COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 14, Problem 35QAP
To determine
Which
A.
B.
C.
D. conduction and radiation
E. conduction, radiation, and convection
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Chapter 14 Solutions
COLLEGE PHYSICS
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- Construct Your Own Problem Consider a person outdoors on a cold night. Construct a problem in which you calculate the rate of heat transfer from the person by all three heat transfer methods. Make the initial circumstances such that at rest the person will have a net heat transfer and then decide how much physical activity of a chosen type is necessary to balance the rate of heat transfer. Among the things to consider are the size of the person, type of clothing, initial metabolic rate, sky conditions, amount of water evaporated, and volume of air breathed. Of course, there are many other factors to consider and your instructor may wish to guide you in the assumptions made as well as the detail of analysis and method of presenting your results.arrow_forwardHow can an object transfer heat if the object does not possess a discrete quantity of heat?arrow_forwardThermography is a technique for measuring radiant heat and detecting variations in surface temperatures that may be medically, environmentally, or militarily meaningful.(a) What is the percent increase in the rate of heat transfer by radiation from a given area at a temperature of 34.0C compared with that at 33.0C, such as on a person’s skin? (b) What is the percent increase in the rate of heat transfer by radiation from a given area at a temperature of 34.0C compared with that at 20.0C, such as for warm and cool automobile hoods? Figure 14.35 Artist’s rendition of a thermograph of a patient’s upper body, showing the distribution of heat represented by different colors.arrow_forward
- Compare the SI units of specific heat and latent heat and explain any differences.arrow_forwardHeat always flows spontaneously from an object with a higher temperature to an object with a lower temperature. Is this the same thing as saying that heat always flows from an object with a greater internal energy to one with a lower internal energy? Explain.arrow_forwardA 3.00-g copper coin at 25.0°C drops 77.0 m to the ground. (a)Assuming 61.2% of the change in gravitational potential energy of thecoin goes into increasing the internal energy of the coin, determine thecoin’s final temperature. (b) Does the result depend on the mass of thecoin? Explain. (Specific Heat of Copper is c = 385 J/(kg⋅Karrow_forward
- Is there more than one method of heat transfer? If so, then how are they similar and different than one another?arrow_forwardWhen heat transfers into a system, is the energy stored as heat? Explain briefly.arrow_forwardIf you add boiling water to a cup at room temperature, what would you expect the final equilibrium temperature of the unit to be? You will need to include 1he surroundings as pan of the system. Consider the zeroth law of thermodynamics.arrow_forward
- One winter day, the climate control system of a large university classroom building malfunctions. As a result, 500m3 of excess cold air is brought in each minute. At what rate in kilowatts must heat transfer occur to warm this air by 10.0C (that is, to bring the air to room temperature)?arrow_forwardUnreasonable Results (a) Calculate the rate of heat transfer by conduction through a window with an area of 1.00 m2 that is 0.750 cm thick, if its inner surface is at 22.00C and its outer surface is at 35.00C (b) What is unreasonable about this result? (c) Which premise or assumption is responsible?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
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