A 1.20-kg ball is hanging on the end of a rope. The rope makes an angle 25.0 from the vertical when a 15.0 m/s horizontal wind blows. If the wind's force on the rope is negligible, what is the drag force on the ball?
A)
32.3 N
B)
24.1 N
C)
3.68 N
D)
5.49 N
E)
11.8 N
Question 2
A figure skater is spinning slowly with arms outstretched. She brings her arms in close to her body and her angular speed increases dramatically. The speed increase is a demonstration of
A)
conservation of kinetic energy: her moment of inertia is decreased, and so her angular speed must increase to conserve energy.
B)
conservation of total energy: her moment of inertia is decreased, and so her angular speed must increase to conserve energy.
C)
conservation of angular momentum: her moment of inertia is decreased, and so her angular speed must increase to conserve angular momentum.
D)
Newton's second law for rotational motion: she exerts a torque and so her angular speed increases.
E)
This has nothing to do with mechanics, it is simply a result of her natural ability to perform.
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