A string is wrapped tightly around a fixed frictionless pulley ...

[Medesa]

A string is wrapped tightly around a fixed frictionless pulley that has a moment of inertia of 0.0352 kg  m2 and a radius of 12.5 cm. The string is pulled away from the pulley with a constant force of 5.00 N, causing the pulley to rotate.
 
  What is the speed of the string after it has unwound 1.25 m if the string does not slip on the pulley? A) 2.09 m/s
  B) 2.36 m/s
  C) 1.18m/s
  D) 3.18 m/s
  E) 4.95 m/s

Question 2

In order to simulate weightlessness for astronauts in training, they are flown in a vertical circle. If the passengers are to experience weightlessness, how fast should an airplane be moving at the top of a vertical circle with a radius of 2.5 km?
 
  A) 79 m/s
  B) 310 m/s
  C) 260 m/s
  D) 160 m/s
  E) 510 m/s

[bimper21]

Answer to Question 1

B

Answer to Question 2

D

[Medesa]

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[bimper21]

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