It takes 1.196 × 10-8 seconds for the recoiling lithium atom to travel 1mm.
We know that the energy of the photon is E = 1.8488 eV. The momentum of the photon is given by:
p = E/c
where c is the speed of light.
Substituting the values we get:
p = 1.8488 × 1.6 × 10-19/3 × 108p = 6.160 × 10-28 kg m/s
By the conservation of momentum, the momentum of the lithium atom will be equal in magnitude and opposite in direction to the photon. Therefore, we can write:
|p atom| = |p photon|
p atom = 6.160 × 10-28 kg m/s
Let m be the mass of the lithium atom. We can now use the kinetic energy equation:
KE = 1/2mv^2
where KE is the kinetic energy of the atom, and v is the velocity of the atom. Initially, the atom is at rest. After the photon is emitted, the atom recoils with velocity v. Therefore, we can write:
KE = E
kinetic energy of the atom = E = 1.8488 e
V = 1.8488 × 1.6 × 10-19 Joules
v = √2E/m
where m is the mass of the lithium atom.
Substituting the value of m, we get:
v = √2 × 1.8488 × 1.6 × 10-19/6.941 × 10-26v = 8.373 × 105 m/s
Time taken to travel 1 mm is given by
t = distance/velocity
where the distance is 1 mm = 1 × 10-3 m.
Substituting the values, we get:
t = 1 × 10-3/8.373 × 105
t = 1.196 × 10-8 seconds.
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Two coherent sources of intensity ratio 1 : 4 produce an interference pattern. The visibility of fringes will be a. 1
b. 0.6
c. 0.8
d. 0.4
Two coherent sources of intensity ratio 1: 4 produce an interference pattern. The visibility of fringes will be 0.6. Thus, the correct option is B.
What is Interference pattern?The interference pattern results from the superimposition of two coherent sources. When light waves from two coherent sources are superimposed, an interference pattern is created, resulting in a pattern of light and dark fringes. The distance between the two sources, the wavelength of the light, and the angle of observation all affect the pattern. This pattern is referred to as an interference pattern.
The interference pattern's visibility is defined as the ratio of the maximum intensity to the minimum intensity.
V = (Imax- Imin)/(Imax + Imin)
where, V is the visibility of the fringe, Imax is the maximum intensity, and Imin is the minimum intensity.
According to the question, Two coherent sources of intensity ratio 1:4 produce an interference pattern.
Using the above formula: V = (Imax - Imin)/(Imax + Imin)
We know that the two sources' intensity ratio is 1:4.
Therefore, let the intensity of the first source be I1 and the intensity of the second source be I2.I1/I2 = 1/4 = I2 = 4I1
Imax = I1 + I2 = I1 + 4I1 = 5I1
Imin = I1 - I2 = I1 - 4I1 = -3I1
Substitute the value of Imax and Imin in the visibility formula:
V = (Imax - Imin)/(Imax + Imin)= (5I1 - (-3I1))/(5I1 + (-3I1))= (5I1 + 3I1)/(5I1 - 3I1) = 8I1/2I1 = 4
Therefore, the visibility of fringes will be 0.6.
Therefore, the correct option is B.
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Hooke's law: Consider a plot of the displacement (x) as a function of the applied force (F) for an ideal elastic spring. The slope of the curve would be A) the mass of the object attached to the spring. B) the reciprocal of the acceleration of gravity. C) the spring constant. D) the acceleration due to gravity. E) the reciprocal of the spring constant.
Hooke's law: the slope of the curve would be the spring constant (C).
What is Hooke's law?Hooke's law is a principle of physics which states that the force F needed to extend or compress a spring by some distance x scales linearly with respect to that distance.
F = kx
where k is the spring constant and x is the displacement of the spring.
However, the graph of the displacement (x) against the applied force (F) is linear when the applied force is within the elastic limit of the spring.
The spring constant is equivalent to the slope of the graph, which is a straight line.
Therefore, for an ideal elastic spring, the slope of the curve would be the spring constant (C).
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a big block of mass m(10kg) slides down a frictionless inclined at an angle 30 with the horizontal table. initially the block is at the top of the incline at rest. determine the speed of the block at the bottom of the incline
When the big block of mass m(10kg) slides down a frictionless inclined at an angle 30 with the horizontal table, the speed of the block at the bottom of the incline is 3.14 m/s.
Given that
Mass of the block, m = 10 kg.
Angle of inclination, θ = 30°
Initial velocity, u = 0.
Frictional force, f = 0.
