Show transcribed image text Question 5: A baseball is thrown vertically upward and feels no air resistance. As it is rising. A) both its momentum and its mechanical energy are conserved. B) its momentum is not conserved, but its mechanical energy is conserved. C) both its momentum and its energy are conserved. D) its kinetic energy is conserved, but its momentum is not conserved. E) its gravitational potential energy is not conserved, buts its momentum is conserved. Question 6: 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. Question 7: As You are leaving a building, the door opens outward. If the hinges on the door are on your right, what is the direction of the angular velocity of the door as you open it? A) up B) down C) to your left D) to your right E) forwards Question 8: A solid sphere (I=2/5mR^2) without slipping along a horizontal surface with a speed of 4.50 m/s when it starts up a ramp that makes an angle of 25.0 degree with the horizontal. What is the speed of the sphere after it has rolled 3.00 in up the ramp? A) 1.58 m/s B) 1.91 m/s C) 8.02 nuts D) 2.16 m/s E) 4.20 m/s Question 9: A solid sphere (I=2/5mR^2), solid cylinder (I = 1/2 mR^2), and a hollow pipe (I = mR^2) all have equal masses and radii and are of uniform density. If the three are released simultaneously at the top of an inclined plane and roll without slipping, which one will reach the bottom first? A) solid sphere. B) hollow pipe. C) solid cylinder D) They all reach the bottom at the same time. E) None of the above.
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