Seals may cool themselves by using thermal windows, patches on their bodies with much higher than average surface temperature. Suppose a seal has a 0.030 m 2 thermal window at a temperature of 30°C. If the seal's surroundings are a frosty –10°C, what is the net rate of energy loss by radiation ? Assume an emissivity equal to that of a human.
Seals may cool themselves by using thermal windows, patches on their bodies with much higher than average surface temperature. Suppose a seal has a 0.030 m 2 thermal window at a temperature of 30°C. If the seal's surroundings are a frosty –10°C, what is the net rate of energy loss by radiation ? Assume an emissivity equal to that of a human.
Seals may cool themselves by using thermal windows, patches on their bodies with much higher than average surface temperature. Suppose a seal has a 0.030 m2 thermal window at a temperature of 30°C. If the seal's surroundings are a frosty –10°C, what is the net rate of energy loss by radiation? Assume an emissivity equal to that of a human.
A certain brand of freezer is advertised to use 730 kW h of energy per year.
Part A
Assuming the freezer operates for 5 hours each day, how much power does it require while operating?
Express your answer in watts.
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Part B
W
If the freezer keeps its interior at a temperature of -6.0° C in a 20.0° C room, what is its theoretical maximum
performance coefficient?
Enter your answer numerically.
K =
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Part C
What is the theoretical maximum amount of ice this freezer could make in an hour, starting with water at 20.0°C?
Express your answer in kilograms.
m =
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Describe the development of rational choice theory in sociology.
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