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Author Question: Preston pushes a wheelbarrow weighing 500 N to the top of a 50.0-m ramp, inclined at 20.0 with the ... (Read 65 times)

Brittanyd9008

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on: Jul 28, 2018
Preston pushes a wheelbarrow weighing 500 N to the top of a 50.0-m ramp, inclined at 20.0 with the horizontal and leaves it. Tamara accidentally bumps the wheelbarrow. It slides back down the ramp, during which a 60.0-N frictional force acts on it over the 50.0 m. What is the wheelbarrow's kinetic energy at the bottom at of the ramp? (g = 9.8 m/s2)
 a. 5550 J
  c. 8150 J
  b. 6550 J
  d. 13,100 J

Question 2

A 2.00-kg block of ice is at STP (0C, 1 atm) while it melts completely to water. What is its change in entropy? (For ice, Lf = 3.34  105 J/kg)
 a. zero
  c. 1220 J/K
  b. 584 J/K
  d. 2450 J/K


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vickybb89

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

A

Answer to Question 2

D


Brittanyd9008

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Reply 2 on: Jul 28, 2018
Great answer, keep it coming :)

daiying98

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Reply 3 on: Yesterday
Wow, this really help

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