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The following physics responses are provided by a student and, as such, should be considered in that context. While every effort is made for accuracy, absolute correctness cannot be fully guaranteed.
| C | I | Question | Answer |
|---|---|---|---|
| 11 | A 10-kg piece of aluminum (which has a specific heat of 900 J/kg×°C) is warmed so that its temperature increases by 5.0 C°. How much heat was transferred into it? | 4.5*10^4 J | |
| 11 | A 120-g block of copper is taken from a kiln and quickly placed into a beaker of negligible heat capacity containing 300 g of water. The water temperature rises from 15°C to 35°C. Given cCu = 0.10 cal/g×°C, and cwater = 1.00 cal/g×°C, what was the temperature of the kiln? | 535°C | |
| 11 | A 2.0-m2 Thermopane window is constructed, using two layers of glass 4.0 mm thick, separated by an air space of 5.0 mm. If the temperature difference is 20 C° from the inside of the house to the outside air, what is the rate of heat flow through this window? (Thermal conductivity for glass is 0.84 J/s×m×°C and for air 0.023 4 J/s×m×°C.) | 180 W | |
| 11 | A 2.00-kg copper rod is 50.00 cm long at 23°C. If 40000 J are transferred to the rod by heat, what is its change in length? ccopper = 387 J/kg·°C and acopper = 17*10^-6/°C. | 0.044 cm | |
| 11 | A 3.00-g lead bullet is traveling at a speed of 240 m/s when it embeds in a wood post. If we assume that half of the resultant heat energy generated remains with the bullet, what is the increase in temperature of the embedded bullet? (specific heat of lead = 0.030 5 kcal/kg×°C, 1 kcal = 4 186 J) | 113°C | |
| 11 | A 5-g lead bullet traveling in 20°C air at 300 m/s strikes a flat steel plate and stops. What is the final temperature of the lead bullet? (Assume the bullet retains all heat.) The melting point of lead is 327°C. The specific heat of lead is 0.128 J/g×°C. The heat of fusion of lead is 24.5 J/g. | 327°C | |
| 11 | A 50-g cube of ice, initially at 0.0°C, is dropped into 200g of water in an 80g aluminum container, both initially at 30°C. What is the final equilibrium temperature? (Specific heat for aluminum is 900 J/kg×°C, the specific heat of water is 4186 J/kg×°C, and Lf = 3.33*10^5J/kg. | 9.5°C | |
| 11 | A hot (70°C) lump of metal has a mass of 250 g and a specific heat of 0.25 cal/g×°C. John drops the metal into a 500-g calorimeter containing 75 g of water at 20°C. The calorimeter is constructed of a material that has a specific heat of 0.10 cal/ g×°C. When equilibrium is reached, what will be the final temperature? cwater = 1.00 cal/g×°C. | 37°C | |
| 11 | A machine gear consists of 0.10 kg of iron and 0.16 kg of copper. How much total heat is generated in the part if its temperature increases by 35 C°? (Specific heats of iron and copper are 450 and 390 J/kg×°C, respectively.) | 3800 J | |
| 11 | A metal bar is used to conduct heat. When the temperature at one end is 100°C and at the other is 20°C, heat is transferred at a rate of 16 J/s. If the temperature of the hotter end is reduced to 80°C, what will be the rate of heat transfer? | 12 J/s | |
| 11 | A metal bar is used to conduct heat. When the temperature at one end is 100°C and at the other is 20°C, heat is transferred at a rate of 16 J/s. The bar is then stretched uniformly to twice its original length. If again it has ends at 100°C and 20°C, at what rate will heat be transferred between it ends? | 4 J/s | |
| 11 | A piece of copper of mass 100 g is being drilled through with a 1 /2 " electric drill. The drill operates at 40.0 W and takes 30.0 s to bore through the copper. If all the energy from the drill heats the copper, find the copper's increase in temperature. ccopper = 387 J/kg×°C. | 31.0 C° | |
| 11 | A puddle holds 150 g of water. If 0.50 g of water evaporates from the surface, what is the approximate temperature change of the remaining water? (Lv = 540 cal/g) | -1.8 C° | |
| 11 | A silver bar of length 30 cm and cross-sectional area 1.0 cm2 is used to transfer heat from a 100°C reservoir to a 0°C block of ice. How much ice is melted per second? (For silver, k = 427 J/s×m×°C. For ice, Lf = 334 000 J/kg.) | 0.043 g/s | |
| 11 | A slice of bread contains about 100 kcal. If specific heat of a person were 1.00 kcal/kg·°C, by how many °C would the temperature of a 70.0-kg person increase if all the energy in the bread were converted to heat? | 1.43°C |
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