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Author Question: A 1.6-kg block slides down a plane (inclined at 25 with the horizontal) at a constant speed of 2.0 ... (Read 123 times)

nautica902

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  • Posts: 591
on: Jul 28, 2018
A 1.6-kg block slides down a plane (inclined at 25 with the horizontal) at a constant speed of 2.0 m/s. At what rate is the frictional force changing the mechanical energy of the block?
 a. +28 W
  b. +13 W
  c. -13 W
  d. -28 W
  e. +6.5 W

Question 2

A 3.0-kg block is on a frictionless horizontal surface. The block is at rest when, at t = 0, a force (magnitude P = 2.0 N) acting at an angle of 22 above the horizontal is applied to the block. At what rate is the force P doing work at t = 2.0 s?
 a. 2.3 W
  b. 2.0 W
  c. 1.4 W
  d. 1.7 W
  e. 1.2 W


lucas dlamini

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  • Posts: 327
Reply #1 on: Jul 28, 2018
Answer to Question 1

C

Answer to Question 2

A


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