A 2.00-kg ball has zero potential and kinetic energy. Maria drops ...

[segrsyd]

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.

[komodo7]

Answer to Question 1

B

Answer to Question 2

B

[segrsyd]

Thanks for the timely response, appreciate it

[tranoy]

Excellent