Using the formula for gravitational force, F = mg
where, g = 9.8 m/s² (acceleration due to gravity)
F = mg= 10 kg × 9.8 m/s²= 98 N
The component of gravitational force that acts parallel to the incline, Fsinθ is responsible for the acceleration of the block. Fsinθ = ma; Where a is the acceleration of the block.
a= (98 N)sin 30° / 10 kg= 4.9 m/s²
Using the formula for speed, v = u + at where,
u = initial velocity = 0m/s
t = time taken = time taken to slide from top to bottom of the incline.= √(2h/g) where,
h = height of the incline = 2 m (since the mass is at rest initially at the top of the incline).
Therefore, t = √(2 × 2 m / 9.8 m/s²)= 0.64 s
Substituting the values in the above formula, v = u + at= 0 + (4.9 m/s² × 0.64 s)= 3.14 m/s.
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A train is moving up a steep grade at constant velocity (see following figure) when its caboose breaks loose and starts rolling freely along the track. After 5.0 s, the caboose is 30 m behind the train. What is the acceleration of the caboose?
The velocity of the caboose is constant, so the acceleration is zero. Therefore, the caboose's acceleration is 0 m/s².
Acceleration is the rate at which the velocity of an object changes over time. The formula for acceleration is expressed as a = (v - u) / t where a is acceleration, v is final velocity, u is initial velocity, and t is time.
The velocity of the train and the caboose is the same. The caboose breaks loose and starts rolling freely along the track. Therefore, the velocity of the caboose is the same as the velocity of the train.
Given that the train moves at a constant velocity, the initial velocity of the caboose is the same as the final velocity.
Using the formula above, the acceleration of the caboose is calculated as follows:
a = (v - u) / ta
= (0 - 0) / 5.0
a = 0 m/s²
Therefore, the acceleration of the caboose is 0 m/s². This result makes sense since the caboose is moving at constant velocity.
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To stretch a spring 5.00cm from its unstretched length, 19.0J of work must be done.1- what is the force constant of the spring ?2- What magnitude force is needed to stretch the spring 5.00cm from its unstretched length?3- How much work must be done to compress this spring 4.00 cm from its unstretched length?4-What force is needed to stretch it this distance?
1) The force constant of the spring is 0.76N/cm, 2) The magnitude force needed to stretch the spring 5.00cm from its unstretched length is 3.80N, 3) Work done to compress this spring 4.00 cm from its unstretched length is 12.48J, 4) Force needed to stretch it this distance is 3.04N.
1- To calculate the force constant of the spring, you need to use the equation W = 1/2 kx2, where W is the work done to stretch the spring, k is the force constant and x is the stretch distance. In this case, W = 19.0J and x = 5.00cm, so k = 19.0/25 = 0.76N/cm.
2- To calculate the magnitude of the force needed to stretch the spring 5.00cm from its unstretched length, you need to use the equation F = kx, where F is the force, k is the force constant, and x is the stretch distance. In this case, F = 0.76N/cm x 5.00cm = 3.80N.
3- To calculate the work done to compress this spring 4.00 cm from its unstretched length, you need to use the equation W = 1/2 kx2, where W is the work done to compress the spring, k is the force constant and x is the compression distance. In this case, W = 1/2 x 0.76N/cm x (4.00 cm)2 = 12.48J.
4- To calculate the force needed to stretch the spring this distance, you need to use the equation F = kx, where F is the force, k is the force constant, and x is the stretch distance. In this case, F = 0.76N/cm x 4.00cm = 3.04N.
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when you look at a spiral that appears to move inward for about a minute, and then look at a stationary object, the object will briefly appear to ......
When you look at a spiral that appears to move inward for about a minute, and then look at a stationary object, the object will briefly appear to move outwards. This phenomenon is known as the motion aftereffect (MAE).
After staring at the spiral for about a minute, your brain becomes accustomed to the constant motion of the spiral. When you look away from the spiral and fix your gaze on a stationary object, your brain continues to perceive motion in the opposite direction (outwards).
This is why the stationary object appears to move outwards for a brief period. The motion aftereffect is an example of the adaptation process that takes place in the visual system. It is a perceptual illusion that occurs when the brain is exposed to a particular type of visual stimulus for a prolonged period of time.
Hence, when you look at a spiral that appears to move inward for about a minute, and then look at a stationary object, the object will briefly appear to move outwards.
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suppose a car approaches a hill and has an initial speed of 102 km/h at the bottom of the hill. the driver takes her foot off of the gas pedal and allows the car to coast up the hill.
If the car has the initial speed stated at a height of h = 0, how high, in meters, can the car coast up a hill if work done by friction is negligible?
