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 123 times)

segrsyd · **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.