An apparatus for measuring the mechanical equivalent of heat uses ...

[Sufayan.ah]

An apparatus for measuring the mechanical equivalent of heat uses a crank to turn a small aluminum cylinder, which is being retarded by a belt.
 
  Friction with the belt heats up the cylinder, and the work done is then set equal to the heat gained by the cylinder. In one such experiment, the radius of the cylinder is 3.00 cm, the tension on one side of the belt is 50.0 N and on the other it is zero N. How much work is done turning the crank 212 times? A) 2000 J
  B) 4000 J
  C) 19600 J
  D) 637 J
  E) 9800 J

Question 2

A key feature of the theory of chaos is
 
  A) unpredictability.
  B) very small initial differences can lead to very large eventual differences.
  C) the randomness of molecular motion makes prediction difficult.
  D) even orderly systems are seen to be disorderly when carefully studied.

[Chocorrol77]

Answer to Question 1

A

Answer to Question 2

Answer: B

[Sufayan.ah]

Excellent

[fatboyy09]

Gracias!