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Author Question: A 3.0-kg mass is released from rest at point A of a circular frictionless track of radius 0.40 m as ... (Read 648 times)

Chelseaamend

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on: Jul 28, 2018

A 3.0-kg mass is released from rest at point A of a circular frictionless track of radius 0.40 m as shown in the figure. The mass slides down the track and collides with a 1.4-kg mass that is initially at rest on a horizontal frictionless surface. If the masses stick together, what is their speed after the collision?
 
   


   
  a.
  2.1 m/s
   
  b.
  1.7 m/s
   
  c.
  1.9 m/s
   
  d.
  1.5 m/s
   
  e.
  2.3 m/s

Question 2

Two equal masses are raised at constant velocity by ropes that run over pulleys, as shown below. Mass B is raised twice as fast as mass A. The magnitudes of the forces are FA and FB, while the power supplied is respectively PA and PB. Which statement is correct?
 
 
 
   
  a.
  FB = FA; PB = PA.
   
  b.
  FB = FA; PB = 2 PA.
   
  c.
  FB = 2 FA; PB = PA.
   
  d.
  FB = 2 FA; PB = 2 PA.
   
  e.
  PA = FA; PB = FB.


Chou

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

c

Answer to Question 2

b


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Chelseaamend

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Reply #2 on: Jul 28, 2018
Both answers were spot on, thank you once again


Chou

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Reply #3 on: Jul 28, 2018
Great! Please up vote :D


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