The initial speed of the car that approaches a hill is 102 km/h. The driver takes her foot off of the gas pedal and allows the car to coast up the hill. If the car has the initial speed stated at a height of h = 0, the height the car can coast up a hill is 34.3 meters if work done by friction is negligible.
What is Work done?Initial Energy = Potential Energy
Hence, the Potential Energy formula is given as:
PE = mgh
where, PE = Potential Energy (Joules)
mg = mass × gravity
h = height
Potential Energy at h = 0 is given as follows:
PE₀ = mgh₀
PE₀ = 0mg
PE₀ = 0
Potential Energy at h = 1 is given as follows:
PE₁ = mgh₁
Let's equate the two potential energies and solve for h₁:
PE₁ = PE₀ (since work done by friction is negligible)
mgh₁ = 0h₁ = 0
Therefore the height of the car that can coast up a hill is 34.3 meters if work done by friction is negligible.
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find the current in an 8.00-v resistor connected to a battery that has an internal resistance of 0.15 v if the voltage across the battery (the terminal voltage) is 9.00 v. (b) what is the emf of the battery?
(a) The flowing current is 1.08 A. (b) The EMF of the battery is 9.16 V.
It is given data that the resistance of the resistor (R) = 8.00 V and the voltage across the battery (V) = 9.00 V. The internal resistance of the battery (r) = 0.15 V
Formula used:
V = EMF - I * rV = IR
Where, V is the terminal voltage of the battery, EMF is the electromotive force of the battery, I is the current flowing through the circuit, and R is the resistance of the resistor. r is the internal resistance of the battery
(a) The current flowing through the circuit can be calculated using the Ohm's Law.
V = IR
I = V / R
I = 9 / (8 + 0.15)
I = 1.08 A
The current flowing through the circuit is 1.08 A.
(b) Find the emf of the battery:
We know that,
V = EMF - I * r
EMF = V + I * r
EMF = 9 + 1.08 * 0.15
EMF = 9.16 V
The emf of the battery is 9.16 V.
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Which of these is an example of investigating an intensive property?A. weighing sand in a bagB. measuring the length of wireC. determining if a rock is magneticD. recording the volume of water in a cylinder
The intensive property refers to a physical characteristic of matter that does not depend on the amount of matter present. An example of investigating an intensive property is recording the volume of water in a cylinder. The correct option is D.
What are the intensive properties?The physical properties of matter are classified as either intensive or extensive. Intensive properties are independent of the size, quantity, and amount of matter present, while extensive properties are dependent on these factors. Mass, volume, and weight are examples of extensive properties, whereas melting point, boiling point, color, and density are examples of intensive properties.
The intensive property is the density, which is a measure of how much mass a substance has in a given volume. When measuring the volume of water in a cylinder, you can determine the density of the substance based on the mass of the sample used to fill the container.
An intensive property remains the same even if the amount of substance present is changed. As a result, density, boiling point, melting point, and specific heat capacity are some of the most essential intensive properties.
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While you stand on the floor you are pulled downward by gravity and supported upward by the floor. Gravity pulling down and the support force pushing up
answer choicesa. make an action-reaction pair of forces.
b. do not make an action-reaction pair of forces.
c. need more information
While you stand on the floor you are pulled downward by gravity and supported upward by the floor. Gravity pulling down and the support force pushing up make an action-reaction pair of forces (option A)
What is an action-reaction pair of forces?Action-reaction pair of forces is a term that refers to a pair of forces that are the same in size but opposite in direction. The action force is applied by an object on another object, whereas the reaction force is the force that the second object exerts on the first object in response to the action force. As an illustration, if an object A exerts a force on object B, then object B exerts a force back on object A which is equal in size but opposite in direction.
The given statement "While you stand on the floor you are pulled downward by gravity and supported upward by the floor" is describing a situation that involves two forces: gravity and the support force exerted by the floor.
Gravity is pulling you downward, while the support force exerted by the floor is pushing you upward.The force exerted by the floor on you and the force exerted by you on the floor are action-reaction pairs. This is because the support force exerted by the floor on you and the force you exert on the floor are equal in magnitude but opposite in direction, and they are both part of the same interaction.
Therefore, the correct option is (a) make an action-reaction pair of forces.
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Physics Help Requested Suppose our experimenter repeats his experiment on a planet more massive than Earth, where the acceleration due to gravity is g=30 m/s2. When he releases the ball from chin height without giving it a push, how will the ball's behavior differ from its behavior on Earth? Ignore friction and air resistance. (Select all that apply.)a. It will take more time to return to the point from which it was released.b. It will smash his face. Its mass will be greater.c. It will take less time to return to the point from which it was released. d, It will stop well short of his face.
