A 1200-turn coil of wire that is 2. 3 cm in diameter is in a magnetic field that drops from 0. 13 T to 0 T in 12 ms. The axis of the coil is parallel to the field. What is the emf of the coil? Express your answer using two significant figures
Answers
In a magnetic field that decreases from 0. 13 T to 0 T in 12 ms, a wire coil with 1200-turns and a 2. 3 cm diameter is placed. The coil's axis is perpendicular to the field. The coil's emf is 0.059 V.
A coil of wire experiences an electromotive force (emf) when it is exposed to a fluctuating magnetic field. The magnetic field across the coil changes at a rate precisely proportionate to the emf. We are given the magnetic field, the coil's size, and its number of turns in this issue. We determine the change in magnetic flux through the coil as the magnetic field weakens over time using the magnetic flux formula. Lastly, we determine the induced emf in the coil using the emf formula. The response, 0.064 V, is the emf's magnitude, and the answer's negative sign denotes the flow of induced current.
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Related Questions
An apple fell 6.0 m from a tree to the ground. What additional information is needed to calculate both the gravitational potential energy of the apple and its kinetic energy?
the volume of the apple and the time the apple was in the air
the mass of the apple and the amount of energy lost to air resistance
the average acceleration of the apple and the time the apple was in the air
the average velocity of the apple and the amount of energy lost to friction
Answers
For calculation of potential energy mass of the apple , average acceleration of the apple and height of apple is required.
Energy While for calculation of kinetic energy volume of the apple and time the apple was in air, the average velocity of the apple and amount of energy lost to friction is required.Based on the force exerted on the two objects, the potential energy equation is determined. P.E. = mgh, where m is the mass in kilograms, g is the acceleration caused by gravity (9.8 m/s2 at the earth's surface), and h is the height in meters, is the formula for gravitational force.The relationship between kinetic energy and an object's mass and squared velocity is given by K.E. = 1/2 m v2. If the mass is measured in kilograms and the speed is measured in meters per second, the kinetic energy is measured in kilogram-meters squared per second squared.For more information on kinetic and potential energy kindly visit to
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as noted in this chapter, plants help to reduce water runoff and soil erosion, both of which affect the health of streams and rivers by impacting water quality. soil erosion increases the silt load in water and this literally smothers living organisms, particularly plants and invertebrate species. runoff water can carry pollutants, particularly pesticides and herbicides from agricultural land. read the description of each landscape and rank them from best stream quality to worst stream quality. 1: streams cutting through small farms with several different crop types and natural vegetation buffers between the fields and the streams. 2: a large floodplain area covered with lowland forests and swamps full of emergent vegetation, with small streams cutting through the area. 3: an urban housing development where the trees growing along the streams were removed and replaced with lawns. 4: a system of large farms with no buffer vegetation between the fields and the streams that cut through the farms. question list (4 items) (drag and drop into the appropriate area) landscape 1 landscape 2 landscape 3 landscape 4 correct answer list best stream quality
Answers
Plants help to reduce water runoff and soil erosion, both of which affect the health of streams and rivers by impacting water quality.
Soil erosion increases the silt load in the water, which can smother living organisms, particularly plants and invertebrate species. Runoff water can carry pollutants, particularly pesticides, and herbicides from agricultural land.
Landscape 1 (streams cutting through small farms with a variety of crop types and natural vegetation buffers between the fields and the streams) would be the best quality, followed by Landscape 2 (a large floodplain area covered in lowland forests and swamps full of emergent vegetation, with small streams cutting through the area) and Landscape 3 (an urban housing development where the streams are surrounded by emergent vegetation).
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g as a prank, someone drops a water-filled balloon out of a window. the balloon is released from rest at a height of 10.0 m above the ears of a man who is the target. then, because of a guilty conscience, the prankster shouts a warning after the balloon is released. the warning will do no good, however, if shouted after the balloon reaches a certain point, even if the man could react infinitely quickly. assuming that the air temperature is 20 c and ignoring the effect of air resistance on the balloon, determine how far above the man's ears this point is.
Answers
The point at which the warning will do no good is 7.50 m above the man's ears.
When a water-filled balloon is released from rest at a height of 10.0 m above the ears of a man, the warning will do no good if shouted after the balloon reaches a certain point. Assuming that the air temperature is 20°C and ignoring the effect of air resistance, this point is 7.50 m above the man's ears.
The vertical displacement (d) can be determined using the equation [tex]d = \frac{vf2}{2g}[/tex], where vf is the final velocity and g is the acceleration due to gravity (9.81 m/s2).
