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Author Question: A 1.20-kg ball is hanging on the end of a rope. The rope makes an angle 25.0 from the vertical when ... (Read 873 times)

Yi-Chen

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on: Jul 29, 2018
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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Dnite

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Reply #1 on: Jul 29, 2018
Answer to Question 1

D

Answer to Question 2

C


Yi-Chen

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Reply 2 on: Jul 29, 2018
Wow, this really help

AngeliqueG

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Reply 3 on: Yesterday
:D TYSM

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