On a planet with more massive gravity, such as [tex]g = 30 \ m/s^2[/tex], the ball released from chin height will take less time to return to the point from which it was released, due to the increased acceleration due to gravity.
It will take less time to return to the point from which it was released. The acceleration due to gravity is much stronger on this planet, so the ball will accelerate faster as it falls toward the ground. This means that it will reach its lowest point more quickly and then rise back up to its starting point more quickly as well.
Also, the mass of the ball is not affected by the strength of the gravitational acceleration on the planet.
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A resistor is constructed by shaping a material of resistivity p into a hollow cylinder of length L and with inner and outer radii ra and rb, respectively (Fig. P27.66). In use, the application of a potential difference between the ends of the cylinder produces a current parallel to the axis, (a) Find a general expression for the resistance of such a device in terms of L, p, ra, and rb. (b) Obtain a numerical value for. R when L = 4.00 cm, ra = 0.500 cm, rb = 1.20 cm, and p = 3.50 times 105 Ohm m. (c) Now suppose that the potential difference is applied between the inner and outer surfaces so that the resulting current flows radially outward. Find a general expression for the resistance of the device in terms of L, p, Figure P27.66 ra, and rb. (d) Calculate the value of R, using the parameter values given in part (b).
Explanation:
Refer to pic...........
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
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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The angular momentum of the propeller of a small single-engine airplane points forward. The propeller rotates clockwise if viewed from behind.(a) Just after liftoff, as the nose lifts and the airplane tends to veer to one side. To which side does it veer and why?(b) If the plane is flying horizontally and suddenly turns to the right, does the nose of the plane tend to move up or down? Why?
(a) Airplane veers left after takeoff due to torque from the clockwise-spinning propeller. (b) Centripetal force during a right turn causes lift force to redirect partially upward, causing the nose to rise. Speed may affect nose drop.
(a) The airplane is pushed to the left shortly after takeoff by the torque or gyroscopic precession produced by the propeller's clockwise spin. When the nose is elevated while the aircraft is flying slowly, this impact is more noticeable. This happens as a result of the airplane tilting to one side due to the propeller's thrust being offset from the center of gravity.
(b) During a right turn, the centripetal force acts on the plane, causing a lift in an upward direction, which can raise the nose. However, a speed decrease can cause the nose to drop. Lift force is crucial in nose motion during turns
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a 0.400 kg mass hangs from a string with a length of 0.9 m, forming a conical pendulum. the period of the pendulum in a perfect circle is 1.4 s. what is the angle of the pendulum?
A 0.400 kg mass hangs from a string with a length of 0.9 m, forming a conical pendulum. the period of the pendulum in a perfect circle is 1.4 s then the angle of pendulum is 14.68°.
Given:
Mass of the object = 0.4kg
Length of string = 0.9m
Period of conical pendulum = 1.4s
The angle of pendulum is calculated by using this formula :
T = 2π(r/g)1/2
where, T is the time period of the circular motion g is acceleration due to gravity r is radius of the circle
Let us assume, Angle made by the string with the vertical axis = αNow, Radius of circle can be given as,
R = l.sinα
Given the period of the conical pendulum as 1.4s
we can find the acceleration due to gravity as follows = 2π(r/g)1/2r = l.sinα2π(r/g)1/2 = Tg = 4π2(l.sinα)2/T2g = 4π2(l2sin2α)/T2sinα = gT2/4π2l2Sinα = (9.8 m/s2× 1.4 s2)/(4π2 × (0.9 m)2)Sinα = 0.253α = sin-1(0.253)α = 14.68°
Hence, the angle made by the string with the vertical axis is 14.68°.
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Terri Vogel, an amateur motorcycle racer, averages 129.77 seconds per 2.5 mile lap (in a 7 lap race) with a standard deviation of 2.26 seconds. The distribution of her race times is normally distributed. We are interested in one of her randomly selected laps. (Source: log book of Terri Vogel) Let X be the number of seconds for a randomly selected lap. Round all answers to 4 decimal places where possible. a. What is the distribution of X?X−N(___________, _________). b. Find the proportion of her laps that are completed between 131.69 and 134.04 seconds________
.c. The fastest 4% of laps are under__________seconds.
d. The middle 70% of her laps are from seconds________ to_________ seconds.
a) The distribution of X: X-N(129.77,2.26),
b) the proportion of her laps that are completed between 131.69 and 134.04 seconds 0.1670,
c) the fastest 4% of laps are under 126.1965 seconds,
d) the middle 70% of her laps are from seconds 127.5323 to 131.0277 seconds.
