A spinning ice skater is able to control the rate at which she rotates by pulling in her arms. Which of the following statements are true about the skater during this process? (There could be more than one correct choice.)
A) Her angular momentum remains almost constant.
B) Her moment of inertia remains almost constant.
C) Her kinetic energy remains almost constant.
D) She is subject to a constant non-zero torque.
A
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A baseball is hit at ground level. The ball is observed to reach its maximum height above ground level 3.0 s after being hit. And 2.5 s after reaching this maximum height, the ball is observed to barely clear a fence that is 97.5 m from where it was hit. How high is the fence?
a. 8.2 m b. 15.8 m c. 13.5 m d. 11.0 m e. 4.9 m
A bicycle wheel has an outside diameter of 66 cm. How far does a point on the rim travel when the wheel rotates through an angle of 70°?
What will be an ideal response?
As an airplane flying with constant velocity moves from a cold air mass into a warm air mass, the Mach number
1.increases. 2.decreases. 3.remains the same.
If Galaxy A is found to have a recessional velocity four times greater than Galaxy B, what can you say about their relative distances from Earth?
a. Galaxy A is four times closer than Galaxy B. b. Galaxy A is four times further away than Galaxy B. c. Galaxy A is twice as distant than Galaxy B. d. Galaxy A is twice as close than Galaxy B.