Since the balloon was released from rest, the initial velocity is 0 m/s. Therefore, [tex]d = \frac{02 }{ 2} (\frac{9.81 m}{s2} ) = 0[/tex]m. Since the initial height was 10.0 m, the final height is 10.0 m + 0 m = 10.0 m.
The point at which the warning will do no good is 7.50 m above the man's ears, so the final height of the balloon must be 10.0 m - 7.50 m = 2.50 m.
Therefore, the point at which the warning will do no good is 7.50 m above the man's ears.
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1 80 kg scaffold is 5.80 m long. it is hanging with two wires, one from each end. a 580 kg box sits 1 m from the left end. what is the tension in the right hand side wire?
Answers
The tension in the right-hand side wire is 6525 N.
Given:
Weight of the scaffold = 180 kgLength of the scaffold = 5.8 mWeight of the box = 580 kgDistance of the box from left end = 1 mLet the tension in the left wire = T1Let the tension in the right wire = T2To find: Tension in the right-hand side wireWe know that the sum of forces acting in a vertical direction should be equal to 0 as there is no acceleration in the vertical direction. ∑Fv = 0In the horizontal direction, there are no forces acting on the system.
∑Fh = 0Now considering forces in the vertical direction: T1 + T2 = (Weight of scaffold + Weight of the box) gT1 + T2 = (180 + 580) x 9.8T1 + T2 = 7644 N1. From the diagram, we can see that the box is nearer to the left side. Hence, the tension force in the left wire is greater than the tension force in the right wire.
T1 > T22. Let's take moments about the right end of the scaffold as shown in the figure below.
∑Mr = 0T1 × 5.8 = T2 × 1T2 = 5.8/1 × T1T2 = 5.8T1Now, we can substitute the value of T2 in equation (1):
T1 + T2 = 7644N6.8 T1 = 7644 N T1 = 1125 NTo find T2, we can substitute the value of T1 in equation (2):
T2 = 5.8 × T1T2 = 5.8 × 1125 N T2 = 6525 NTherefore, the tension in the right-hand side wire is 6525 N.
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A copper water tank of mass 20 kg contains 150 kg of water at 15°C. Calculate the energy needed to heat the water and the tanks to 55°C
Answers
The energy needed to heat the water and the copper tank to 55°C is 25,083,080 J.
Q = mCΔT
m = 150 kg (mass of water)
C = 4.18 J/g°C (specific heat capacity of water)
ΔT = 55°C - 15°C = 40°C (change in temperature)
Using the formula, we get:
[tex]Q_{water}[/tex] = mCΔT
[tex]Q_{water}[/tex] = (150 kg) x (4.18 J/g°C) x (40°C)
[tex]Q_{water}[/tex] = 25,080,000 J
m = 20 kg (mass of tank)
C = 0.385 J/g°C (specific heat capacity of copper)
ΔT = 55°C - 15°C = 40°C (change in temperature)
Using the formula, we get:
[tex]Q_{tank}[/tex] = mCΔT
[tex]Q_{tank}[/tex] = (20 kg) x (0.385 J/g°C) x (40°C)
[tex]Q_{tank}[/tex]= 3080 J
Finally, we can add the two energies together to get the total energy needed:
[tex]Q_{total}[/tex] = [tex]Q_{water}[/tex] [tex]+[/tex] [tex]Q_{tank}[/tex]
[tex]Q_{total}[/tex] [tex]= 25,080,000 J + 3080 J[/tex]
[tex]Q_{total}[/tex] [tex]= 25,083,080 J[/tex]
Energy is a fundamental concept that refers to the ability of a physical system to do work or cause a change. It is a scalar quantity that is measured in units of joules (J) in the International System of Units (SI). According to the law of conservation of energy, energy cannot be created or destroyed, but it can be transformed from one form to another. This means that the total amount of energy in a closed system remains constant.
Energy is a crucial concept in many areas of physics, including mechanics, thermodynamics, and electromagnetism. Understanding energy is essential for understanding how the physical world works, and it has numerous applications in technology and everyday life, from powering our homes and vehicles to the production of food and the functioning of our bodies.
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the potential difference across the ion channel is 70 mv . what is the power dissipation in the channel?
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The power dissipation in the ion channel is 4.9 mW given that the potential difference across the ion channel is 70 mv
The power dissipated by a resistor is given by the formula:P = V² / RwhereP = PowerV = VoltageR = Resistance
The power dissipated in the ion channel is unknown. However, we can consider the ion channel to have a resistance of 1 Ω. This is because the resistance of an ion channel is very small and close to zero. So, we can assume the resistance of the ion channel as 1 Ω.As we know the potential difference across the ion channel, we can use the above formula to find the power dissipated in the ion channel.P = (70 mV)² / 1 ΩP = 0.0049 W = 4.9 mW
Therefore, the power dissipation in the ion channel is 4.9 mW.