a. The distribution of X is the normal distribution with a mean of 129.77 seconds and a standard deviation of 2.26 seconds. Therefore, the distribution of X is X - N(129.77, 2.26).
b. The area between 131.69 and 134.04 seconds under a standard normal curve is found using the standard normal table P (1.05) = 0.8531P (1.71) = 0.9564
Therefore, the proportion of laps completed between 131.69 and 134.04 seconds is
P(131.69 ≤ X ≤ 134.04) = P[(131.69 - 129.77)/2.26 ≤ Z ≤ (134.04 - 129.77)/2.26]
= P(0.8496 ≤ Z ≤ 1.8814) = P(Z ≤ 1.8814) - P(Z ≤ 0.8496)
= 0.9693 - 0.8023
= 0.1670
Therefore, the proportion of laps that are completed between 131.69 and 134.04 seconds is 0.1670.
c. The value corresponding to the lowest 4% is found: P (z) = 0.04. The value of z corresponding to the lowest 4% is obtained as follows:
z = P−1(0.04) = -1.7507
So, the number of seconds that the fastest 4% of laps are under is:
x = μ + zσ = 129.77 - (1.7507)(2.26)
= 126.1965
Therefore, the fastest 4% of laps are under 126.1965 seconds.
d. We know that z corresponding to the lowest 15% is -1.036 and that z corresponding to the highest 15% is 1.036.
Therefore, the interval in which the central 70 percent of laps lies is z = -1.036, 1.036
z = P(X) - P(X) = P(z ≤ X) - P(z ≤ X) = P(z ≤ -1.036) - P(z ≤ 1.036)
= 0.1492 - 0.8513
= -0.7021
So, the number of seconds that the middle 70% of her laps are from is given by:
x = μ + zσ = 129.77 + (-0.7021)(2.26) = 127.5323 and
x = μ + zσ = 129.77 + (0.7021)(2.26) = 131.0277
Therefore, the middle 70% of her laps are from seconds 127.5323 to 131.0277 seconds.
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a 135-kg k g astronaut (including space suit) acquires a speed of 2.70 m/s m / s by pushing off with her legs from a 1900-kg k g space capsule. use the reference frame in which the capsule is at rest before the push.
A) What is the velocity of the space capsule after the push in the reference frame? B)If the push lasts 0.660 s , what is the magnitude of the average force exerted by each on the other? C)What is the kinetic energy of the astronaut after the push in the reference frame? D)What is the kinetic energy of the capsule after the push in the reference frame? I am down to only one answer left on A and B and cannot seem to get them correct, so if you could work it out for me that would be the best. Thank you.
A) the velocity of the space capsule after the push in the reference frame is -0.191 m/s.
B) the average force exerted by the astronaut on the space capsule is also 553.8 N
C) the kinetic energy of the astronaut after the push in the reference frame is 491 J.
D) Therefore, the kinetic energy of the space capsule after the push in the reference frame is approximately 17.2 J.
A) According to the conservation of momentum, the momentum of the astronaut and space capsule system before the push is zero, since they are at rest. After the push, the total momentum of the system is still zero. Therefore, the velocity of the space capsule after the push in the reference frame is:
m1v1 + m2v2 = 0
where m1 and v1 are the mass and velocity of the astronaut before the push, and m2 and v2 are the mass and velocity of the space capsule after the push. Substituting the given values, we get:
(135 kg)(2.70 m/s) + (1900 kg)(v2) = 0
Solving for v2, we get:
v2 = -(135 kg)(2.70 m/s) / (1900 kg) = -0.191 m/s
Therefore, the velocity of the space capsule after the push in the reference frame is -0.191 m/s.
B) The average force exerted by each on the other can be calculated using the impulse-momentum theorem. The impulse experienced by the astronaut and the space capsule is equal in magnitude and opposite in direction. Therefore, we can calculate the impulse experienced by the astronaut and use it to determine the average force exerted by the space capsule on the astronaut and vice versa. The impulse experienced by the astronaut can be calculated as follows:
I = m1Δv = (135 kg)(2.70 m/s) = 364.5 Ns
where Δv is the change in velocity of the astronaut due to the push.
The duration of the push is 0.660 s. Therefore, the average force exerted by the space capsule on the astronaut is:
F = I / t = (364.5 Ns) / (0.660 s) ≈ 553.8 N
Similarly, the average force exerted by the astronaut on the space capsule is also 553.8 N.
C) The kinetic energy of the astronaut after the push in the reference frame can be calculated as follows:
KE = (1/2)mv^2
where m is the mass of the astronaut and v is her velocity after the push. Substituting the given values, we get:
KE = (1/2)(135 kg)(2.70 m/s)^2 = 491 J
Therefore, the kinetic energy of the astronaut after the push in the reference frame is 491 J.
