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Author Question: A 1.2-kg mass is projected up a rough circular track (radius = 0.80 m) as shown. The speed of the ... (Read 386 times)

itsmyluck

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on: Jul 28, 2018

A 1.2-kg mass is projected up a rough circular track (radius = 0.80 m) as shown. The speed of the mass at point A is 8.4 m/s, and at point B, it is 5.6 m/s. What is the change in mechanical energy between A and B caused by the force of friction?
 
   


   
  a.
  2.7 J
   
  b.
  8.8 J
   
  c.
  4.7 J
   
  d.
  6.7 J
   
  e.
  19 J

Question 2

A 1.2-kg mass is projected down a rough circular track (radius = 2.0 m) as shown. The speed of the mass at point A is 3.2 m/s, and at point B, it is 6.0 m/s. What is the change in mechanical energy done on the system between A and B by the force of friction?
 
   


   
  a.
  8.9 J
   
  b.
  7.3 J
   
  c.
  8.1 J
   
  d.
  6.6 J
   
  e.
  24 J


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nmyers

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

c

Answer to Question 2

c


itsmyluck

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Reply 2 on: Jul 28, 2018
Excellent

frankwu0507

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Reply 3 on: Yesterday
Wow, this really help

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