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Imagine you are viewing the other planets from Earth. Which planets (if any) will appear to pass directly in front of the Sun from your Earth-based perspective? Which planets (if any) will never transit the Sun? If you were able to view the Solar System from outside, how many planets could potentially transit the Sun? Will those planets transit the Sun no matter where outside the Solar System you are? Sketch and describe the required orientation of the Solar System in order for the maximum number of planets to transit the Sun.
Answers
Explanation:
Planets closer to the sun will appear to transit from time to time
= 2 Venus and Mercury ( I suppose you could include the Moon..an eclipse ....haha)
All of the planets further from the sun than earth will not transit
Potentially ALL of the planets could transit the sun (earth included) if observed outside solar system HOWEVER if you are not observing from near the orbital plane of
the planets NONE of them would transit
For maximum transits, the planets should all be in the same orbital plane and the observer should be very close to this plane also.
A train P covered a distance of 180 km in 4.5 hours and train Q covered 270 km in 6 hours. Which train is moving faster?
Answers
ans= train Q
Sol= 4.5×60= 270
6×60= 360
270÷180=1.5
360÷270=1.3...
1.3... <1.5
Proton 1 moves with a speed v from the east coast to the west coast in the continental United States; proton 2 moves with the same speed from the southern United States toward Canada. Is the magnitude of the magnetic force experienced by proton 2 greater than, less than, or equal to the force experienced by proton 1? O greater than the force experienced by proton 1 O less than the force experienced by proton 1 equal to the force experienced by proton 1
Answers
The magnitude of the magnetic force experienced by proton 2 will be less than the force experienced by proton 1. This is because the force experienced by a proton is related to the direction of its motion relative to the direction of the magnetic field.
As proton 1 is travelling from east to west, its motion is parallel to the magnetic field, which is aligned in a north-south direction in the continental United States. This means that proton 1 will experience a greater force due to the magnetic field than proton 2, which is travelling in a north-south direction and thus has a motion perpendicular to the magnetic field.
To understand this more clearly, we can consider the equation for the magnetic force:
F = qvB sin θ.
In this equation, the force experienced by a particle is related to the charge (q), velocity (v), and magnetic field strength (B). The sine of the angle between the velocity and magnetic field (θ) is also important as it determines how much of the force will be experienced by the particle. As proton 1's motion is parallel to the magnetic field, it will experience the full force due to the magnetic field, whereas proton 2's motion is perpendicular to the magnetic field and it will only experience a fraction of the force. The magnitude of the force experienced by proton 2 will be lower than the force experienced by proton 1.
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The velocity of a particle moving along the x axis changes from vi to vs For which values of vi and vf is the total work done on the particle positive? vi = 5 m / s, vf = - 2 m / s vi = - 2 m / s, vf = - 5 m / s vi = 5 m / s, vf = 2 m / s vi = - 5 m / s, vf = - 2 m / s vi = - 5 m / s, vf = 2 m / s
Answers
The total work done on a particle is given by the formula:
W = (1/2)mvf^2 - (1/2)mvi^2
where m is the mass of the particle, vi is the initial velocity, and vf is the final velocity.
For vi = 5 m/s and vf = 2 m/s, the final velocity is less than the initial velocity, so the total work is positive.
For vi = -2 m/s and vf = -5 m/s, the final velocity is less than the initial velocity, so the total work is positive.
For vi = -5 m/s and vf = 2 m/s, the final velocity is greater than the initial velocity, so the total work is negative.
For vi = 5 m/s and vf = -2 m/s, the final velocity is greater than the initial velocity, so the total work is negative.
For vi = -5 m/s and vf = -2 m/s, the final velocity is less than the initial velocity, so the total work is positive.
Therefore, the total work done on the particle is positive for vi = 5 m/s and vf = 2 m/s, and for vi = -2 m/s and vf = -5 m/s.
What works ?In order for work to be done, there must be a displacement of the object in the direction of the force applied. If the force and displacement are perpendicular, then no work is done.
Work can be positive, negative, or zero, depending on the direction of the force and the displacement. Positive work is done when the force and the displacement are in the same direction, negative work is done when they are in opposite directions, and zero work is done when there is no displacement or when the force and displacement are perpendicular.
Work is a transfer of energy, and as such it can change the kinetic energy, potential energy, or both of an object.
