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A 2.37 m wide by 1.17 m high metal plate must be insulated to prevent contact burn injuries. If the
{kins = 0.036 W/m∙K}
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- (a) If the partial pressure of water vapor is 8.05 torr, what is the dew point? (760 torr = I atm 101, 325 Pa) (b) On a warn day when the air temperature is 35 and the dew point is 25 , what are the partial of the water in the air and the relative humidity?A warms transfers energy by conduction through its blubber at the rate of 150 W when immersed in 1.00 water. The walrus's internal core temperature is 37.0 and it has a surface area of 2.00 m2. What is the average thickness of its blubber, which has the conductivity of fatty tissues without blood?One process for decaffeinating coffee uses carbon dioxide ( M=44.0 g/mol) at a molar density of about 14,0 mol/m3 and a temperature of about 60 . (a) Is CO2 a solid, liquid, gas, or supercritical fluid under those conditions? (b) The van der Waals constants for carbon dioxide are a=0.3658 Pa m6/mol2 and b=4.286105 m3/mol. Using the van der Waals equation, estimate pressure of CO2 at that temperature and density. `
- The thermal conductivities of human tissues vary greatly. Fat and skin have conductivities of about 0.20 W/m K and 0.020 W/m K, respectively, while other tissues inside the body have conductivities of about 0.50 W/m K. Assume that between the core region of the body and the skin sin face lies a skin layer of 1.0 mm, fat layer of 0.50 cm, and 3.2 cm of other tissues. (a) Find the R-factor for each of these layers, and the equivalent R-factor for all layers taken together, retaining two digits. (b) Find the rate of energy loss when the core temperature is 37C and the exterior temperature is 0C. Assume that both a protective layer of clothing and an insulating layer of unmoving air a absent, and a body area of 2.0 m2.Calculate the length of a 1-meter rod of a material with thermal expansion coefficient a when the temperature is raised from 300 K to 600 K. Taking your answer as the new initial length, find the length after the rod is cooled back down to 300 K. Is your answer 1 meter? Should it be? How can you account for the result you got?A construction worker uses a steel tape to measure the length of an aluminum support column. If the measured length is 18.700 m when the temperature is 21.2C, what is the measured length when the temperature rises to 29.4C? Note: Dont neglect the expansion of the tape.
- A 2.44 m wide by 1.15 m high metal plate must be insulated to prevent contact burn injuries. If the heat transfer rate is 125 W and the temperature across the insulation must be reduced from 88.3°C to 40.7°C, what is the minimum thickness (in cm) of insulation required [round your final answer to two decimal places]? {kins = 0.035 W/m-K} Insulation Н W LA walrus transfers energy by conduction through its blubber at the rate of 150 W when immersed in -1.00C water. The walrus’s internal core temperature is 37.0C, and it has a surface area of 2.00m. What is the average thickness of its blubber, which has the conductivity of fatty tissues without blood?An electric kitchen range has a total wall area of 1.40 m2and is insulated with a layer of fiberglass 4.00 cm thick. The insidesurface of the fiberglass has a temperature of 175°C, and its outsidesurface is at 35.0°C. The fiberglass has a thermal conductivity of0.040 W /m . K. (a) What is the heat current through the insulation,assuming it may be treated as a flat slab with an area of 1.40 m2?(b) What electric-power input to the heating element is required tomaintain this temperature?
- Given a cylindrical Cu bar (length L = 4 m, radius, r = 2 cm). One end is kept in a heat bath at 105 °C and the other temperature at 5 °C. The surface of the bar is insulated so that there is negligible heat loss through it. thermal conductivity of copper: kcu = 385 W/m K Calculate the following up to three (3) significant figures: (1) Thermal resistance Rth of the Cu bar, Ans = (2) Conduction heat current HC, Ans = (3) Temperature gradient AT/Ax, Ans = (4) Temperature T of the Cu bar 0.5 m from the hot end, Ans in W in C/m in K/W in CGiven a cylindrical Cu bar (length L = 4 m, radius, r = 2 cm). One end is kept in a heat bath at 105 °C and the other temperature at 5 °C. The surface of the bar is insulated so that there is negligible heat loss through it. thermal conductivity of copper: kcu = 385 W/m K Calculate the following up to three (3) significant figures: (1) Thermal resistance Rth of the Cu bar, Ans = (2) Conduction heat current Hc, Ans = in W in K/W(a) Calculate the rate of heat conduction (in W) through house walls that are 11.5 cm thick and that have an average thermal conductivity twice that of glass wool. Assume there are no windows or doors. The surface area of the walls is 150 m2 and their inside surface is at 20.0°C, while their outside surface is at 5.00°C. 1565.21 (b) How many 1 kW room heaters would be needed to balance the heat transfer due to conduction? (Round your answer to the next whole integer.) 2 1 kW room heaters