Question 1
An 8 000-kg aluminum flagpole 100-m long is heated by the sun from a temperature of 10°C to 20°C. Find the heat transferred (in J) to the aluminum if the specific heat of aluminum is 0.215 cal/g⋅°C.
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7.2 × 105
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7.2 × 107
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7.2 × 103
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7.2 × 101
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7.2 × 102
Question 2
Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. Sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. Which one, if either is correct?
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Beryl, because low thermal conductivity results in low heat transfer.
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Beryl, because low thermal conductivity results in high heat transfer.
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Sapphire, because low thermal conductivity results in low heat transfer.
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Sapphire, because low thermal conductivity results in high heat transfer.
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Neither, because low heat transfer is desirable both in summer and in winter.
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