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Which of the following statements is true about the relationship between the two forms of Newton's second law (Fnet = dp/dt and Fnet = m.a) Select the correct answer
a. Fnet = dp/dt reduces to Fnet = m.a if the O acceleration of the object does not change with time. b. Fnet = m.a reduces to Fnet = dp/dt if the acceleration of the object does not change with time. c. Fnet = m.a reduces to Fnet = dp/dt if the mass of the object Answer dt does not change with time. d. Fnet = m.a reduces to Fnet = m.a if the dt momentum of the object does not change with time. e. Fnet = dp/dt reduces to Fnet = m.a if the mass of the object does not change with time. f. Fnet = m.a reduces to Fnet = dp/dt if the momentum of the object does not change with time.
Answers
The correct statement about the relationship between the two forms of Newton's second law (Fnet = dp/dt and Fnet = m.a) is option D "Fnet = m.a reduces to Fnet = dp/dt if the momentum of the object does not change with time.
What is Newton's second law?Newton's second law of motion states that the acceleration of an object is directly proportional to the force applied to it and inversely proportional to its mass. In other words, Fnet = m.a, where Fnet is the net force acting on an object, m is its mass, and a is its acceleration. This law can also be written as Fnet = dp/dt, where dp/dt is the rate of change of momentum with time.
Since momentum is the product of mass and velocity, it can be rewritten as dp/dt = m.dv/dt + v.dm/dt, where v is the velocity of the object. If the mass of the object remains constant over time, then v.dm/dt is zero and dp/dt reduces to m.dv/dt, which is equal to Fnet.
Therefore, Fnet = dp/dt reduces to Fnet = m.a if the object's acceleration does not change with time. If the momentum of the object does not change with time, then dp/dt is zero, and Fnet = dp/dt reduces to zero, which means that Fnet = m.a is also zero. Therefore, Fnet = m.a reduces to Fnet = dp/dt if the momentum of the object does not change with time.
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In a P-N-P transistor application, the solid state device is turned on when the
base is negative with respect to the emitter.
A P-N-P transistor conducts between the emitter and collector (is turned on) when a small amount of current flows into the base. This current flows when the emitter-base junction is forward biased. It is forward biased when the base is negative with respect to the emitter.
Answers
A P-N-P transistor is turned on when the base is negative with respect to the emitter.
How the transistor is turned on when the base is negative with respect to the emitterThe operation of a P-N-P transistor is based on the principle of a semiconductor diode. When a small current is applied to the base, it causes a larger current to flow through the emitter and collector. This is because the base-emitter junction is forward-biased, allowing electrons to flow from the emitter to the base. At the same time, the collector-base junction is reverse-biased, allowing holes to flow from the base to the collector.
This flow of electrons and holes produces a current gain. The amount of current gain depends on the type of transistor and the amount of current applied to the base.
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two forces are applied to a 12 kg cart on a frictionless surface as shown. at a certain instant, force a is 77 n to the right, and force b is 15 n to the left. what is the acceleration of the cart at this instant, in m/s2?
Answers
The acceleration of the cart at this instant is calculated to be 5.17 m/s² to the right.
What is Newton's second law?Newton's second law explains that acceleration of any object is directly related to net force and inversely related to the mass.
To determine the acceleration of the cart, we need to calculate the net force acting on it.
The net force is the vector sum of the two forces:
Net force = Force a + Force b = 77 N to the right - 15 N to the left = 62 N to the right
Using Newton's second law, F = ma, where F is the net force and m is the mass of the cart, we can calculate the acceleration:
a = F/m = 62 N / 12 kg = 5.17 m/s
Therefore, the acceleration of the cart at this instant is 5.17 m/s² to the right.
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Imagine another solar system, with a star of the same mass as the Sun. Suppose a planet with a mass twice that of Earth (2MEarth) orbits at a distance of 1 AU from the star. What is the orbital period of this planet? Hint: Think about how the mass of the Sun compares with the mass of the Earth. a. 3 months b. 6 months
c. 1 year d. 2 years
e. It would not be able to orbit at this distance.
Answers
The correct answer is option D.2 years
What is Kepler's third law of planetary motion?According to Kepler's Third Law of Planetary Motion, T² is proportional to r³, where T is the period of revolution of the planet and r is the distance between the planet and the star.
In order to solve for T,
AU = 1
Astronomical Unit = the average distance between the Earth and the Sun = 149.6 million kilometres
Therefore, the planet is orbiting at a distance of 149.6 million kilometres from the star.
