Except for such nuclear processes as nuclear reactors, nuclear ...

[ereecah]

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

Question 2

Suppose an automobile's fuel could be made to burn hotter without harming the engine's operation. Would you still get the same amount of useful work from each gallon of gasoline?
 
  A) It wouldn't make any difference, because the efficiency is related only to the amount of input energy, and not to the temperature of this energy.
  B) You would get more work, because heat engines are more efficient at converting chemical energy into thermal energy when the temperature is higher.
  C) You would get more work, because heat engines are more efficient at converting thermal energy into work when the input temperature is higher.
  D) You would get less work, because heat engines run less efficiently when the input temperature is higher.
  E) You would get less work, because less chemical energy would be used at the higher temperature.

[Mollythedog]

Answer to Question 1

A

Answer to Question 2

C