How much heat energy is needed to change 10 kg of water at 50C to ...

[bucstennis@aim.com]

How much heat energy is needed to change 10 kg of water at 50C to steam at 120C?
 
  A)
 
  4.2  105 J
 
  B)
 
  2.3  107 J
 
  C)
 
  4.2  106 J
 
  D)
 
  3.6  106 J
 
  E)
 
  2.5  107 J

Question 2

In an effort to loosen the bolt on the wheel of a car, a man with a mass of 70 kg steps on the end of a 50-cm tire iron which is extending horizontally from the bolt. How much torque is he applying to the bolt?
 
  A)
 
  340 N m
 
  B)
 
  14 N m
 
  C)
 
  140 N m
 
  D)
 
  70 N m
 
  E)
 
  35 N m

[potomatos]

Answer to Question 1

E

Answer to Question 2

A

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[potomatos]

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