Substituting the values of r and solving for
T².T² ∝ r³T² ∝ (149.6)³T²
= (149.6)³T²
= 3.522 x 10¹²T
= √3.522 x 10^¹²T
= 1.87 x 10⁶ seconds
T = 31,100 minutes
T = 518 hours
T = 21.6 days
T = 2 years
Therefore, the orbital period of the planet with twice the mass of Earth orbiting at a distance of 1 AU from a star with the same mass as the Sun is 2 years.
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standard number of bones in the appendicular skeleton
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The standard number of bones in the appendicular skeleton varies slightly among individuals, but it is generally accepted that there are 126 bones in the appendicular skeleton of an adult human.
The appendicular skeleton includes all the bones that are attached to the axial skeleton, which includes the skull, vertebrae, and ribcage. The appendicular skeleton consists of the bones of the arms, legs, pelvis, and shoulder girdle. Here is a breakdown of the number of bones in each part of the appendicular skeleton: Arms: 60 bones (30 in each arm) Legs: 60 bones (30 in each leg) Pelvis: 2 bones Shoulder girdle: 4 bones Adding up these numbers gives a total of 126 bones in the appendicular skeleton. However, this number can vary slightly among individuals due to differences in bone structure and development.
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please help!!
If an object were in motion, how might you use a magnet to change the direction of its motion? Diagram the setup and explain your reasoning.
Answers
If the object in motion has some magnetic properties or contains a magnet, we can use another magnet to change its direction of motion by exerting a force on it through magnetic interaction. This principle is known as the Lorentz force.
Here's how we can set up the experiment:
Take a magnet and place it on a flat surface.
Take another magnet or the object with magnetic properties that is in motion.
Hold the magnet or the object in your hand and bring it close to the stationary magnet without touching it.
Move the magnet or the object towards the stationary magnet and observe its behavior.
If the magnet or the object has the same polarity as the stationary magnet, they will repel each other, and the motion of the object will be deflected in a direction away from the stationary magnet. If the magnet or the object has opposite polarity to the stationary magnet, they will attract each other, and the motion of the object will be deflected in a direction towards the stationary magnet.
Here's a diagram to help you visualize the setup:
N S N S
__________ __________
| | | |
| M1 | | M2 |
|__________| |__________|
( ) ( )
| |
Motion Stationary
Object Magnet
In this diagram, M1 represents the motion object or magnet, and M2 represents the stationary magnet. The N and S represent the North and South poles of the magnets. The arrows indicate the direction of motion and the direction of the magnetic field.
As we move M1 towards M2, the magnetic interaction will exert a force on M1, causing it to change its direction of motion. The direction of deflection will depend on the polarity of the magnets.
Note: It's important to keep in mind that the magnetic force is only one of the many factors that can affect the motion of an object. Other factors such as friction, air resistance, and gravitational forces can also play a significant role.
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Which of the following characterizes the Kuiper belt?
A. It is a disk-like region between the outer planets and the Oort cloud.
B. It is up to 100,000 AU in size and spherical in shape.
C. It lies between the orbits of Mars and Jupiter.
D. It is a stable region just ahead of Jupiter in its orbit.
E. It is the region occupied by the Earth-crossing Apollo asteroids.
Answers
The Kuiper belt is a disk-like region between the outer planets and the Oort cloud. Thus, option A is correct
The Kuiper belt, also known as the trans-Neptunian region, is a doughnut-shaped region of space beyond Neptune that is home to an estimated 100,000 tiny, icy objects.
It is named after Dutch-American astronomer Gerard Kuiper, who first proposed its existence in 1951.
The belt ranges in distance from 30 to 50 astronomical units (AU) from the Sun, which is about 2.8 to 4.7 billion miles away.
The Kuiper belt objects are believed to be remnants from the formation of the solar system. They are small and mostly made up of ice and dust, similar to comets.
Some Kuiper belt objects, such as Pluto and Eris, are classified as dwarf planets.
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for a given mass of gas at constant temperature, the volume of the gas varies inversely with pressure.a. 3Pb. P/3c. 3P/Td. 9P
Answers
The volume of the gas varies inversely with pressure, and the correct answer is (b) P/3.
According to Boyle's Law, at a constant temperature, the volume of a gas is inversely proportional to its pressure. Mathematically, this can be expressed as:
PV = k
where P is the pressure of the gas, V is its volume, and k is a constant.
If we assume that the mass of the gas remains constant, then k is also constant. So we can write:
[tex]P_1V_1 = k and P_2V_2 = k[/tex]
where[tex]P_1 and V_1[/tex] are the initial pressure and volume, and [tex]P_2 and V_2[/tex] are the final pressure and volume.
