Physics Laboratory Experiments
8th Edition
ISBN: 9781285738567
Author: Jerry D. Wilson, Cecilia A. Hernández-Hall
Publisher: Cengage Learning
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Chapter 18, Problem 2ASA
Is our sense of touch a reliable measure of temperature? Explain.
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Judging from its unit W/m·K, can we define thermal conductivity of a material as the rate of heat transfer through the material per unit thickness per unit temperature difference? Explain.
Question 26
Suppose the sun was twice its current temperature. Recall, the sun is 7 x 105 km in
radius, with a surface temperature of 5800 K., and our distance from the sun is D =
150 million km. Using the equation to model the temperature of the earth,
(sun)1/4 Tsun and remembering you have to work in the absolute temperature
4D²
scale (OK = -273°C), what would happen to the temperature of the earth (in Kelvin
scale)?
It would be a quarter times as hot.
It would twice as hot.
It would be four times as hot.
It would be half as hot.
The temperature of the Sun’s interior is about 107 degrees. Does it matter whether this is degrees Celsius or kelvins? Explain.
Chapter 18 Solutions
Physics Laboratory Experiments
Ch. 18 - Prob. 1ASACh. 18 - Is our sense of touch a reliable measure of...Ch. 18 - How does a liquid-in-glass thermometer operate or...Ch. 18 - What is needed to calibrate a thermometer?Ch. 18 - When a thermometer is placed in a hot substance,...Ch. 18 - Why is water not used for the liquid in a...Ch. 18 - The two common liquids used in liquid-in-glass...Ch. 18 - Prob. 4Q
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- On a nice winter day at the South Pole, the temperature rises to 60°F. What is the approximate temperature in degrees Celsius?arrow_forwardHow much stress is cleated in a steel beam if its temperature changes from 15 to 40 but it cannot expand? For steel, the Young's modulus Y=210109N/m2 from Stress, Strain, and Elastic Modulus (http://cnx.org/content/m58342/latest/#fs-id1163713086230). (Ignore the change in area resulting from the expansion.)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 change in temperature is 2.00C, and the skin area is 1.50m2. 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_forward
- Convert the following to equivalent temperatures on the Celsius and Kelvin scales: (a) the normal human body temperature, 98.6F; (b) the air temperature on a cold day, 5.00F.arrow_forwardWhat are the following temperatures on the Kelvin scale? (a) 68.0 F, an indoor temperature sometimes recommended for energy conservation in winter (b) 134 F, one of the highest atmospheric temperatures ever recorded on Earth (Death Valley, California, 1913) (c) 9890 F, the temperature of the surface of the Sunarrow_forwardCalculate the rate of heat conduction out of the human body, assuming that the core internal temperature is 37.0 , the skin temperature is 34.0 , the thickness of the fatty tissues between the core and the skin averages 1.00 cm, and the surface area is 1.40 m2.arrow_forward
- Compare the SI units of specific heat and latent heat and explain any differences.arrow_forwardAt 25.0 m below the surface of the sea, where the temperature is 5.00C, a diver exhales an air bubble having a volume of 1.00 cm3. If the surface temperature of the sea is 20.0C, what is the volume of the bubble just before it breaks the surface?arrow_forward- (a) Compute the amount of heat needed to raise the temperature of 1 kg of water from its freezing point to its normal boiling point. (b) How does your answer to (a) compare to the amount of heat needed to convert 1 kg of water at 100° C to steam at 100°C?arrow_forward
- A copper rod and an aluminum rod of equal diameter are joined end to end in good thermal contact. The temperature of the free end of the copper rod is held constant at 100.C and that of the far end of the aluminum rod is held at 0C. If the copper rod is 0.15 m long, what must be the length of the aluminum rod so that the temperature at the junction is 50.C?arrow_forwardSuppose a person is covered head to foot by wool clothing with average thickness of 2.00 cm and is transferring energy by conduction through the clothing at the rate of 50.0 W. What is the temperature difference across the clothing, given the surface area is 1.40m2 ?arrow_forwardDuring 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_forward
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Heat Transfer: Crash Course Engineering #14; Author: CrashCourse;https://www.youtube.com/watch?v=YK7G6l_K6sA;License: Standard YouTube License, CC-BY