Essential University Physics: Volume 1 (3rd Edition)
3rd Edition
ISBN: 9780321993724
Author: Richard Wolfson
Publisher: PEARSON
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Chapter 16, Problem 13FTD
Since Earth is exposed to solar
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Example:
A water tank with a wall thickness of 10 mm and a water temperature of 90 "C.)
Calculate the average heat loss per square meter (unit area) if the ambient air temperature is 15 "C.
Take the thermal conductivity coefficient of the wall material 50 W / m C, the water heat-convection
coefficient of 2800 W/m2°Cand the heat-convection coefficient of the ambient air 11 W/m2°C.
Calculate the two temperatures of the wall surfaces.
At night, the surface of the earth cools, mostly by radiation. The surface radiates energy upward; the much cooler sky above radiates much less. Patches of ground under trees can stay warmer, which is why, if you livesomewhere that has cold, clear nights, you may have noticed some mornings when there is frost on open patches of ground but not under trees. Why does being under a tree keep the ground warmer?
Chapter 16 Solutions
Essential University Physics: Volume 1 (3rd Edition)
Ch. 16.1 - Is there (a) no temperature, (b) one temperature,...Ch. 16.2 - A hot rock with mass 250 g is dropped into an...Ch. 16.3 - The figure shows three slabs with the same...Ch. 16.3 - Prob. 16.4GICh. 16.4 - A houses thermostat fails, leaving the furnace...Ch. 16 - If system A is not in thermodynamic equilibrium...Ch. 16 - Does a thermometer measure its own temperature or...Ch. 16 - Compare the relative sizes of the kelvin, the...Ch. 16 - If you put a thermometer in direct sunlight, what...Ch. 16 - Why does the temperature in a stone building...
Ch. 16 - Why do large bodies of water exert a...Ch. 16 - A Thermos bottle consists of an evacuated,...Ch. 16 - Stainless-steel cookware often has a layer of...Ch. 16 - Prob. 9FTDCh. 16 - Prob. 10FTDCh. 16 - Glass and fiberglass are made from the same...Ch. 16 - To keep your hands warm while skiing, you should...Ch. 16 - Since Earth is exposed to solar radiation, why...Ch. 16 - Global warming at Earths surface is generally...Ch. 16 - In its 2014 report, the Intergovernmental Panel on...Ch. 16 - A Canadian meteorologist predicts an overnight low...Ch. 16 - Normal room temperature is 68F. Whats this in...Ch. 16 - Prob. 18ECh. 16 - At what temperature do the Fahrenheit and Celsius...Ch. 16 - The normal boiling point of nitrogen is 77.3 K....Ch. 16 - Prob. 21ECh. 16 - Prob. 22ECh. 16 - Prob. 23ECh. 16 - Whats the specific heat of a material if it takes...Ch. 16 - The average human diet contains about 2000 kcal...Ch. 16 - Prob. 26ECh. 16 - You bring a 350-g wrench into the house from your...Ch. 16 - Prob. 28ECh. 16 - Building heat loss in the United States is usually...Ch. 16 - Find the heat-loss rate through a slab of (a) wood...Ch. 16 - The top of a steel wood stove measures 90 cm by 40...Ch. 16 - Youre a builder whos advising a homeowner to have...Ch. 16 - An 8.0 m by 12 m house is built on a concrete slab...Ch. 16 - Find the -factor for a wall that loses 0.040 Btu...Ch. 16 - Compute the -factors for 1-inch thicknesses of...Ch. 16 - A horseshoe has surface area 50 cm2, and a...Ch. 16 - An oven loses energy at the rate of 14 W per C...Ch. 16 - Youre having your homes heating system replaced,...Ch. 16 - The filament of a 100-W lightbulb is at 3.0 kK....Ch. 16 - A typical human body has surface area 1.4 nr and...Ch. 16 - A constant-volume gas thermometer is filled with...Ch. 16 - A constant-volume gas thermometer is at 55-kPa...Ch. 16 - In Fig. 16.2s gas thermometer, the height h is...Ch. 16 - Prob. 44PCh. 16 - Typical fats contain about 9 kcal per gram. If the...Ch. 16 - A circular lake 1.0 km in diameter is 10 m deep...Ch. 16 - How much heat is required to raise an 800-g copper...Ch. 16 - Initially, 100 g of water and 100 g of another...Ch. 16 - Prob. 49PCh. 16 - Two neighbors return from Florida to find their...Ch. 16 - Prob. 51PCh. 16 - Prob. 52PCh. 16 - Prob. 53PCh. 16 - The temperature of the eardrum provides a reliable...Ch. 16 - Prob. 55PCh. 