Author Question: Is a fuel-cell vehicle properly described as a heat engine? A) Yes, because it uses thermal ... (Read 79 times)

panfilo · **on:** Jul 29, 2018

Is a fuel-cell vehicle properly described as a heat engine?

A) Yes, because it uses thermal energy to produce electricity.
B) Yes, because it uses chemical energy to create electric energy.
C) Yes, because it uses thermal energy to do work.
D) No, because it converts chemical energy directly to electric energy.
E) No, because it converts electric energy directly into chemical energy.

Question 2

The U.S. national debt is about 6 trillion. Expressed in powers of ten, this is

A) 6 106. B) 6 109. C) 6 1015. D) 6 1012. E) 6 1010.