statement: The sum of the magnitudes of the currents directed into a junction Select one: a. is divided equally among the number of lines directed out of the junction. b.equals the current that is directed along one of the lines out of the junction. c. is greater than the total current directed out of the junction. d. equals the sum of the magnitudes of the currents directed out of the junction.
By kirchoff rule ,The sum of the magnitudes of the currents directed into a junction equals the sum of the magnitudes of the currents directed out of the junction. Therefore, the correct option is d, which says that the sum of the magnitudes of the currents directed into a junction equals the sum of the magnitudes of the currents directed out of the junction.
How does a junction work?A junction is a point where two or more lines meet. The current flowing into the junction must be the same as the current flowing out of it. The current will divide into various branches at the junction. The sum of the current entering the junction equals the sum of the current exiting the junction. Therefore, the current through one branch must be subtracted from the current through the other branch when calculating the current through each branch.The law of conservation of charge says that charge is neither created nor destroyed. Thus, the sum of the charges that flow into a junction must equal the sum of the charges that flow out of it, according to Kirchhoff's junction rule.The Kirchhoff's junction rule states that the sum of the currents into a junction must equal the sum of the currents leaving the junction. When two or more resistors are connected in a circuit, they share the current flowing through the circuit in the same direction, and the current is split into two or more branches.
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A ball of mass, m is thrown straight up and rises h after leaving your hand, it momentarily stops. Acceleration due to gravity g is downward. Ignore air resistance. Part A (5 points): If the ball is the system, and the Earth is the surroundings, what is the change in potential energy, ΔUsys of the system, and what is the work done, Wsurr by the surroundings ? Δ Usys = 0; Wsurr = -mgh Δ Usys = mgh; Wsurr = -mgh Δ Usys = mgh; Wsurr = 0 Δ Usys = 0; Wsurr = 0 Δ Usys = -mgh; Wsurr = 0
the correct answer is option (C). If the ball is the system, and the Earth is the surroundings, the change in potential energy, ΔUsys of the system is mgh, and the work done, Wsurr by the surroundings is 0. Therefore.
In this case, the ball is hurled straight up, reaching a height of h before briefly coming to a stop. We assume the ball to be the system and the Earth to be the surroundings in order to calculate the change in potential energy of the system and the work performed by the surroundings. The system's change in potential energy is mgh because the ball's gravitational potential energy grows as it ascends to a height of h. Yet, because the environment is not subjected to any labour from the ball during its rise and descent, there is no work done by the environment.
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the sun is shining on james and has created a shadow that is 8 feet long what is the distance from his head to his shadow
The distance from James's head to his 8-foot long shadow is 8 feet.
To find this, we can use the simple triangle relationship: opposite side (the shadow) is equal to the hypotenuse (the distance between James's head and his shadow) times the cosine of the angle formed by the sun's rays.
The distance from James's head to his shadow can be calculated using trigonometry. The tangent function can be used for this purpose.
To calculate the distance from James's head to his shadow, follow these steps:
Firstly, draw a right triangle with one of its angles adjacent to James's head and the other adjacent to the base of the shadow. The hypotenuse of the triangle is the line between James's head and the tip of the shadow.
Let x be the distance from James's head to the base of the shadow. The hypotenuse is the square root of (x^2 + 8^2).
Use the tangent function to find the value of x. tan(angle) = opposite/adjacent. In this case, the angle is the angle of elevation of the sun, which can be determined from the time of day and the location.
If the angle is not known, it can be assumed to be 45 degrees. tan(45) = opposite/adjacent.
The opposite side is 8, so: x = 8/tan(45) = 8/1 = 8 feet.
Therefore, the distance from James's head to his shadow is 8 feet.
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what happens to the domains of an object when it becomes magnetized?
When an object becomes magnetized, the domains within the object align themselves in a particular direction. A domain is a small region within a magnetic material that behaves like a tiny magnet, with its own north and south poles.
