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

[panfilo]

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.

[b614102004]

Answer to Question 1

D

Answer to Question 2

D

[panfilo]

Excellent

[bulacsom]

Gracias!