The most energy-efficient form of transportation in the animal ...

[kfurse]

The most energy-efficient form of transportation in the animal kingdom is a human on a bicycle. A basic physics principle that helps explain the bicycle's high efficiency relative to other technologies for human transportation is
 
  A) the law of conservation of energy.
  B) the law of gravity.
  C) the second law of thermodynamics.
  D) the electromagnetic force law.
  E) the work-energy principle.

Question 2

Except for such nuclear processes as nuclear reactors, nuclear bombs, and radioactivity, all of the common forces we see around us are due to just two underlying or fundamental forces. One of these two forces is the gravitational force.
 
  The other is
  A) contact forces.
  B) the color force.
  C) the chemical force.
  D) the frictional force.
  E) the electromagnetic force.

[Jossy]

Answer to Question 1

C

Answer to Question 2

E

[kfurse]

Excellent

[mjenn52]

Gracias!