A bullet of mass 10 g moving with speed of 9ung y 210 m/s in stopped suddenly. If all its kinetic energy is converter into heat, what is the amount of heat produced in calories? (a) 52.5 x 102 (c) 525 (b) 52.5 x 104 (d) 52.5
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- 2m2 of water is converted into 2050 m3 of steam at atmospheric pressure and 100°C temperature. If 4.0 kg of water converted into steam at atmospheric pressure and 100°C temperature, then how much will be the increase in the internal energy. (The latent heat of vaporization of water is 2.3x106 J/kg . (a) 44x105 (b) 88x105 J (c) 0 (d) 4.4x103 JAccording to the USDA, an average, \moderately active" college student needs to eat 2500 calories per day. These \calories" are actually kilocalories, or kcal; and, we prefer to use Joules (J) in geophysics. The conversion is 1 kcal = 4187 J. The average geothermal heat ux is 60 mW/m2. How large an area on Earth's surface releases the same amount of energy in one day as used by the average college student in a day?The concrete slab of a basement is 11m long, 8 m wide and 0.2 m thick. During the winter, temperatures are nominally 17°C and 10°C at the top and bottom respectively. If the concrete has thermal conductivity of 1.4 W/m K, what is the rate of heat loss through the slab? If the basement is heated by a gas furnace operating at an efficiency of 90% using natural gas priced at Cg = Php 1.00/MJ, what is the daily cost of heat loss?
- The concrete slab of a basement is 11 m long and 8 m wide, and 0.20 m thick. During the winter, temperatures are nominally 17°C and 10°C at the top and bottom surfaces, respectively. If the concrete has a thermal conductivity of 1.4 W/mK, what is the rate of heat loss through the slab? If the basement is heated by a gas furnace operation at an efficiency of 90%, and natural gas is priced at $0.02. MJ, what is the daily cost of the heat loss. Answer: QLOSS = 4.312 kW, COST = $8.28/dayDigestingfat produces 9.3 food calories per gram of fat, and typically 80%of this energy goes to heat when metabolized. (One food calorie is1000 calories and therefore equals 4186 J.) The body then movesall this heat to the surface by a combination of thermal conductivityand motion of the blood. The internal temperature of the body(where digestion occurs) is normally 37 C, and the surface is usuallyabout 30 C. By how much do the digestion and metabolism of a2.50 g pat of butter change your body’s entropy? Does it increase ordecrease?A 25,000 kg subway train initially traveling at 15.5 m/s slows to a stop in a station and the stays there long enoughfor its brakes to cool. The station's dimensions are 65.0 m long by 20.0 m wide by 12.0 m high. Assuming all the work done by the brakes in stopping the train is transferred as heat uniformly to all the air in the station, by how much does the air temperature in the sation rise? Take the density of the air to be 1.20 kg/m3 and its specific heat to be 1020 J/kg*K.
- 2m' of water is converted into 2050 m of steam at atmospheric pressure and 100°C temperature. If 4.0 kg of water converted into steam at atmospheric pressure and 100°C temperature, then how much will be the increase in the internal energy. (The latent heat of vaporization of water is 2.3x10° J/kg. (a) 44x10° J (b) 88×10° J (c) 0 (d) 4.4x10° JThe heat of vaporization of water is 40.7 k/>mol.(a) How much heat (in kilojoules) is required to vaporize3.00 mol of H2O?(b) How much heat (in kilojoules) is released when 320 gof steam condenses?A 4-ton air conditioner removes 5.06×107 J (48,000 British thermal units) from a cold environment in 1.00 h. (a) What energy input in joules is necessary to do this if the air conditioner has an energy efficiency rating ( EER ) of 12.0? (b) What is the cost of doing this if the work costs 10.0 cents per 3.60×106J (one kilowatt-hour)? (c) Discuss whether this cost seems realistic. Note that the energy efficiency rating ( EER ) of an air conditioner or refrigerator is defined to be the number of British thermal units of heat transfer from a cold environment per hour divided by the watts of power input.
- A copper block is removed from 320ºC oven and immediately dropped into 1.75 L of water at 20ºC.in an insulated cup . The water quickly reaches 24ºC and then remains at that temperature. Calculate the following: ) a) Mass of water in grams b) The heat energy supplied to water by the copper block in joules (Sp.Heat of water = 4186 J/kg°C) c) The mass of copper block in grams . (Sp.Heat of copper is 385 J/KgºC) A 700 cm X 1000 cm house is built on a 16.8 cm thick concrete slab of thermal conductivity 0.62 W/m.K.. If the ground temperature of the slab is 4.3ºC while the interior of the house is 26.5ºC. Calculate the following: a) The temperature difference in kelvin b) The temperature gradient (ΔT/Δx) in kelvin/metre c) The heat loss rate through the concrete slab in kilowattDuring a bout with the flu an 80 kg man ran a fever of 39 degreees Celsius instead of normal body temperature of 37 degrees Celsius. Assuming that the human body is mostly water, how much heat is required to raise his temperature by that amount? The answer would be 6.7x10^5. J The question is, if th e person in this example is a terminator machine that is composed of 99.9 % aluminum, how much energy is required to raise his temperature?A 25,000 kg subway train initially traveling at 15.5 m/sslows to a stop in a station and then stays there long enough for itsbrakes to cool. The station’s dimensions are 65.0 m long by 20.0 mwide by 12.0 m high. Assuming all the work done by the brakes in stoppingthe train is transferred as heat uniformly to all the air in the station,by how much does the air temperature in the station rise? Take the densityof the air to be 1.20 kg>m3 and its specific heat to be 1020 J /kg . K.
