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Pave It Over Suppose city 1 leaves an entire block (100 m × 100 m) as a park with trees and grass (emissivity 0.96) while city 2 paves the same area over with asphalt (emissivity 1.0). Sunlight heats each surface to 40.0 °C by sunset, and then the surface
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- (a) What is the rate of heat conduction through the 3.00-cm-thick fur of a large animal having a I .40-m surface area? Assume that the animal's skin temperature is 32.0 , that the air temperature is 5.00 , and that has the same thermal conductivity as air. (b) What food intake will the animal need in one day to replace this heat transfer?arrow_forwardDuring heavy exercise, the body pumps 2.00 L of blood per minute to the surface, where it is cooled by 2.00C. What is the rate of heat transfer from this forced convection alone, assuming blood has the same specific heat as water and its density is 1050kg/m3 ?arrow_forwardOne easy way to reduce heating (and cooling) costs is to add extra insulation in the attic of a house. Suppose the house already had 15 cm of fiberglass insulation in the attic and in all the exterior surfaces. If you added an extra 8.0 cm of fiberglass to the attic, then by what percentage would the heating cost of the house drop? Take the single story house to be of dimensions 10 m by 15 m by 3.0 m. Ignore air infiltration and heat loss through windows and doors.arrow_forward
- A granite ball of radius 2.00 m and emissivity 0.450 is heated to 135C. (a) Convert the given temperature to Kelvin. (b) What is the surface area of the ball? (c) If the ambient temperature is 25.0C, what net power does the ball radiate?arrow_forwardA cabin has a 0.159-m thick wooden floor [k = 0.141 W/(m · C°)] with an area of 13.4 m². A roaring fire keeps the interior of the cabin at a comfortable 18.0 °C while the air temperature in the crawl space below the cabin is -16.4 °C. What is the rate of heat conduction through the wooden floor?arrow_forwardA ceiling area of 100 square meters consisting of four materials. The thermal insulation value of these materials from top to bottom is (0.6, 50, 0.7 and 0.45) square meters per watt per degree, respectively. If the external temperature is 5 degrees and the internal temperature is 20 degrees, what What is the speed of heat transfer through the wall?arrow_forward
- Suppose you stand with one foot on ceramic flooring and one foot on a wool carpet, making contact over an area of 80 cm² with each foot. Both the ceramic and the carpet are 1.9 cm thick and are 8 deg C on their bottom sides. At what rate must heat transfer occur from each foot to keep the top of the ceramic and carpet at 35 deg C? The thermal conductivity of carpet k =0.04 J/(s m °C) The thermal conductivity of ceramic k =0.84 J/(s m °C) Rate of Heat Transfer of Wool Qw 9.44 t ✓ W Rate of Heat Transfer of Cermaic Qc = 0.4 t ! No, that's not the correct answer. Warrow_forwardSuppose you stand with one foot on ceramic flooring and one foot on a wool carpet, making contact over an area of 80 cm² with each foot. Both the ceramic and the carpet are 1.9 cm thick and are 8 deg C on their bottom sides. At what rate must heat transfer occur from each foot to keep the top of the ceramic and carpet at 35 deg C? The thermal conductivity of carpet k =0.04 J/(s m °C) The thermal conductivity of ceramic k =0.84 J/(s m º°C) Rate of Heat Transfer of Wool = 0.04547 t W Rate of Heat Transfer of Cermaic Qc 0.5657 t ✓ W No, that's not the correct answer.arrow_forwardA cube chamber furnace is receiving 340 kW heat from its bottom surface. The temperature of upper surface and side surfaces is 427 and 177 °C. The emissivity of bottom surface is 0.9 and it is 1 for side surfaces. The volume of furnace is 27 m³. a) Evaluate the emissivity of the top surface. b) Estimate the net rates of heat transfer between the top and the bottom surfaces. c) Investigate the net rates of heat transfer between the bottom and side surfaces.arrow_forward
- On a hot day, the temperature of an 80,000- L swimming pool increases by 1.50 °C . What is the net heat transfer during this heating? Ignore any complications, such as loss of water by evaporation.arrow_forwardB- Calculate the heat flow through a surface of 2500 cm? of mineral wool insulation, with 7 cm thick, the temperature on the tow side of the surface are 60° and 212° Fahrenheit. Note h. for the mineral wool is 0.04 (w/m °C).arrow_forwardAn electric kitchen range has a total wall area of 1.40 m2 and is insulated with a layer of fiberglass 4.0 cm thick. The inside surface of the fiberglass has a temperature of 175 degrees C and its outside surface is at 35 degrees C. The fiberglass has a thermal conductivity of 0.040 W/(m*K). What is the heat current through the insulation, assuming it may be treated as a flat slab with an area of 1.40 m2? What electric-power input to the heating element is required to maintain this temperature?arrow_forward
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