16 - Your young niece complains that her cocoa, at 90C,...Ch. 16 - A piece of copper at 300C is dropped into 1.0 kg...Ch. 16 - While camping, you boil water to make spaghetti....Ch. 16 - A biology labs walk-in cooler measures 3.0 m by...Ch. 16 - One end of an iron rod 40 cm long and 3.0 cm in...Ch. 16 - Prob. 61PCh. 16 - An electric stove burner has surface area 325 cm2...Ch. 16 - An electric current passes through a metal strip...Ch. 16 - Youre considering purchasing a new sleeping bag...Ch. 16 - A blacksmith heats a 1.1-kg iron horseshoe to...Ch. 16 - Whats the power output of a microwave oven that...Ch. 16 - A cylindrical log 15 cm in diameter and 65 cm long...Ch. 16 - A blue giant star whose surface temperature is 23...Ch. 16 - Prob. 69PCh. 16 - A black wood stove with surface area 4.6 nr is...Ch. 16 - Estimate the average temperature on Pluto,...Ch. 16 - Prob. 72PCh. 16 - Prob. 73PCh. 16 - Prob. 74PCh. 16 - Prob. 75PCh. 16 - In a cylindrical pipe where area isnt constant....Ch. 16 - Prob. 77PCh. 16 - Prob. 78PCh. 16 - Prob. 79PCh. 16 - Use the method outlined in Problem 76 to show that...Ch. 16 - A house is at 20C on a winter night when the...Ch. 16 - A more realistic approach to the solar greenhouse...Ch. 16 - Fiberglass is a popular, economical, and fairly...Ch. 16 - Fiberglass is a popular, economical, and fairly...Ch. 16 - Fiberglass is a popular, economical, and fairly...Ch. 16 - Fiberglass is a popular, economical, and fairly...
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- Give some everyday examples of the transport of heat by convection and by radiation.arrow_forwardIf the air temperature is 20C at sea level, then what is the temperature outside a jet aircraft flying at an altitude of 10,000 m?arrow_forwardHovering over the surface of our skin is a layer of air some 3 millimeters in thickness that acts as a thermal blanket. On a hot day, what effect does a breeze on bare skin have on your skin? What effect does it have on a cold day?arrow_forward
- At night, the surface of the earth cools, mostly by radiation. The surface radiates energy upward; the much cooler sky above radiates much less. Patches of ground under trees can stay warmer, which is why, if you live somewhere that has cold, clear nights, you may have noticed some mornings when there is frost on open patches of ground but not under trees. Why does being under a tree keep the ground warmer?arrow_forwardHow much radiant energy is emitted by one square meter of an object (a) at 77K (b) 300K and (c) 2000K? 1arrow_forwardNortheastern Canada and much of Europe receive about the same amount of sunlight per unit area. Why, then, is Europe generally warmer in the winter?arrow_forward
- Consider a sphere and a cylinder of equal volume made of copper. Both the sphere and the cylinder are initially at the same temperature and are exposed to convection in the same environment. Which do you think will cool faster, the cylinder or the sphere? Why?arrow_forwardExplain why: (a) the earth without its atmosphere would be inhospitably cold(b) heating systems based on circulation of steam are more efficient in warming a building than those based on circulation of hot water.arrow_forwardIn a warm room a naked resting person has a skin temperature of 33°C if the room temperature is 29° C, what is the body surface area if the rate of heat loss due to convection is 43watt and the convection constant K =7.1 watt /m?.K Choose the right answer: 1.8m? 1.5m2 O 1.7m2arrow_forward
- Living creatures generally have a higher temperature than their environment. Explain why this makes sense.arrow_forwardWhat are the following temperatures on the Kelvinscale?(a) 68.0 °F, an indoor temperature sometimesrecommended for energy conservation in winter(b) 134 °F, one of the highest atmospheric temperaturesever recorded on Earth (Death Valley, California, 1913)(c) 9890 °F, the temperature of the surface of the Sunarrow_forwardBermuda is about as far north of the equator as North Carolina, but, unlike North Carolina, it has a subtropical climate year-round. Why is this so?arrow_forward
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