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Author Question: A 0.75-kg sphere is released from rest and is moving 5.0 m/s after falling 2.0 m in a viscous ... (Read 87 times)

viki

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on: Jul 28, 2018
A 0.75-kg sphere is released from rest and is moving 5.0 m/s after falling 2.0 m in a viscous medium. What is the change in mechanical energy caused by the force the viscous medium exerts on the sphere during this descent?
 a. -6.1 J
  b. -4.6 J
  c. -5.3 J
  d. -6.8 J
  e. -2.7 J

Question 2

A 1.5-kg block sliding on a rough horizontal surface is attached to one end of a horizontal spring (k = 200 N/m) which has its other end fixed. If this system is displaced 20 cm horizontally from the equilibrium position and released from rest, the block first reaches the equilibrium position with a speed of 2.0 m/s. What is the coefficient of kinetic friction between the block and the horizontal surface on which it slides?
 a. 0.34
  b. 0.24
  c. 0.13
  d. 0.44
  e. 0.17


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otokexnaru

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Reply #1 on: Jul 28, 2018
Answer to Question 1

C

Answer to Question 2

A


viki

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Reply 2 on: Jul 28, 2018
Gracias!

scottmt

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Reply 3 on: Yesterday
Excellent

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