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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The energy involved in a phase change is called the
a. specific heat. b. thermal energy. c. internal energy. d. latent heat.
What does it mean for a physical quantity in a system to be conserved?
a. It is used in the most efficient manner possible. b. It stays in its original state forever. c. The total amount of it in the system stays constant. d. none of the above.
Which of the following has the largest momentum relative to Earth's surface?
A) a tightrope walker crossing Niagara Falls B) a pickup truck speeding along a highway C) a Mack truck parked in a parking lot D) the Science building on campus E) a mouse running across your room
Why are heat transfers and electrical conduction similar?
What will be an ideal response?