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Author Question: Starting from rest at t = 0, a 5.0-kg block is pulled across a horizontal surface by a constant ... (Read 34 times)

Diane

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on: Jul 28, 2018
Starting from rest at t = 0, a 5.0-kg block is pulled across a horizontal surface by a constant horizontal force having a magnitude of 12 N. If the coefficient of friction between the block and the surface is 0.20, at what rate is the 12-N force doing work at t = 5.0 s?
 a. 0.13 kW
  b. 0.14 kW
  c. 0.12 kW
  d. 26 W
  e. 12 W

Question 2

A 3.0-kg block is on a horizontal surface. The block is at rest when, at t = 0, a force (magnitude P = 12 N) acting parallel to the surface is applied to the block causing it to accelerate. The coefficient of kinetic friction between the block and the surface is 0.20 . At what rate is the force P doing work on the block at t = 2.0 s?
 a. 54 W
  b. 49 W
  c. 44 W
  d. 59 W
  e. 24 W


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Dinolord

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

D

Answer to Question 2

B


Diane

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Reply 2 on: Jul 28, 2018
Gracias!

dawsa925

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Reply 3 on: Yesterday
Wow, this really help

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