If the voltage across a circuit of constant resistance is doubled, the power dissipated by that circuit will
A) be four times as large.
B) be two times as large.
C) decrease to one-half the original power.
D) decrease to one-fourth the original power.
Question 2
An 920-g piece of iron at 100C is dropped into a calorimeter of negligible heat capacity containing 50 g of ice at 0C and 92 g of water, also at 0C.
What is the final temperature of the system? The specific heat of iron is 448 J/kg K, that of water is 4186 J/kg K, and the latent heat of fusion of water is 33.5 104 J/kg.
A) 0C
B) 11C
C) 14C
D) 24C
E) 32C
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