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Author Question: A pile driver drives a post into the ground. The mass of the pile driver is 2500 kg, and it is ... (Read 171 times)

tnt_battle

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on: Jul 28, 2018
A pile driver drives a post into the ground. The mass of the pile driver is 2500 kg, and it is dropped through a height of 8.0 m on each stroke. If the resisting force of the ground is 2.0  106 N, how far is the post driven in on each stroke?
 a. 4.9 cm
  c. 16 cm
  b. 9.9 cm
  d. 49 cm

Question 2

Two kilograms of water at 1.00 atm at the boiling point of 100C is heated until all the water vaporizes. What is its change in entropy? (For water, Lv = 2.26  106 J/kg)
 a. 12,100 J/K
  c. 3030 J/K
  b. 6060 J/K
  d. 1220 J/K


kmb352

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

B

Answer to Question 2

A


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