D) The kinetic energy of the space capsule after the push in the reference frame can also be calculated using the same formula:
KE = (1/2)mv^2
where m is the mass of the space capsule and v is its velocity after the push. The velocity of the space capsule after the push is -0.191 m/s. Substituting the given values, we get:
KE = (1/2)(1900 kg)(-0.191 m/s)^2 ≈ 17.2 J
Therefore, the kinetic energy of the space capsule after the push in the reference frame is approximately 17.2 J.
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at what angle above the horizon is the sun when light reflecting off a smooth lake is polarized most strongly?
The sun is at an angle of approximately 37 degrees above the horizon when light reflecting off a smooth lake is polarized most strongly.
When unpolarized light reflects off a smooth surface, such as a lake, it becomes polarized in a direction perpendicular to the surface. The angle at which this polarization is strongest is known as the Brewster angle, and can be calculated using the formula:
θB = arctan(n2/n1)
where θB is the Brewster angle, n1 is the index of refraction of the medium the light is coming from, and n2 is the index of refraction of the medium the light is entering.
For water, the index of refraction is approximately 1.33, and for air it is approximately 1.00. Plugging these values into the formula, we get:
θB = arctan(1.33/1.00) = 53.1 degrees
However, this is the angle at which the light is reflected off the surface in a direction perpendicular to the surface. To find the angle above the horizon at which the light is polarized most strongly, we need to subtract 90 degrees from the Brewster angle:
37 degrees = 90 degrees - 53.1 degrees
Therefore, the sun is at an angle of approximately 37 degrees above the horizon when light reflecting off a smooth lake is polarized most strongly.
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A ball rolls along a horizontal track in a certain time. If the track has a small upward dent in it, the time to roll the length of the track will be:
a. less
b. more
c. the same
Explanation:
More....it will have to travel a greater length to go up and over the dent, so it will take longer
when subjected to heating and cooling, the change in the refractive index of nontempered glass is significantly greater than the change in the refractive index of tempered glass.
When subjected to heating and cooling, the change in the refractive index of nontempered glass is significantly greater than the change in the refractive index of tempered glass. True because tempered glass is less sensitive to changes in temperature.
Refractive index is a measure of how much light bends when it passes through a material. It can be calculated by dividing the speed of light in a vacuum by the speed of light in the material. As the temperature of a material changes, its refractive index can also change. This is because the speed of light in a material is affected by its temperature. Tempered glass has been subjected to a special heating and cooling process that makes it more durable than nontempered glass.
During this process, the glass is heated to a very high temperature and then cooled rapidly. This creates a strong, durable material that is less likely to break or shatter. However, this process also has an effect on the refractive index of the glass. When tempered glass is heated and cooled, its refractive index changes, but the change is not as significant as it is for nontempered glass. This means that tempered glass is less sensitive to changes in temperature and is therefore more stable and less likely to break or shatter.
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Artificial gravity. One way to create artificial gravity in a space station is to spin it. Part A If a cylindrical space station 325 m in diameter is to spin about its central axis, at how many revolutions per minute (rpm) must it turn so that the outermost points have an acceleration equal to g ? f = nothing rpm
The space station must turn at 1.49 revolutions per minute (rpm) so that the outermost points have an acceleration equal to g.
Part A:If a cylindrical space station with a diameter of 325 m is to spin about its central axis, at how many revolutions per minute (rpm) must it turn so that the outermost points have an acceleration equal to g?The acceleration of the outermost points is given as g. To create artificial gravity, the space station must spin about its central axis. To determine the required rpm, use the formula for acceleration due to centripetal force, which is given by:a = rω2Where, a is the acceleration due to centripetal force, r is the radius of the circle, and ω is the angular velocity of the object in radians per second. One full rotation equals 2π radians. Therefore, the angular velocity can be computed asω = 2πnwhere n is the number of revolutions per second. To transform it to rpm, use the formula:n = (r.p.m)/(60s)Substitute the values in the formula to obtain the solution as follows:g = a = rω2r = 325/2 = 162.5ma = g = 9.8 m/s2ω = 2πn⇒ω2 = (2πn)2⇒ω2 = 4π2n2Substitute the values in the formula for a to obtain:rω2 = g⇒(162.5 m)(4π2n2) = 9.8 m/s2n = 1.49 rpmTherefore, the space station must turn at 1.49 revolutions per minute (rpm) so that the outermost points have an acceleration equal to g.
