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Unformatted text preview: s toward you.
D. your body is radiating more heat to the walls than the walls are radiating toward
E. more heat is flowing from the air to the walls than to you. 4 Still air is a very good insulator, and convection requires moving air, not still air. Your
body radiates heat to the walls, but the cold walls radiate less heat back to you. Cold
cannot be radiated, and how much heat flows from the air to the walls is irrelevant to the
(c) [3pt] Which process does not increase the entropy of the system?
A. water evaporating B. a glass shattering C. heat flowing out a window D. adiabatic heating of a gas E. none of the above – they all increase the entropy
The change in entropy is
, and an adiabatic process has
an adiabatic process, D. All of the choices A – C increase entropy. so for (d) [3pt] How much water at 100oC must be poured on 1 kg of ice to just melt all of it?
A. 0.4 L B. 0.8 L C. 1.2 L D. 1.6 L E. 2.0 L The specific heat of water is 1 kcal/kgoC, while the latent heat of fusion is 80 kcal/kg (to
two significant digits), so 80 kcal of heat must be obtained from the water. This requires
0.80 kg of water, which is 0....
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