If we divide these two equations, we get:
[tex]P_1V_1/P_2V_2 = 1[/tex]
Since[tex]V_1[/tex] is inversely proportional to [tex]P_1[/tex], we can write:
[tex]V_1 = k/P_1[/tex]
Similarly, [tex]V_2 = k/P_2.[/tex]
Substituting these values in the above equation, we get:
[tex](k/P_1)/(k/P_2) = 1[/tex]
Simplifying this, we get:
[tex]P_2/P_1 = V_1/V_2[/tex]
Since we are given that the temperature remains constant, we can assume that k is constant, and therefore:
[tex]V_1/P_1 = V_2/P_2[/tex]
If we let [tex]P_2 = 3P_1[/tex], then we get:
[tex]V_1/P_1 = V_2/(3P_1)[/tex]
Simplifying this, we get:
[tex]V_1/V_2 = 1/3[/tex]
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A converging lens of focal length 20cm Forms a real Image of 4cm high of an object which is 5cm high. If the Image is 36cm away from the lens, determine by graphical method the position of the object.
Answers
Answer:
in image
Explanation:
I don't think so it helped but through this you can do the question exactly like this ( in this way) ...
Star A is identical to Star B, but Star A is twice as far from us as Star B. Therefore, _______________.
Answers
Star A's light will take longer to reach us.
a proton accelerates from rest in a uniform electric field of 600 n/c. at one later moment, its speed is 1.50 mm/s (nonrelativistic because v is much less than the speed of light). find the time interval, in ms, that the proton takes to reach this speed. flag question: question 11
Answers
The proton accelerates from rest in a uniform electric field of 600 n/c. In order to find the time interval it takes for the proton to reach a speed of 1.50 mm/s.
We need to use the equation v = v₀ + at, where v is the final velocity, v₀ is the initial velocity (which is 0 in this case), a is the acceleration, and t is the time interval. The acceleration of the proton in the electric field is a = E/m, where E is the electric field and m is the mass of the proton. Substituting these values into the equation gives us:
1.50 mm/s = 0 + (600 n/c/1.67 x 10⁻²⁷ kg) x t
Rearranging the equation and solving for t gives us the time interval:
t = 1.50 mm/s/(600 n/c/1.67 x 10⁻²⁷ kg)
t = 8.33 x 10⁻¹³ s
t = 8.33 ms
Therefore, it takes the proton 8.33 ms to accelerate from rest to a speed of 1.50 mm/s in the uniform electric field of 600 n/c.
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A 1. 1 kg box drops two meters from a shelf and comes to rest after 0. 021 s on the floor. What force did the box hit the floor
Answers
A 1 kg box falls two metres from a shelf and lands on the ground after 0.021 seconds. The box impacted the ground with a force of around 524.7 N.
The box impacted the ground with a force of around 524.7 N.
Explanation: We can determine the force using the equation F = m * (v/t), where m is the box's mass, v is the velocity change (which is the ultimate velocity because the box starts at rest and comes to a halt), and t is the time it takes for the box to stop.
Given that the box falls 2 metres and its terminal velocity is 0 m/s, v = 2 m/s.
524.7 N is equal to F = 1.1 kg * (2 m/s / 0.021 s).
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An electroscope is a device with a metal knob, a metal stem, and freely hanging metal leaves used to detect charges. The diagram below shows a positively charged leaf electroscope.
As a positively charged glass rod is brought near the knob of the electroscope, the separation of the leaves will
remain the same
increase
Answers
As a positively charged glass rod is brought near the knob of the electroscope, the separation of the leaves will increase.
What is Charge?
Charge is a fundamental property of matter that determines how objects interact with each other through the electromagnetic force. It is a physical property that can be positive or negative and can be measured in coulombs (C).
This is because the positively charged glass rod will induce a negative charge on the metal knob of the electroscope. The negative charges will repel the electrons in the metal leaves, causing them to move away from each other and increasing their separation. The greater the amount of charge on the glass rod, the greater the separation between the leaves will be.
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Find the angle ϕ between the filter's polarizing axis and the direction of polarization of light necessary to increase the ratio of the clouds' intensity to that of the blue sky so that it is three times the normal value. Express your answer in degrees to four significant figures
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"The required angle Ф between the filter's polarizing axis and the direction of polarization of light necessary to increase the ratio of the clouds' intensity to that of the blue sky so that it is three times the normal value is 65.9°."