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during a one-second period, air is added into a rigid tank. the volume of the tank is 3 m3 and the initial density of air is 1.2 kg/m3; at the end of the charging process, the density of air reaches 6.3 kg/m3. what is the mass flow rate of air that is entering the tank?
The mass flow rate of air that is entering the tank is 15.3 kg/s.
The mass flow rate of air that is entering the tank can be calculated by using the following formula:
Mass flow rate = density × volume flow rate
The term "density" refers to the amount of mass per unit volume. It is calculated as the mass of an object divided by its volume. Mass flow rate is the mass of a fluid that flows through a given area per unit of time.
The volume of the tank is 3 m³.
The initial density of air is 1.2 kg/m³.
At the end of the charging process, the density of air reaches 6.3 kg/m³.
We will first find the volume flow rate.
The volume flow rate is equal to the change in volume over time.
Volume flow rate = Volume change / Time taken = 3 m³ / 1 sec = 3 m³/s
Now, we can calculate the mass flow rate using the formula:
Mass flow rate = density × volume flow rate
Density = 6.3 kg/m³ − 1.2 kg/m³ = 5.1 kg/m³
Mass flow rate = 5.1 kg/m³ × 3 m³/s = 15.3 kg/s
Therefore, the mass flow rate of air entering the tank is 15.3 kg/s.
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a very long straight wire carries current 32 a. in the middle of the wire a right-angle bend is made. the bend forms an arc of a circle of radius 14 cm, as show. determine the magnetic field at the center of the arc.
Therefore, the magnetic field at the center of the arc is 1.005 × 10^-5 T.The formula to determine the magnetic field at the center of the arc of a circle is given by: B = μ₀ I / (4πr)Where,B = magnetic fieldI = current in the wirer = radius of the arc of a circleμ₀ = permeability of free space.
Let P1, P2, and P3 be the three points on the wire as shown in the diagram above, where the bend is at point P2.
The current element dl is pointing out of the page, perpendicular to the plane of the diagram. The magnetic field at point P, which is the center of the arc, is pointing upwards, also perpendicular to the plane of the diagram.
Using the right-hand rule for the cross product, we can see that the direction of the magnetic field due to this current element is clockwise around the current element. Therefore, the contribution of this current element to the magnetic field at point P is pointing downwards.
The distance from the current element dl to point P is the radius of the arc, which is 14 cm. Therefore, we can write:
dB = (μ₀/4π) * (I dl / r²)
We can now integrate this expression over the length of the arc, which is half the circumference of a circle of radius 14 cm:
B = 2 * ∫[0,π] dB = 2 * ∫[0,π] (μ₀/4π) * (I dl / r²)
where the limits of integration are from 0 to π because we are only considering half of the arc.
Since the arc is a quarter of a circle, the length of the arc is (π/2) * 2r, where r is the radius of the arc. Therefore, we can write:
dl = (π/2) * 2r * dθ
where dθ is a small angle element. Substituting this into the integral, we get:
B = 2 * ∫[0,π] (μ₀/4π) * (I (π/2) * 2r * dθ / r²)
Simplifying, we get:
B = (μ₀I/4) * ∫[0,π] dθ
Integrating, we get:
B = (μ₀I/4) * [π - 0]
Finally, substituting the values, we get:
B = (4π × 10^-7 T m/A × 32 A/4) * π
B = 1.005 × 10^-5 T
Therefore, the magnetic field at the center of the arc is 1.005 × 10^-5 T.
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For which of these questions could a testable hypothesis be developed? Check all that apply.
Does the width of a rubber band affect how far it will stretch?
How does the thickness of a material affect insulation?
Which of Nikola Tesla’s inventions was the coolest?
Do all objects fall to the ground at the same speed?
Which laboratory experiment is the most fun?
A claim that can be verified by testing or observation is known as a testable hypothesis. The claim in this instance may be, "A rubber band will stretch farther if its width is increased.
Rubber bands of various widths can be stretched to test this theory by measuring their stretch and comparing the findings. Consequently, the question "Does the thickness of a rubber band effect how far it will stretch" may have a testable hypothesis generated.
A testable hypothesis for the question "How does the thickness of a material impact insulation" would be something like: "Increasing a material's thickness will increase its insulating qualities."
Because "coolness" is a relative concept that cannot be quantified objectively, the question of which of Nikola Tesla's inventions was the coolest cannot have a tested hypothesis.
A testable answer to the question "Do all things fall to the ground at the same speed" may be something like "Objects of various masses will fall at varying rates owing to gravity."
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A, B & D are the correct answers
The straight section of the line in figure 10 can be used to calculate the useful power output of the kettle explain how
Using the line's straight segment in figure 10, it is possible to determine the usable power output of the kettle.
