An isolated air-filled parallel-plate capacitor that is no longer connected to anything has been charged up to Q = 2.9 nC.
The separation between the plates initially is 1.20 mm, and for this separation the capacitance is 31 pF. Calculate the work that must be done to pull the plates apart until their separation becomes 5.30 mm, if the charge on the plates remains constant.
(0 = 8.85 10-12 C2/N m2)
Question 2
If 2.0 g of water at 0.00C is to be vaporized, how much heat must be added to it? The specific heat of water is 1.0 cal/gK, its heat of fusion is 80 cal/g, and its heat of vaporization is 539 cal/g.
A) 1100 kcal B) 1200 cal C) 1500 cal D) 1100 cal E) 1300 cal
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