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Author Question: A 2.8-kg tool can move on a perfectly smooth ramp that slants at 42 above the horizontal. What are ... (Read 204 times)

wenmo

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on: Jul 29, 2018
A 2.8-kg tool can move on a perfectly smooth ramp that slants at 42 above the horizontal. What are the magnitude and direction of the acceleration of this tool if it is sliding (a) up the ram, (b) down the ramp?
 
  What will be an ideal response?

Question 2

A 0.140-kg baseball is dropped from rest. It has a speed of 1.20 m/s just before it hits the ground, and it rebounds with an upward speed of 1.00 m/s. The ball is in contact with the ground for 0.0140 s.
 
  What is the average force exerted by the ground on the ball during the time of contact? A) 2.00 N upwards
  B) 2.00 N downwards
  C) 22.0 N upwards
  D) 22.0 N downwards
  E) 0.00 N


ErinKing

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

(a) 6.6 m/s2 down the ramp (b) 6.6 m/s2 down the ramp

Answer to Question 2

C


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