A solar heated house loses about 7.4 × 10^7 cal through its outer surfaces on a typical 24-hour winter day. What mass of storage rock is needed to provide this amount of heat if it is brought up to initial temperature of 62°C by the solar collectors, and the house is maintained at 20°C? (Specific heat of rock is 0.21 cal/g • °C.)
a. 160 kg
c. 6100 kg
b. 1200 kg
d. 8400 kg
D
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