1) Two children, A and B, are riding on a rotating merry-go-round. Child A is at
ID: 1702159 • Letter: 1
Question
1) Two children, A and B, are riding on a rotating merry-go-round. Child A is at a greater distance from the axis of rotation than child B. Which child has the larger tangential speed?a) Child A
b) Child B
c) They have the same zero tangential speed.
d) They have the same non-zero tangential speed.
e) There is not enough information given to answer the question.
2) A disk and a hoop of the same mass and radius are released at the same time at the top of an inclined plane. Which object reaches the bottom of the incline first?
(I disk = .5MR^2 and I hoop = MR^2)
a) The hoop
b) The disk
c) Both reach the bottom at the same time
d) It depends on the angle of inclination.
e) It depends on the length of the inclined surface.
3) Two equal forces are applied to a door. The first force is applied at the midopint of the door; the second is applied at the doorknob. Both forces are applied perpendicular to the door. Which force exerts the greater torque?
a) the first at the midpoint
b) the second at the doorknob
c) both exert equal non-zero torques
d) both exert zero torques
e) additional information is needed
4) A merry-go-round spins freely when Janice moves quickly to the center along a radius of the merry-go-round. It is true to say that_
a) the moment of inertia of the system decreases and the angular speed increases.
b) the moment of inertia of the system decreases and the angular speed decreases.
c) the moment of inertia of the system decreases and the angular speed remains the same.
d) the moment of inertia of the system increases and the angular speed increases.
e) the moment of inertia of the system increases and the angular speed decreases.
5) An astronaut is in a capsule in a stable orbit, about two Earth radii from the center of Earth. Her weight is_
a) zero N
b) the same as on the surface of Earth
c) about 1/2 of her weight on the surface of Earth
d) about 1/3 of her weight on the surface of Earth
e) about 1/4 of her weight on the surface of Earth
6) Planet Z-34 has a mass equal to one-third that of Earth and a radius equal to one-third that of Earth. With g representing, as usual, the acceleration due to gravity on the surface of Earth, the acceleration due to gravity on the surface of Z-34 is_
a) g/3
b) 3 g
c) 6 g
d) g/9
e) 9 g
7) How does the escape speed from Mars compare with that of the Earth?
(M Earth = 9.31 * M Mars; R Earth = 1.88 * R Mars)
a) 222%
b) 22.5%
c) 44.9%
d) 66.2%
e) 20.2%
8) A mass on a spring undergoes simple harmonic motion. When the mass is at its maximum displacement from equilibrium, its instantaneous velocity_
a) is maximum
b) is less than maximum, but not zero
c) is zero
d) cannot be determined without mass information given
e) cannot be determined without spring constant information given
9) The total mechanical energy of a simple harmonic oscillator is_.
a) zero as it passes the equilibrium point
b) zero when it reaches the maximum displacement
c) a maximum when it passes through the equilibrium point
d) a minimum when it passes through the equilibrium point
e) constant
Explanation / Answer
1 ) They have the same non zero tangential speed because both children will have completed the same number of revolutions or angular displacement. ( option d )
2 ) option A the hoop
3 ) option B the second at the doorknob
The distance between the knob and clamp is more than the distance between the midway and the clamp
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