Conceptual Physics (12th Edition)
12th Edition
ISBN: 9780321909107
Author: Paul G. Hewitt
Publisher: PEARSON
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Chapter 17, Problem 53RCQ
Does a common electric fan cool the air in a room? If not, then then why is it used in an overly warm room?
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Chapter 17 Solutions
Conceptual Physics (12th Edition)
Ch. 17 - Prob. 1RCQCh. 17 - Do the molecules in a liquid all have about the...Ch. 17 - What is evaporation?Ch. 17 - What is evaporation a cooling process?Ch. 17 - What is sublimation?Ch. 17 - Prob. 6RCQCh. 17 - Why is a steam burn more damaging than a burn from...Ch. 17 - Why do you feel uncomfortably warm on a hot and...Ch. 17 - Distinguish between humid and relative humidity.Ch. 17 - Why does water vapor in the air condense when the...
Ch. 17 - Why does warm, moist air from clouds when it...Ch. 17 - What is the basic difference between a cloud and...Ch. 17 - Distinguish between evaporation and boiling.Ch. 17 - Does increased atmospheric pressure increase or...Ch. 17 - Is it the boiling of water or the higher...Ch. 17 - Why doesn’t the water at the bottom of geyser boil...Ch. 17 - What happens to the water pressure at the bottom...Ch. 17 - Why doesn’t energy added to boiling water increase...Ch. 17 - When will water boil at a temperature lower...Ch. 17 - Prob. 20RCQCh. 17 - Why does increasing the temperature of a solid...Ch. 17 - Why does decreasing the temperature of a liquid...Ch. 17 - Why doesn’t water freeze at 00C when foreign ions...Ch. 17 - What happens to the hexagonal open structure of...Ch. 17 - Why doesn’t wire simply cut a block of ice in two...Ch. 17 - Does a liquid release energy or absorb energy when...Ch. 17 - Prob. 27RCQCh. 17 - Does the heat that is discharge at the...Ch. 17 - How many calories are needed to change the...Ch. 17 - Cite two reasons why firewalkers don’t burn their...Ch. 17 - Place a Pyrex funnel mouth-down in a saucepan full...Ch. 17 - Prob. 32RCQCh. 17 - Prob. 33RCQCh. 17 - Prob. 34RCQCh. 17 - Prob. 35RCQCh. 17 - Prob. 36RCQCh. 17 - The quantity of heat with temperature change is...Ch. 17 - Prob. 38RCQCh. 17 - Prob. 39RCQCh. 17 - Consider 50g of hot water at 800C poured into a...Ch. 17 - 50g chunk of 800C iron is dropped into a cavity in...Ch. 17 - Prob. 42RCQCh. 17 - Prob. 43RCQCh. 17 - 44. The heat of vaporization of ethyl alcohol is...Ch. 17 - Rank the boiling water temperatures from highest...Ch. 17 - From greatest to least, rank the energies needed...Ch. 17 - When you step out of a swimming pool on a hot, dry...Ch. 17 - Why is sweating an efficient mechanism for cooling...Ch. 17 - Why does blowing over hot soup cool the soup?Ch. 17 - What happens to the temperature of a pan of water...Ch. 17 - What is the source of energy that keeps the...Ch. 17 - An inventor claims to have developed a new perfume...Ch. 17 - Does a common electric fan cool the air in a room?...Ch. 17 - Prob. 54RCQCh. 17 - Prob. 55RCQCh. 17 - Prob. 56RCQCh. 17 - 57. Why are icebergs often surrounded by fog?