In an unmagnetized object, these domains are randomly oriented, so their magnetic fields cancel each other out and the material as a whole has no net magnetic field. When an external magnetic field is applied to the material, the magnetic domains become aligned with the external field, resulting in a net magnetic field for the material. If the external field is strong enough, it can overcome the random orientation of the domains and cause them to align in the direction of the external field. Once the domains are aligned, the object will retain its magnetism even after the external magnetic field is removed. This is because the domains will remain in their aligned state until another external magnetic field is applied to the object and causes them to realign.
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Which statement is true of both coal-fired power plants and solar thermal power plants?
A Both coal and solar thermal plants utilize renewable resources.
B Both coal and solar thermal plants convert the same percentage of initial energy into electricity .
C Both coal and solar thermal plants use a heat source to create steam
D Both coal and solar thermal plants create greenhouse gases
Answer:
Option C is the correct statement.
Explanation:
Both coal-fired power plants and solar thermal power plants use a heat source to create steam, which then drives a turbine to generate electricity. In a coal-fired power plant, the heat is generated by burning coal to produce steam. In a solar thermal power plant, mirrors or lenses are used to concentrate sunlight onto a fluid, which is then heated to produce steam.
Option A is incorrect because coal is a non-renewable resource, while solar thermal power plants utilize renewable solar energy. Option B is incorrect because the conversion efficiency of coal-fired power plants is typically much lower than that of solar thermal power plants. Option D is partially correct, as coal-fired power plants are a major source of greenhouse gas emissions, while solar thermal power plants do not emit greenhouse gases during operation.
Alice holds a small battery operated device used for tuning instruments that emits the frequency of middle C (262 Hz) while walking with a constant speed of 4.68 m/s toward a building which presents a hard smooth surface and hence reflects sound well. (Use343 m/s as the speed of sound in air.)
(a) Determine the beat frequency Alice observes between the device and its echo. (Enter your answer to at least 1 decimal place.)
(b) Determine how fast Alice must walk away from the building in order to observe a beat frequency of 6.19 Hz.
(A) Alice observes a beat frequency of approximately 3.9 Hz between the device and its echo. (B) Alice must walk away from the building at a speed of approximately 7.05 m/s to observe a beat frequency of 6.19 Hz.
(A) The given values are:
Speed of Alice, vA = 4.68 m/s.
The frequency emitted by the device, f1 = 262 Hz
Speed of sound in air, v = 343 m/s(a)
The beat frequency, f beat is given by the formula: fbeat = |f1 - f2| where f2 is the frequency of the reflected sound.
Since the speed of sound is reflected, the distance traveled by the sound to the building and back is 2d.
Therefore, the time taken is given by t = 2d/v.
The frequency f2 is given by f2 = v/(2d).
The distance d = vt/2 = (vA t)/2
The time t is given by: t = d/vA
The frequency f2 is given by f2 = v/(2d) = vA/(2v t)
Therefore, the beat frequency is: fbeat = |f1 - f2| = |262 - vA/(2v t)|
Thus, substituting the given values, we get: fbeat = |262 - 343/(2 × 4.68 × t)|
To solve this, we can use trial and error method.
We can check if fbeat is approximately equal to 2, 3, 4, 5, or 6 Hz.
Using t = 0.01 s, we get: fbeat = |262 - 343/(2 × 4.68 × 0.01)|≈ 4.4 Hz
Using t = 0.011 s, we get: fbeat = |262 - 343/(2 × 4.68 × 0.011)|≈ 3.9 Hz
Therefore, Alice observes a beat frequency of approximately 3.9 Hz between the device and its echo.
(b) Let's suppose that Alice walks with a velocity of vA' away from the building. Therefore, the distance traveled by the sound in the same time interval t = d/vA' is d' = vA' t/2.The time taken is given by t = d/vA = d'/vA'
Now, the frequency f2 is given by f2 = v/(2d') = vA'/(2v t)
The beat frequency is:fbeat = |f1 - f2| = |262 - vA'/(2v t)|
Thus, substituting the given values, we get: fbeat = |262 - 343/(2 × vA' × t)|
Let's suppose that fbeat = 6.19 Hz.
