How much water remains unfrozen after 61.8 kJ is transferred as heat from 489 g of liquid water initially at its freezing point? The latent heat of fusion is 333 kJ/kg. Number Units
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A: Formula required:
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- Even when shut down after a period of normal use, a large commercial nuclear reactor transfers thermal energy at the rate of 150 MW by the radioactive decay of fission products. This heat transfer causes a rapid increase in temperature if the cooling system fails (1 watt = 1 joule/second or 1 W = 1 J/s and 1 MW = 1 megawatt). (a) Calculate the rate of temperature increase in degrees Celsius per second (C/s) if the mass of the is 1.60105 kg and it has an average specific heat of 0.3349 kJ/kg . C. (b) How long would it take to obtain a temperature increase of 2000 C, which could cause some metals holding the radioactive materials to melt? (The initial rate of temperature increase would be greater than that calculated here because the heat transfer is concentrated in a smaller mass. Later, however, the temperature increase would slow down because the 500,000-kg steel containment vessel would also begin to heat up.)During a bout with the flu an 80-kg person ran a fever of 39 oC. Consider that the specific heat of any human body is 3470 J/kg K, how much energy does the body need to burn to reach the fever temperature? The answer (in fundamental SI unit) is ___________ (type the numeric value only, dont use scientific notation)How much heat energy needs to be given up to freeze 2.12 kg of milk if initially the milk was at the room temperature 20 oC? Assume that the latent heat of fusion of milk is 275700 J/kg, and the specific heat of milk is 3890 J/kgoC.
- During a bout with the flu an 80-kg person ran a fever of 39 oC. Consider that the specific heat of any human body is 3470 J/kg K, how much energy does the body need to burn to reach the fever temperature?why does the specific heat of water still 4.184 from the unit kj/kg K to j/kg K?Q.1/If you have 100 gm of ice at Oc, how much energy you need to convert this ice to water vapor at 100c? Knowing that the latent heat of fusion is79.9cal/gm and specific heat capacity of water is 1cal/gm.c, latent heat of water vaporization is 540cal/gm.
- Approximately what is the heat of fusion for the substance in kJ/mol?How many kilograms of water is needed to raise its temperature by 25C when energy expense is 3.9x10^4 J Answer using the G.U.E.S.S MethodAn incandescent lamp filament, with a surface area of 100 mm2, operates at a temperature of 2300 0 Assume that the filament acts like a blackbody. What is the rate of radiation from the filament? If the walls of the room in which the lamp operates are at 27 0C, what is the rate at which the filament absorbs radiation? At what rate does electrical energy have to supplied tot eh filament to keep its temperature constant? Ignore conduction and convection losses from the filament
- Q.2/A thermocole cubical ice box of side 30 cm has a thickness of 5.0 cm. If 4.0 kg of ice is put in the box, estimate the amount of ice remaining after 6h. The outside temperature is 45C, and thermal conductivity of thermocole box is 0.01 Js'm k, knowing thatilatent heat of fusion is 335* 10 J/kg.A cube of steel is heated from 70 oF to 400 oF. If each side of the cube is 3.5 in, how much energy is required? Express this quantity in units of kJ. Use 7.85 for the specific gravity of steel and 0.466 J/(g oC) for the specific heat capacity.Metabolizing 1.0 kg of 3.7 x 107J fat results in about ofinternal energy in the body. (a) In one day, how much fatdoes the body burn to maintain the body temperature of aperson staying in bed and metabolizing at an average rateof 95 W? (b) How long would it take to burn 1.0 kg of fatthis way assuming there is no food intake?