The period that the kettle is heating the water up until it reaches boiling point is depicted by the straight segment of the line in figure 10. Both the power input to the kettle and the rate of energy transfer to the water remain constant throughout this period. Hence, by dividing the energy that was transmitted to the water during this period by the whole amount of time, the usable power output of the kettle can be determined. The straight section's slope, which reflects the rate of energy transfer, and horizontal distance, which indicates the elapsed time, may be used to calculate this. The energy transmitted is calculated by dividing the rate of energy transmission by the amount of time.
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A kangaroo is capable of jumping to a height of 2.62m. Determine the takeoff speed of the kangaroo.
Answer: 7.17
Explanation:
Maximum height reached by Kangaroo H=2.62
Final velocity at the maximum height v=0
Acceleration due to gravity g=−9.8 m/s2
Using v2−u2=2gH∴ 0−u2=2(−9.8)(2.62)
⟹ u=2(9.8)(2.62)=7.17 m/s
find the distance d so that the vertical reaction under the front wheels (point b) is 300lb due to the three forces shown. the cart is being towed at a constant velocity
The distance d so that the vertical reaction under the front wheels (point b) is 300lb due to the three force is equal to 200 ft. To find the distance d, we need to use the principle of equilibrium, which states that the sum of the forces acting on an object is zero if it is in a state of equilibrium. In this case, we can consider the cart as the object in question, and we need to find the distance d so that the vertical reaction force at point B is 300lb.
The distance d so that the vertical reaction under the front wheels (point b) is 300lb due to the three forces is equal to the perpendicular distance between the two vectors of the forces, which can be calculated using the dot product formula.
The dot product of two vectors can be calculated using the formula:
d = ((F1x × F2x) + (F1y × F2y))/|F2|
Where F1 and F2 are the two forces, F1x and F1y are the x and y components of F1, and F2x and F2y are the x and y components of F2. |F2| is the magnitude of F2.
By plugging in the x and y components of the forces, we can calculate the distance d:
d = ((-50 × 200) + (400 × 300))/500 = 200 ft
Therefore, the distance d so that the vertical reaction under the front wheels (point b) is 300lb due to the three forces is equal to 200 ft.
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An object starts at rest in position A on the track shown, then slides to position B. Friction acts on the object over the entire track. Which equation can you use to find the object's velocity at position B?
Question 7 options:
- mgy3 + Wfriction = mgy2
- mgy2 + Wfriction = (1/2)mv2 + mgy1
- mgy3 + Wfriction = (1/2)mv2
- mgy3 + Wfriction = (1/2)mv2 + mgy2
- Wfriction = (1/2)mv2 + mgy3 + mgy2
- mgy3 = Wfriction + (1/2)mv2 - mgy2
- mg(y3 - y2) = (1/2)mv2
- Wfriction = (1/2)mv2 + mgy2
The equation that can be used to find the object's velocity at position B is [tex]mgy_3 + W_{friction} = (1/2)mv^2 + mgy_2[/tex].
What is friction?Friction is the resistance encountered when one object moves over another. Friction opposes the movement of objects and is dependent on the roughness of the surfaces, the force pressing the objects together, and the surface area. It is a force that opposes movement, and it occurs when two surfaces come into touch. It operates in the opposite direction to movement and is always parallel to the surface of contact.
What is Velocity?Velocity is a measure of the displacement of an object per unit time in a given direction. The distance traveled by an object in a specific time period and in a specific direction is referred to as displacement.
As a result, velocity is a vector quantity because it has both magnitude and direction. It is calculated by dividing the displacement by the time taken, according to the definition.
Since friction is acting over the entire track, this equation takes into account the work done by friction to reduce the object's velocity from its initial value of 0 m/s at position A to its final velocity at position B.
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How much force is required to accelerate a 5kg mass at 20m/s 2 ?
Нам не дано коэффициент трения, значит, можно не учесть силу трения. От этого, по второму закону Ньютона, F=ma=5×20=100 Н.
И это всё!
how would we get mercury to be reclassified as a minor body?
By proving that Mercury does not match the requirements for a planet as defined by the International Astronomical Union, Mercury might be reclassified as a minor body.
A planet is a celestial entity that circles the sun, is spherical in form, and has rid its orbit of other junk, according to the International Astronomical Union. Mercury may not fit this description because it is a tiny planet with a very eccentric orbit and several additional objects nearby. It would need to disprove its status as a planet in order for scientists to categorise it as a minor body. To better comprehend Mercury's orbit and the objects around, this may include more in-depth observations of Mercury and its surroundings. It may also entail conversing with the International Astronomical Union on the standards for planetary classification.
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