Under what condition can a force act on an object and yet do no ...

[ec501234]

Under what condition can a force act on an object and yet do no work on that object?
 
  A) If the net force on the object is zero.
  B) If the force operates at constant (unchanging) power.
  C) If the object does not move.
  D) If the object moves with no acceleration.
  E) Nonsense--any force on an object must do work on that object.

Question 2

Einstein believed that the principle of relativity should apply to Maxwell's theory of electromagnetism. Which basic principle or law did this lead Einstein to propose?
 
  A) length contraction
  B) the law of inertia
  C) the constancy of lightspeed
  D) the relativity of time
  E) E=mc2

[medine]

Answer to Question 1

C

Answer to Question 2

C

[ec501234]

Both answers were spot on, thank you once again

[medine]

Great! Please up vote