The forces that hold the nucleus together A) are much stronger ...

[NClaborn]

The forces that hold the nucleus together
 
  A) are much stronger than electromagnetic forces.
  B) act over only very short distances.
  C) Both of the above.
  D) are attractive, that is, they pull in the inward direction.
  E) All of the above.

Question 2

Which method of fueling your car is likely to be more energy efficient, and why: gasoline used in a standard car engine or electricity taken from a coal-fueled generating plant and stored in lightweight car batteries? Assume that the batteries
 
  convert electricity to work at 100 efficiency, and that electricity is transported from the power plant to the car at 100 efficiency.
  A) Gasoline used in a standard car engine, because a car engine's fuel burns hotter and more efficiently than does the coal in a coal-fired power plant.
  B) Electricity from a coal-fired generating plant, because a car engine is a heat engine, and must follow the second law of thermodynamics, whereas a coal-fired generating plant is not.
  C) Gasoline used in a standard car engine, because a car engine burns its fuel directly in the automobile rather than miles away at the power plant.
  D) Electricity from a coal-fired generating plant, because such a plant runs at higher energy-efficiency than does a car engine.
  E) It wouldn't make any difference, because both the car engine and the generating plant are heat engines and are thus subject to the second law of thermodynamics.

[joshbk44]

Answer to Question 1

E

Answer to Question 2

D

[NClaborn]

Excellent

[scottmt]

Gracias!