A 15.0-kg block of ice at 0.00C falls into Lake Superior, which ...

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A 15.0-kg block of ice at 0.00C falls into Lake Superior, which is a fresh water lake. The lake water is at 10.0C, and the latent heat of fusion for ice is 3.34  105 J/kg.
 
  Find the change in entropy due to the melting of the ice (a) of the block of ice, (b) of the lake, and (c) of the system consisting of the lake and the ice. (d) Is your answer to part (c) consistent with the reversibility or irreversibility of the melting process?

Question 2

A 120-V rms voltage at 60 Hz is applied across an RC circuit. The rms value of the current in the circuit is 0.60 A, and it leads the voltage by 60. What is the capacitance in this circuit?
 
  A) 17 F B) 16 F C) 15 F D) 14 F E) 13 F

[wuly]

Answer to Question 1

(a) +1.84  104 J/K (b) -1.77  104 J/K (c) +648 J/K
(d) The process is irreversible, so S > 0.

Answer to Question 2

C

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Excellent

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