Per4_exercise - = b E.5 If you stand next to a bonfire that...

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Period 4 Exercise Answers E.1 A practical handle for a hot pan can be made from each of the following EXCEPT a) a poor conductor of heat. b) a thermal insulator. c) plastic. d) wood. e) silver. E.1 = e E.2 In order for thermal energy to be transferred between two blocks of iron, the iron blocks a) must be in contact with each other. b) must have different sizes. c) must have different temperatures. d) cannot be located in a vacuum. e) must have different specific heats. E.2 = c
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E.3 Radiant energy is best absorbed by surfaces that are a) shiny. b) black. c) white. d) smooth. e) silvered. E.3 = b E.4 Warm air rises because a) it is more dense than the surrounding cooler air. b) it is less dense than the surrounding cooler air. c) it is just as dense as the surrounding cooler air but has a larger thermal energy, which forces it up. d) hot objects always rise. e) NONE of the answers is correct. E.4
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Unformatted text preview: = b E.5 If you stand next to a bonfire that is burning in the center of an open area on a calm day, most of the energy transferred to you as heat is transferred via a) conduction through open air. b) convection through open air. c) radiation. d) sublimation. e) diffusion. E.5 = c E.6 The heat flow through a 6 foot by 10 foot brick wall is 4,500 BTU per hour. The temperature on one side of the wall is 75 o F and the temperature on the other side is 50 o F. What is the R-value of the brick? a) 0.11 ft 2 o F hr/BTU b) 0.25 ft 2 o F hr/BTU c) 0.33 ft 2 o F hr/BTU d) 0.85 ft 2 o F hr/BTU e) 1.36 ft 2 o F hr/BTU = = hr / BTU ) T T ( A R cold hot hr / BTU F ft 33 . hr / BTU 500 , 4 ) F 25 ( x ) ft 60 ( o 2 o 2 = E6 = c = hr / BTU 500 , 4 ) F 50 F 75 ( x ) ft 10 x ft 6 ( o o Period 4 Answers E.1 = e E.2 = c E.3 = b E.4 = b E.5 = c E.6 = c...
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This note was uploaded on 06/11/2011 for the course PHYSICS 104 taught by Professor Staff during the Winter '11 term at Ohio State.

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Per4_exercise - = b E.5 If you stand next to a bonfire that...

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