How much water remains unfrozen after 53.0 kJ is transferred as heat from 458 g of liquid water initially at its freezing point? The latent heat of fusion is 333 kJ/kg. Number i Units
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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)Water freezes at 0°C at atmospheric pressure (1.01×10° Pa). The densities of water and ice at this temperature and pressure are 1000kg / m and 934 kg / m respectively. The latent heat of fusion is 3.34x10° J/ kg . The pressure required for increasing the melting temperature of ice by 10°C is... GPa. (up to two decimal places)
- Eggs with a mass of 0.15kg per egg and a constant pressure specific heat of 3.32 kJ/kg-K are cooled from 32C to 10C at the rate of 300 eggs per minute. Compute the rate of heat removal from these eggs in kW. FYI: kW = kilowatt = kJ/sA soup , with temperature of 60 o C is transferred in a cup with total surface area heated of 0.75 m2. The soup has a . What is the is the temperature, in degree Celsius, of the surface of the cup if the heat transfer if 100 W ? ( h = 150 W/m2-K )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.
- Water freezes at 0°C at atmospheric pressure (1.01×105 Pa). The densities of water and ice at this temperature and pressure are 1000 kg/m³ and 934 kg/m³ respectively. The latent heat of fusion is 3.34×105 J/kg . The pressure required for increasing the melting temperature of ice by 10°C is.... GPa. (up to two decimal places)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.The heating element in an electric kettle is rated as 2.0 kW. If the water in the kettle is at 100.0 °C, what volume of water will be converted into steam in one minute? The specific latent heat of vaporization of the water is 2,257,000 J/kg and the3 density of water is 1,000 kg/m .
- Approximately what is the heat of fusion for the substance in kJ/mol?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.100g of water at 25°C is poured into an insulatng cup. 50g of ice at 0°C is added to the water. The water is stirred until the temperature of the water has fallen to 0°C. 18g of ice remains unmelted. The specific heat capacity of water is 4.2J/g°C. Which value does this experiment give for the specific latent heat of fusion of ice?