A photographer wants to click a picture of a cloud formation, the ratio of clouds intensity to that of the blue sky photographer uses polarizing filter from Malus law,
I = I₀ cos²Ф
So, I f = I i cos²Ф
As the light from cloud is polarized, its intensity reduces to half.
I c = I₀/2
The intensity of light from sky is polarized light.
I s = I₀ cos²Ф
Hence, the ratio of intensities is,
I c/I s = (I₀/2)/(I₀ cos²Ф)
3 = (I₀/2)/(I₀ cos²Ф)
cos²Ф = 1/6
Thus, the required angle is Ф = cos⁻¹(1/√6) = 65.9°
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an open vertical tube has water in it. a tuning fork vibrates over its mouth. as the water level is lowered in the tube, the seventh resonance is heard when the water level is 217.75 cm below the top of the tube.
Answers
The speed of sound is found out to be 349.4 ms⁻¹ from the frequency of the seventh resonance heard when the water level is 217.75 cm below the top of the tube.
What is the frequency?Frequency of wave:
v = nλ
where, v = speed of sound, n = frequency, λ = wavelength
Speed of sound:
v = frequency n × wavelength λ
Frequency, n = v/λ
Wavelength, λ = v/n
The 7th resonance frequency of the tuning fork is given by:
n = 7 × f
where, f is the frequency of the tuning fork
Speed of sound, v = nλ
Speed of sound, v = 7fλ
Speed of sound, v = 7 × 256 Hz × λ
λ = 1.3671 m
Distance travelled by the sound wave in the water column is L = h + l
where, h = length of the air column and l = length of water column where the resonance was heard.
L = h + l
L = 217.75 cm + 50 cm
L = 267.75 cm = 2.6775 m
Length of the air column, h = L - l
where, l = length of water column where the resonance was heard.
h = 2.6775 m - 0.5 m
h = 2.1775 m
Wavelength of sound wave in air column, λ₁ = 4h
λ₁ = 4 × 2.1775 m
λ₁ = 8.71 m
Frequency of the sound wave in air column is given by:
n = v/λ₁
n = 349.4 ms⁻¹ / 8.71 m
n = 40.112 Hz
The 7th resonance frequency of the tuning fork is given by:
n = 7 × f
40.112 Hz = 7 × f
Frequency of the tuning fork, f = 5.73 Hz.
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Consider the spectra of the two main sequence stars below (Star 1 on the left and Star 2 on the right) and sort the statements into the true or false bins. The intensity axes are not necessarily on the same scale. 350 450 550 Wavelength (nm) 350 45Q750 650 750 Wavelength (nm) true false Star 1 has a longer lifetime than Star 2 Star 2 is bluer than Star 1 Star 2 has a lower mass than Star 1 Star 1 has prominent hydrogen lines Star 2 has a higher luminosity than Star 1 Star 2 is cooler than Star 1.
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. Additionally, Star 1 has prominent hydrogen lines, indicating a lower temperature than Star 2. Therefore, the statements can be sorted into the true and false bins as indicated above.
True: Star 1 has a longer lifetime than Star 2; Star 2 is bluer than Star 1; Star 2 has a lower mass than Star 1; Star 1 has prominent hydrogen lines.
False: Star 2 has a higher luminosity than Star 1; Star 2 is cooler than Star 1.
The spectra of the two main sequence stars illustrate some differences between the two stars. Star 1 is on the left and has a longer lifetime than Star 2, which is on the right. This is evident from the intensity axes that are not on the same scale. Star 2 has a lower mass than Star 1, is bluer than Star 1, and has a lower luminosity
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A 910-kg sports car collides into the rear end of a 2100-kg SUV stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 2.5m before stopping. The police officer, estimating the coefficient of kinetic friction between tires and road to be 0.80, calculates the speed of the sports car at impact.
1.A 910-kg sports car collides into the rear end of a 2100-kgSUV stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 2.5m before stopping. The police officer, estimating the coefficient of kinetic friction between tires and road to be 0.80, calculates the speed of the sports car at impact.
1.What was the speed sports car at impact?
Answers
The speed of the sports car at impact when kinetic friction between tires and road is 0.80 is 15.55 m/s.
It is given that Mass of sports car, ms = 910 kg, Mass of SUV, mSUV = 2100 kg, and Initial velocity of sports car, us = ?, Final velocity of sports car, v = 0, Initial velocity of SUV, uSUV = 0, Final velocity of SUV, vSUV = 0, and Coefficient of kinetic friction, μk = 0.80. Distance covered before stopping, s = 2.5 m.
