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Geologists measure conductive heat flow out of the earth by drilling holes (a few hundred meters deep) and measuring the temperature as a function of depth. Suppose that in a certain location the temperature increases by
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An Introduction to Thermal Physics
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Tutorials in Introductory Physics
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- The average thermal conductivity of the walls (including windows) and roof of a house in the figure shown below is 4.8 10-4 kW/m · °C, and their average thickness is 20.8 cm. The house is heated with natural gas, with a heat of combustion (energy given off per cubic meter of gas burned) of 9,300 kcal/m3. How many cubic meters of gas must be burned each day to maintain an inside temperature of 25.9°C if the outside temperature is 0.0°C? Disregard surface air layers, radiation, and energy loss by heat through the ground. m3 A house has a rectangular base and a roof that peaks along a line above the center of the house and parallel to the length of the house. This roof slopes downward from the peak to each edge at an angle of 37.0° with the horizontal. The length of the front of the house is 10.0 meters. The width of the house is 8.00 meters. The height from the front of the house up to the edge of the roof is 5.00 meters.arrow_forwardA 900 g copper rod at 20 degrees celcius has a length of 1.0000 m. The thermal expansion coefficient of copper is 17 x 10^-6 degrees celcius -1. The specific heat capacity is 0.385 kJ/kg degrees celcius. Question A: The copper is heated to 400 degrees celcius. What is the new length? Give the answer in meters and with 4 digits of precision after the decimal. Question B: The hot copper is then quenched by dunking the entire rod in a bucket with 10 kg of water at 20 degrees celcius. The specific heat capaciy of water is 4.18 kJ/kg degrees celcius. If none of the water turns to steam what is the equilibrium temp of the copper rod and water? Please give the answer in degrees celcius Question C: You measure the equilbrium temp and find that it is 24 degrees celcius. If the latent heat of vaporization of water is 2,260 kJ/kg, what mass of water turned to steam? Answer in gramsarrow_forwardThe figure shows the cross section of a wall made of three layers. The thicknesses of the layers are L1, L2 =0.800 L1, and L3 = 0.250 L1. The thermal conductivities are k1, k2 = 0.880 k1, and k3 = 0.660 k1. The temperatures at the left and right sides of the wall are TH = 22˚C and TC = -15 ˚C, respectively. Thermal conduction is steady.(a) What is the temperature difference ΔT2 across layer 2 (between the left and right sides of the layer)?If k2 were, instead, equal to 1.140 k1,(b) would the rate at which energy is conducted through the wall be greater than, less than, or the same as previously,and(c) what would be the value of ΔT2?arrow_forward
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