Using trial and error, we get that t ≈ 0.018 s.
Substituting this value, we get:6.19 = |262 - 343/(2 × vA' × 0.018)|
Therefore, vA' ≈ 7.05 m/s
Thus, Alice must walk away from the building at a speed of approximately 7.05 m/s to observe a beat frequency of 6.19 Hz.
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The temperature of a gas stream is to be measured by a thermocouple whose junction can beapproximated as a 1.2-mm-diameter sphere. The properties of the junction are k =35 W/m °C, p=8500kg/m3, and Cp = 320 J/kg °C, and the heat transfer coefficient between the junction and the gas is h=65W/m2 °C. Determine how long it will take for the thermocouple to read 99 percent of the initialtemperature difference. (∅/∅i= 0.01)
it will take 30.65 minutes for the thermocouple to read 99 percent of the initial temperature difference. (∅/∅i = 0.01).
The temperature of a gas stream is to be measured by a thermocouple whose junction can be approximated as a 1.2-mm-diameter sphere. So, the radius, r = 0.6 mm = 0.0006 m, the volume of the sphere, V = (4/3)πr³, and the area of the sphere, A = 4πr².
The properties of the junction are k = 35 W/m °C, p = 8500 kg/m³, and Cp = 320 J/kg °C, and the heat transfer coefficient between the junction and the gas is h = 65 W/m² °C.
We have, thermal conductivity of the sphere = k = 35 W/m °C, density of the sphere = p = 8500 kg/m³, specific heat of the sphere = Cp = 320 J/kg °C, and heat transfer coefficient between the sphere and the gas, h = 65 W/m² °C.
The initial temperature difference is given by, ΔT₀ = 1°C = 1 K. Let, the time taken for the thermocouple to read 99% of the initial temperature difference, ΔT99 = 0.99 K.
Let, the thermal diffusivity of the sphere be,
α = k / (pCp) = (35 W/m °C) / (8500 kg/m³ x 320 J/kg °C) = 0.000012868 m²/s.
And, the Biot number is given by, Bi = (h x A) / k = [(65 W/m² °C) x 4π(0.0006 m)²] / (35 W/m °C) = 0.0492.
The equation for the unsteady-state temperature profile of a sphere is, θ(r,t) = Σ [(-1)n+1 / n] exp(-n²π²αt / r²) sin (nπr / R), where R is the radius of the sphere. We can estimate the time taken for the thermocouple to read 99% of the initial temperature difference using a semi-log plot of θ/ΔT vs. t/ti.
This plot is linear and of the form, θ/ΔT = 1 - A exp (-Bt/ti), where A = 0.01 and B = (nπ/R)².So, θ/ΔT = 0.99 = 1 - A exp (-Bt/ti), or 0.01 exp (-Bt/ti) = 0.01/0.99, or exp (-Bt/ti) = 1/99, or -Bt/ti = ln (1/99), or t/ti = ln (99).
Therefore, the time taken for the thermocouple to read 99% of the initial temperature difference is, ti = t / ln (99) = (0.000012868 m²/s) (0.6 mm)² / (35 W/m °C) ln (99) = 1838.98 s or 30.65 minutes.
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if we are going to put a 36,000 btu/hr water heater and 120,000 furnace btu/hr ( both cat i appliances) in mechanical room that is 10' x 10' x 10' in size, what is the volume of space in the mechanical room?
The volume of the mechanical room is 1000 cubic feet
To calculate the volume of space in a mechanical room, given that a 36,000 btu/hr water heater and 120,000 furnace btu/hr (both cat i appliances) will be installed in a 10' x 10' x 10' room size, use the following formula:
Volume = Room Length x Room Width x Room Height
The volume of space in the mechanical room is given as follows:
Volume = 10' x 10' x 10'
Volume = 1000 cubic feet (cu ft)
Therefore, the volume of space in the mechanical room is 1000 cubic feet (cu ft).
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