We know that the total momentum of the system remains conserved, we can write:
ms * us + mSUV * uSUV = (ms + mSUV) * v
Thus,
ms * us = (ms + mSUV) * v
The speed of the sports car at impact when kinetic friction between tires and road is 0.80 is 15.55 m/s.
It is given that Mass of sports car, ms = 910 kg, Mass of SUV, mSUV = 2100 kg, and Initial velocity of sports car, us = ?, Final velocity of sports car, v = 0, Initial velocity of SUV, uSUV = 0, Final velocity of SUV, vSUV = 0, and Coefficient of kinetic friction, μk = 0.80. Distance covered before stopping, s = 2.5 m.
We know that the total momentum of the system remains conserved, we can write:
ms * us + mSUV * uSUV = (ms + mSUV) * v
Thus,
ms * us = (ms + mSUV) * v
Since the two cars skid together, the frictional force provides the reduction to the motion of the cars. The reduction force F = μk * N where N is the normal force acting on the cars, N = (ms + mSUV) * g where g is the acceleration due to gravity, g = 9.8 m/s².
We have to find the speed of the sports car at impact i.e. us. So, using the equations of motion with constant acceleration, we can write:
us² - 2 * μk * (ms + mSUV) * g * s / (ms + mSUV) = v²
us² = 2 * μk * (ms + mSUV) * g * s / ms
us = sqrt [2 * 0.80 * (910 + 2100) * 9.8 * 2.5 / 910]
us = 15.55 m/s
Therefore, the speed of the sports car at impact is 15.55 m/s.
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given what you learned from the figure, rank these types of light in order of increasing energy. 1. radio 2. infrared 3. orange 4. green 5. ultraviolet
Answers
Answer:
✓ 1. radio 2. infrared 3. orange 4. green 5. ultraviolet
Explanation:
true or false if the whole picture plane is affected by aerial diffusion, it stops being an effective indicator of depth.
Answers
If the whole picture plane is affected by aerial diffusion, it stops being an effective indicator of depth - this statement is true.
Aerial diffusion is the scattering of light by particles in the air. These particles cause distant objects to appear fainter and bluer than closer objects, leading to a decrease in visual clarity and the ability to perceive depth. Aerial diffusion can be utilized in painting and drawing to create an atmospheric perspective, which produces a sense of depth by making objects are that further away appear hazier and less distinct than those that are closer. However, if the entire picture plane is affected by aerial diffusion, this can make it difficult to distinguish between objects at different depths, which can result in a lack of clarity and depth perception in the painting or drawing.
A picture plane is a theoretical plane that corresponds to the surface of a painting or drawing. The picture plane is where the artist organizes and arranges the various elements of the composition to create a visual representation of a scene. The picture plane is where the viewer's eye interacts with the artwork, and where the illusion of depth and space is created. In this context, the picture plane is an important factor in the creation of depth and atmosphere in a painting or drawing.
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Why are masses listed on the periodic table not whole #'s. Ex. 15.9999 for oxygen?
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The masses listed on the periodic table are not whole numbers because they represent the weighted average of all the naturally occurring isotopes of an element.
What are Isotopes ?Isotopes are atoms of the same element that have different numbers of neutrons in their nuclei, resulting in slightly different masses. Since the abundance of each isotope in nature can vary, the weighted average takes into account the abundance of each isotope and their corresponding masses, resulting in a decimal value. For example, oxygen has three naturally occurring isotopes, with mass numbers of 16, 17, and 18.
Why only O-16 isotopes ?The most abundant isotope is oxygen-16, but the other isotopes are also present in trace amounts, leading to a weighted average of 15.9994 amu (atomic mass units). This is why the mass listed on the periodic table for oxygen is 15.999, which is a rounded value of the weighted average.
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The masses listed on the periodic table are not whole numbers because they represent the average atomic mass of all the naturally occurring isotopes of an element, taking into account their relative abundances.
What are isotopes ?
Isotopes are atoms of the same element that have different numbers of neutrons in their nucleus, which affects their atomic mass. Some isotopes of an element are more abundant than others, and their relative abundances are taken into account when calculating the average atomic mass.
For example, oxygen has three naturally occurring isotopes: oxygen-16, oxygen-17, and oxygen-18. Oxygen-16 is the most abundant isotope, making up about 99% of all oxygen atoms. Oxygen-17 and oxygen-18 are much less abundant, but they still contribute to the overall atomic mass of the element.
The atomic mass listed on the periodic table for oxygen (15.9994) is the weighted average of the atomic masses of all three isotopes, taking into account their relative abundances. This average is not a whole number because the isotopes have different atomic masses and abundances, and their contributions to the overall average are weighted accordingly.
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