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Author Question: A 2.00-kg ball has zero potential and kinetic energy. Maria drops the ball into a 20.0-m deep well. ... (Read 24 times)

segrsyd

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on: Jul 28, 2018
A 2.00-kg ball has zero potential and kinetic energy. Maria drops the ball into a 20.0-m deep well. After the ball comes to a stop in the mud, the sum of its potential and kinetic energy is:
 a. 392 J.
  c. 784 J.
  b. -392 J.
  d. zero.

Question 2

Three Carnot engines operate between temperature reservoirs as follows: Engine A: Th = 1300 K, Tc = 1000 K; Engine B: Th = 1000 K, Tc = 700 K; Engine C: Th = 500 K, Tc = 350 K. Which two engines have the same thermal efficiency?
 a. A and B
  b. B and C
  c. A and C
  d. No two have the same thermal efficiency.


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komodo7

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

B

Answer to Question 2

B


segrsyd

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Reply 2 on: Jul 28, 2018
Wow, this really help

xiaomengxian

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Reply 3 on: Yesterday
Excellent

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