A low-power source of energy could put out a lot of work provided ...

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A low-power source of energy could put out a lot of work provided it
 
  A) exerted its power over a very large distance.
  B) operated for a short time.
  C) operated for a long time.
  D) exerted a sufficiently strong force.
  E) Nonsense-- there is no way that a low-power source can put out a large amount of work.

Question 2

It takes 87 J of work to stretch an ideal spring from 1.4 m to 2.9 m from equilibrium. What is the value of the spring constant (force constant) of this spring?
 
  A) 52 N/m B) 77 N/m C) 39 N/m D) 27 N/m

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Answer to Question 1

C

Answer to Question 2

D

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