Ch. 17 - Prob. 58RCQCh. 17 - Prob. 59RCQCh. 17 - Prob. 60RCQCh. 17 - Prob. 61RCQCh. 17 - Prob. 62RCQCh. 17 - 63. A great amount of water vapor changes phase to...Ch. 17 - 64. Why does the temperature of boiling water...Ch. 17 - Prob. 65RCQCh. 17 - Prob. 66RCQCh. 17 - Prob. 67RCQCh. 17 - Prob. 68RCQCh. 17 - 69. Water will boil spontaneously in a vacuum—on...Ch. 17 - Prob. 70RCQCh. 17 - Prob. 71RCQCh. 17 - Prob. 72RCQCh. 17 - 73. If water that boils due to reduced pressure in...Ch. 17 - Prob. 74RCQCh. 17 - Prob. 75RCQCh. 17 - Prob. 76RCQCh. 17 - Prob. 77RCQCh. 17 - Prob. 78RCQCh. 17 - Prob. 79RCQCh. 17 - Prob. 80RCQCh. 17 - Prob. 81RCQCh. 17 - Prob. 82RCQCh. 17 - Prob. 83RCQCh. 17 - Prob. 84RCQCh. 17 - Prob. 85RCQCh. 17 - Prob. 86RCQCh. 17 - Prob. 87RCQCh. 17 - Prob. 88RCQCh. 17 - Prob. 89RCQCh. 17 - Prob. 90RCQCh. 17 - 91.Why is half-frozen fruit punch always sweeter...Ch. 17 - Prob. 92RCQCh. 17 - Prob. 93RCQCh. 17 - Prob. 94RCQCh. 17 - Prob. 95RCQCh. 17 - Prob. 96RCQCh. 17 - Prob. 97RCQCh. 17 - Prob. 98RCQCh. 17 - Prob. 99RCQCh. 17 - Prob. 100RCQCh. 17 - Prob. 101RCQCh. 17 - Prob. 102RCQCh. 17 - Prob. 103RCQCh. 17 - Prob. 104RCQCh. 17 - 105. When can you add heat to something without...Ch. 17 - Prob. 106RCQCh. 17 - 107. When can you withdraw heat from something...Ch. 17 - Discuss why water can issue from deep underwater...Ch. 17 - Prob. 109RCQCh. 17 - Prob. 110RCQ
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- (a) The inside of a hollow cylinder is maintained at a temperature Ta, and the outside is at a lower temperature, Tb (Fig. P19.45). The wall of the cylinder has a thermal conductivity k. Ignoring end effects, show that the rate of energy conduction from the inner surface to the outer surface in the radial direction is dQdt=2Lk[TaTbln(b/a)] Suggestions: The temperature gradient is dT/dr. A radial energy current passes through a concentric cylinder of area 2rL. (b) The passenger section of a jet airliner is in the shape of a cylindrical tube with a length of 35.0 m and an inner radius of 2.50 m. Its walls are lined with an insulating material 6.00 cm in thickness and having a thermal conductivity of 4.00 105 cal/s cm C. A heater must maintain the interior temperature at 25.0C while the outside temperature is 35.0C. What power must be supplied to the heater? Figure P19.45arrow_forwardUnreasonable Results A meteorite 1.20 cm in diameter is so hot immediately after penetrating the atmosphere that it radiates 20.0 kW of power. (a) What is its temperature, if the surroundings are at 20.0C and it has an emissivity of 0.800? (b) What is unreasonable about this result? (c) Which premise or assumption is responsible?arrow_forwardAn aluminum rod 0.500 m in length and with a cross-sectional area of 2.50 cm2 is inserted into a thermally insulated vessel containing liquid helium at 4.20 K. The rod is initially at 300 K. (a) If one-half of the rod is inserted into the helium, how many liters of helium boil off by the time the inserted half cools to 4.20 K? Assume the upper half does not yet cool. (b) If the circular surface of the upper end of the rod is maintained at 300 K, what is the approximate boil-off rate of liquid helium in liters per second after the lower half has reached 4.20 K? (Aluminum has thermal conductivity of 3 100 W/m K at 4.20 K; ignore its temperature variation. The density of liquid helium is 125 kg/m3.)arrow_forward
- A certain steel railroad rails 13 yd in length and weighs 70.0 lb/yd How much thermal energy is required to increase the length of such a rail by 3.0 mm? .Note: Assume the steel has the same specific heal as iron.arrow_forwardThe measurement of the average coefficient of volume expansion for a liquid is complicated because the container also changes size with temperature. Figure P19.62 shows a simple means for measuring despite the expansion of the container. With this apparatus, one arm of a U-tube is maintained at 0C in a water-ice bath, and the other arm is maintained at a different temperature Tc in a constant-temperature bath. The connecting tube is horizontal. A difference in the length or diameter of the tube between the two arms of the U-tube has no effect on the pressure balance at the bottom of the tube because the pressure depends only on the depth of the liquid. Derive an expression for for the liquid in terms of h0, hi and Tc.arrow_forwardEqual masses of substance A at 10.0C and substance B at 90.0C are placed in a well-insulated container of negligible mass and allowed to come to equilibrium. If the equilibrium temperature is 75.0Q which substance has the larger specific heat? (a) substance A (b) substance B (c) The specific heats are identical. (d) The answer depends on the exact initial temperatures. (e) More information is required.arrow_forward
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