Conceptual Physics / MasteringPhysics (Book & Access Card)
12th Edition
ISBN: 9780321908605
Author: Paul G. Hewitt
Publisher: PEARSON
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Chapter 16, Problem 65RCQ
What does the high specific heat of water have to do with
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A pond in winter has a layer of ice 5cm thick. The temperature of the air above the ice is -10C and the temperature of the water directly below the ice is 0C.
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(ii) How would the amount of heat transfer differ if the ice were 7.5 cm thick instead of 5 cm thick? (how many times as much or as less)
It is well known that wind makes the cold air feel much colder as a result of the wind chill effect that is due to the increase in the convection heat transfer coefficient with increasing air velocity. The wind chill effect is usually expressed in terms of the wind chill temperature (WCT), which is the apparent temperature felt by exposed skin. For outdoor air temperature of 0°C, for example, the wind chill temperature is 25°C at 20 km/h winds and -9°C at 60 km/h winds. That is, a person exposed to 0°C windy air at 20 km/h will feel as cold as a person exposed to -5°C calm air (air motion under 5 km/h). For heat transfer purposes, a standing man can be modeled as a 30-cm-diameter, 170-cm-long vertical cylinder with both the top and bottom surfaces insulated and with the side surface at an average temperature of 34°C. For a convection heat transfer coefficient of 15 W/m2·K, determine the rate of heat loss from this man by convection in still air at 20°C. What would your answer be if the…
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Chapter 16 Solutions
Conceptual Physics / MasteringPhysics (Book & Access Card)
Ch. 16 - What is the role of “loose” electrons in heat...Ch. 16 - If you touch the metal sides in an oven with your...Ch. 16 - Explain why a firewalker can step quickly without...Ch. 16 - Prob. 4RCQCh. 16 - Does a good insulator prevent heat from escaping...Ch. 16 - Prob. 6RCQCh. 16 - Prob. 7RCQCh. 16 - Prob. 8RCQCh. 16 - Prob. 9RCQCh. 16 - Prob. 10RCQ
Ch. 16 - Prob. 11RCQCh. 16 - Prob. 12RCQCh. 16 - Prob. 13RCQCh. 16 - Prob. 14RCQCh. 16 - Prob. 15RCQCh. 16 - Prob. 16RCQCh. 16 - Prob. 17RCQCh. 16 - Prob. 18RCQCh. 16 - Prob. 19RCQCh. 16 - Prob. 20RCQCh. 16 - Prob. 21RCQCh. 16 - What happens to the temperature of something that...Ch. 16 - Prob. 23RCQCh. 16 - Prob. 24RCQCh. 16 - Prob. 25RCQCh. 16 - Prob. 26RCQCh. 16 - Prob. 27RCQCh. 16 - Distinguish between weather and climate.Ch. 16 - Prob. 29RCQCh. 16 - Cite three ways in which a Thermos bottle inhibits...Ch. 16 - Prob. 31RCQCh. 16 - Prob. 32RCQCh. 16 - Prob. 33RCQCh. 16 - Prob. 34RCQCh. 16 - Prob. 35RCQCh. 16 - Radioactive decay of granite and other rocks in...Ch. 16 - In a 25°C room, hot coffee in a vacuum flask cools...Ch. 16 - At a certain location, the solar power per unit...Ch. 16 - In lab you submerge 100 g of 40°C iron nails in...Ch. 16 - Prob. 40RCQCh. 16 - Prob. 41RCQCh. 16 - Prob. 42RCQCh. 16 - If 70°F air feels warm and comfortable to us, why...Ch. 16 - Prob. 44RCQCh. 16 - Prob. 45RCQCh. 16 - Prob. 46RCQCh. 16 - Prob. 47RCQCh. 16 - Visit a snow-covered cemetery and note that the...Ch. 16 - 49. Why are mittens warmer than gloves on a cold...Ch. 16 - Prob. 50RCQCh. 16 - Prob. 51RCQCh. 16 - Prob. 52RCQCh. 16 - Prob. 53RCQCh. 16 - Prob. 54RCQCh. 16 - Prob. 55RCQCh. 16 - In a mixture of hydrogen and oxygen gases at the...Ch. 16 - Prob. 57RCQCh. 16 - Prob. 58RCQCh. 16 - Prob. 59RCQCh. 16 - Prob. 60RCQCh. 16 - Prob. 61RCQCh. 16 - Prob. 62RCQCh. 16 - Release a single molecule in an evacuated region...Ch. 16 - Prob. 64RCQCh. 16 - What does the high specific heat of water have to...Ch. 16 - Prob. 66RCQCh. 16 - Prob. 67RCQCh. 16 - Prob. 68RCQCh. 16 - Prob. 69RCQCh. 16 - Prob. 70RCQCh. 16 - 71. Why does a good emitter of heat radiation...Ch. 16 - Since energy is radiated by all objects, why can’t...Ch. 16 - Prob. 73RCQCh. 16 - Prob. 74RCQCh. 16 - Prob. 75RCQCh. 16 - Prob. 76RCQCh. 16 - Prob. 77RCQCh. 16 - Prob. 78RCQCh. 16 - On a very cold sunny day, you wear a black coat...Ch. 16 - If the composition of the upper atmosphere were...Ch. 16 - Prob. 81RCQCh. 16 - Make up a multiple-choice question to test a...Ch. 16 - Prob. 83RCQCh. 16 - Prob. 84RCQCh. 16 - If you were caught in freezing weather with only...Ch. 16 - Prob. 86RCQCh. 16 - Prob. 87RCQCh. 16 - Prob. 88RCQCh. 16 - Prob. 89RCQCh. 16 - Prob. 90RCQCh. 16 - Prob. 91RCQCh. 16 - Prob. 92RCQCh. 16 - Prob. 93RCQCh. 16 - Prob. 94RCQCh. 16 - Prob. 95RCQCh. 16 - Prob. 96RCQCh. 16 - Prob. 97RCQCh. 16 - Prob. 98RCQCh. 16 - Prob. 99RCQCh. 16 - Prob. 100RCQ
