A bullet of mass 10 g moving with speed of 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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- Consider the latent heat of fusion and the latent heat of vaporization for H2O, 3.33 105 J/kg and 2.256 106 J/kg, respectively. How much heat is needed to a. melt 2.00 kg of ice and b. vaporize 2.00 kg of water? Assume the temperatures of the ice and steam are at the melting point and vaporization point, respectively. (a). UsingEq21.9, Q = mLF = (2.00 kg) (3.33l05 J/kg) = 6.66105 J (b).UsingEq21.10. Q = mLV = (2.00kg) (2.256106 J/kg) = 14.51106 JOne of a dilute diatomic gas occupying a volume of 10.00 L expands against a constant pressure of 2.000 atm when it is slowly heated. If the temperature of the gas rises by 10.00 K and 400.0 J of heat are added in the process, what is its final volume?A Carnot refrigerator exhausts heat to the air, which is at a temperature of 25 . How much is used by the refrigerator if it freezes 1.5 g of water per second? Assume the water is at 0 .
- . A bullet of mass 10 g moving with speed of 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) 52.5According 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?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 J
- During 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?Digestingfat 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 37C, and the surface is usuallyabout 30C. By how much do the digestion and metabolism of a2.50 g pat of butter change your body’s entropy? Does it increase ordecrease?The 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 gasoline engine has a power output of 170 kW (about 2.28×105 hp ). Its thermal efficiency is 22.0 %. How much heat must be supplied to the engine per second? Express your answer in joules per second. How much heat is discarded by the engine per second? Express your answer in joules per second.That same 0.005 kg is dropped off of the top of the Empire State building, which is about 443 meters tall. It hits the ground only going 5.28 m/s. How much energy, in J, was converted to heat as it fell? Round to two significant figures.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 kilowatt