A thin spherical copper shell of radius 9.5 cm carries an excess ...

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A thin spherical copper shell of radius 9.5 cm carries an excess charge of -4.2 nC. How many excess electrons are on
 
  (a) the outer surface of the shell, and (b) the inner surface? (e = 1.60  10-19 C)

Question 2

A carpenter is driving a 15.0-g steel nail into a board. His 1.00-kg hammer is moving at 8.50 m/s when it strikes the nail. Half of the kinetic energy of the hammer is transformed into heat in the nail and does not flow out of the nail.
 
  What is the increase in temperature of the nail after the three blows that the carpenter needs to drive the nail in completely? The specific heat of steel is 448 J/kg  K.
  A) 3.6 K B) 1.8 K C) 7.7 K D) 8.1 K E) 2.7 K

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Answer to Question 1

(a) 2.60  1010 electrons (b) zero

Answer to Question 2

D

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