The ground temperature a few meters below the surface is fairly constant throughout the year and is near the average value of the air temperature. In areas in which the air temperature drops very low in the winter, the exterior unit of a heat pump designed for heating is sometimes buried underground in order to use the earth as a thermal reservoir. Why is it worthwhile to bury the heat exchanger, even if the underground unit costs more to purchaseand install than one above ground?

In a game of football outdoors on a cold day, a player will begin to feel exhausted after using approximately 8.0 x 10 J of internal energy. (a) One player, dressed too lightly for the weather, has to leave the game after losing 7.0 x 10° Jof heat. How much work has he done? (b) Another player, wearing clothes that offer better protection against heat loss, is able to remain in the game long enough to do 2.3x 105 J of work. What is the magnitude of the heat that he has lost? (a) Number Units (b) Number Units <.

Identify the different types of heat transfer occurring in the following scenario. There are 4 in total. Sharkeisha went on a camping trip. During the day it was so hot that she got sunburned (1). When it was time to go to her campsite, she noticed smoke in the air (2). Her father had started a fire and she felt (3) the heat as she walked by the fire. In the morning while her mother was cooking breakfast she accidentally touched (4) a hot pan and got burned. Although this was the case she still had a lot of fun on the trip. 1. 2. 3. 4.

Book: Sustainable Energy, Si Edition, 2nd Edition by Richard A. Dunlop Chapter 15 - Problem 6.  Assume that geothermal heat transfer (at least near the surface of the earth) is by conduction through the crust rocks. For an average geothermal heat flow of 0.087 W/m2 and typical thermal gradient of 1008C/km, calculate the thermal conductivity of the rock. Compare with the known thermal conductivities of similar materials given in Chapter 8.

5. A simple pendulum is suspended from the ceiling by means of a string of length 2.15 m long and has a mass of 4.08 kg. You give it a push away from vertical so that it starts swinging with a speed of 2.83 m/s. Due to friction at the pivot point, 1.00 Joule of the pendulums initial kinetic energy is lost as heat during the upward swing. What maximum angle will it reach, with respect to the vertical, before falling back down?      48.6 degrees      42.3 degrees      34.7 degrees      35.9 degrees

A 100-gram apple is dropped off a 200 m high cliff. As it falls its temperature drops by 2.5 °C due to the cool surrounding air. If its heat capacity is 4100 J/(kg.K), determine which is greater, the decrease in potential energy as it moves from the top to bottom of the cliff or the decrease in internal energy.

A wood stove is used to heat a single room. The stove is cylindrical in shape, with a diameter of 40.0 cm and a length of 49.0 cm, and operates at a temperature of 410°F. (σ = 5.6696 10-8 W/m2 · K4, 1 Btu = 1054 J.) (a) If the temperature of the room is 70.0°F, determine the amount of radiant energy delivered to the room by the stove each second if the emissivity is 0.950. W (b) If the room is a square with walls that are 8.00 ft high and 30.0 ft wide, determine the R-value needed in the walls and ceiling to maintain the inside temperature at 70.0°F if the outside temperature is 32.0°F. Note that we are ignoring any heat conveyed by the stove via convection and any energy lost through the walls (and windows!) via convection or radiation. ft2 · °F · h/Btu

You wish to chill 12 cans of soda at 25.0 °C down to 5.0 °C beforeserving them to guests. Each can has a mass of 0.354 kg, and thespecific heat of soda is the same as that of water. (a) How muchthermal energy must be removed in order to chill all 12 cans?(b) If the chilling process requires 4.0 h, what is the average rate(in W) at which thermal energy is removed from the soda?

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The urban heat island effect is often strongest at night when temperatures would typically drop.  What does this indicate about energy transfer and the material used in the building? (a) The material in buildings releases more energy at night than it absorbs during the day (b) The material in buildings absorbs a lot of energy during the day and when it gets colder at night the energy is released back into the cooler air. (c) The material in buildings absorbs energy during the day and releases it because the temperature of the buildings is lower than the cooler air (d) The material in buildings releases a lot of energy into the hot air during the day so at night all of the energy is still there