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- An infrared heater for a sauna has a surface area of 0.050 m2 and an emissivity of 0.84. What temperature must it run at if the required power is 360 W? Neglect the temperature of the environment.A 0.250-kg aluminum bowl holding 0.800 kg of soup at 25.0 is placed in a freezer. What is the final temperature if 388 kJ of energy is transferred from the bowl and soup, assuming the soup's thermal properties are the same as that of water?(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?
- When our bodies get too warm, they respond by sweating and increasing blood circulation to the surface to transfer thermal energy away from the core. What effect will those processes have on a person in a 40.0 hot tub?Confirm that the units nRT of are those of energy for each value of R : (a) 8.31 J/mol.K, (b) 1.99 cal/mol.K, and (c) 0.0821 L. atm/mol).K.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 L
- afcopper whe (aae.0068) is conneeteed to a 12 volt batt ery at z08 aned contaret cuttent ef aýs A at pew temperatute the same wive contacts a cuYtent ofO.41A (A)is the new bempera ture. than 20°C (3) what the new tepmperature. highel ex LowerA 50- cm - diamc tor pipeline in the Arctic carrics hot oil whcre the outor surfaco is mai ntained a 30°c and isr exposed to a surrounding tompera turc - IS C. A s pecial powder incu lation of thic k cm surrounds the pipe and has a the rmal conductivity 7mW/m°c . Of the conve ction heat - transfer coeffierent outsidu the of the pipc On 9 W /m °C. Estimate ene rgy las s from the pipe the per mcter of leng th .Hi there! Can you help em figure this problem. I keep gettign 707 watts and that is not correct. Seals may cool themselves by using thermal windows, patches on their bodies with much higher than average surface temperature. Suppose a seal has a 0.030 m2 thermal window at a temperature of 30∘C. If the seal's surroundings are a frosty -15 ∘C, what is the net rate of energy loss by radiation? Assume an emissivity equal to that of a human. Express the answer in watts. Thank you for the help! It is appreicated.
- Two identical long, thin, solid cylinders are used to conduct heat from a reservoir at temperature Thot to a reservoir at temperature Tcold . Originally the cylinders are connected in series and the rate of heat transfer is H. If the cylinders are connected in parallel instead, then what would be the rate of heat transfer?Conduction Homewor l The inside.of house is 3o'c. The at your 5°C, You have e wall this he Up outside an f which is- 3mxYm 30em against the vall is some insulation thish. 6iven that the conduefin; fy of the wall is 300%K ead so ¾K, calaulete aceé he which is the insulation between the layers béat trans fer rate through the system, is Ts T= 30Calculate ∆S when 1 kg of copper at 100oC is placed in 2 kg of water at 0oC in an insulated container at pressure of 1 atm. Given that : Cpcu = 0.1 , CpH2O = 1 J/g.K