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- During heavy exercise, the body pumps 2.00 L of blood per minute to the surface, where it is cooled by 2.00C. What is the rate of heat transfer from this forced convection alone, assuming blood has the same specific heat as water and its density is 1050kg/m3 ?arrow_forwardFor the human body, what is the rate of heat transfer by conduction through the body's tissue with the following conditions: the tissue thickness is 3.00 cm, the difference in temperature is 2.00 , and the skin area is 1.50 m2. How does this compare with the average heat transfer rate to the body resulting from an energy intake of about 2400 kcal per day? (No exercise is included.)arrow_forwardA firewalker runs across a bed of hot coals without sustaining burns. Calculate the heat transferred by conduction into the sole of one foot of a firewalker given that the bottom of the foot is a 3.00-mm-thick callus with a conductivity at the low end of the range for wood and its density is 300 kg/m3. The area of contact is 25.0 cm2 the temperature of the coals is 700 , and the time in contact is 1.00 s. Ignore the evaporative cooling of sweat.arrow_forward
- One easy way to reduce heating (and cooling) costs is to add extra insulation in the attic of a house. Suppose a single-story cubical house already had 15 cm of fiberglass insulation in the attic and in all the exterior surfaces. If you added an extra 8.0 cm of fiberglass to the attic, by what percentage would the heating cost of the house drop? Take the house to have dimensions 10 m by 15 m by 3.0 m. Ignore air infiltration and heat loss through windows and doors, and assume that the interior is uniformly at one temperature and the exterior is uniformly at another.arrow_forwardGlider pilots in the Midwest know that thermal updrafts are likely to occur in the vicinity of freshly plowed fields. Why?arrow_forwardSomeone claims that the air space in a double-pane window enhances the heat transfer from a house because of the natural convection currents that occur in the air space and recommends that the double-pane window be replaced by a single sheet of glass whose thickness is equal to the sum of the thicknesses of the two glasses of the double-pane window to save energy. Do you agree with this claim?arrow_forward
- During heavy exercise, the body pumps 2.00 L of blood per minute to the surface, where it is cooled by 2.00ºC . What is the rate of heat transfer from this forced convection alone, assuming blood has the same specific heat as water and its density is 1050 kg/m? (answer in W)arrow_forwardThe coolant in a chemical or a nuclear plant (i.e., the liquid used to prevent the different parts of a plant from getting too hot) should have high specific heat.Why?arrow_forwardAssume that you are evaluating a building that has a heated slab-on-grade floor with edge insulation of R = 5.0 and a perimeter of 1000 ft. If your design temperature range is 5°F to -5°F, what is the heat loss, in BTU/hr, through the edge of the floor? 62,000 BTU/hr 31,000 BTU/hr 47,000 BTU/hr 23,000 BTU/hrarrow_forward
- Water enters the tubes of a cold plate at 70°F with an average velocity of 40 ft/min and leaves at 105°F. The diameter of the tubes is 0.25 in. Assuming 15 percent of the heat generated is dissipated from the components to the surroundings by convection and radiation, and the remaining 85 percent is removed by the cooling water, determine the amount of heat generated by the electronic devices mounted on the cold plate.arrow_forwardStructural groaning noises are sometimes heard in the attic of old buildings on cold nights. Give an explanation in terms of thermal expansion.arrow_forwardName two factors on which the heat energy liberated by a body on cooling depends.arrow_forward
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