What minimum power must be generated if 210 g water (enough for 1 cup of coffee) is to be heated in 14.0 min from 26.0°C to 84.0°C? (1 cal = 4.186 J, the specific heat of water is 4 186 J/kg⋅ °C)
c. frictional processes increase the internal energy of the sandpaper.
23. A solar heated house loses about 5.5 × 107 cal through its outer surfaces on a typical 24-h winter day. What mass of storage rock is needed to provide this amount of heat if it is brought up to initial temperature of 58°C by the solar collectors and the house is maintained at 23°C? (Specific heat of rock is 0.21 cal/g⋅°C.)
In cloud formation, water vapor turns into water droplets which get bigger and bigger until it rains. This will cause the temperature of the air in the clouds to. a. get warmer. 50. I take 2.0 kg of ice and dump it into 2.3 kg of water and, when equilibrium is reached, I have 4.3 kg of ice at 0°C.