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heat transfer and the microscopis model

# heat transfer and the microscopis model - Cd?“ PHYSICS...

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Unformatted text preview: Cd?“ PHYSICS 116 CYCLE 6 \. WT} g _ ovpsvﬁ/ MAR-YPROBLEMS HEAT 1 ’i fa ii f 3/5 1. Speciﬁc and Latent Heats 1) During a study break, a 64-kg student repeatedly lifts a 5%?! 0.80 m ﬁ'om her chest to an extended position above her head. If her body retains 10‘] of thermal energy for each joule of work done while lifting, how many times must she lift the barbell to warm her body 0.50 C"? State any assumptions you used. List all physics ideas that you used to solve this problem. &ﬂ%/:;7 %%% RN> @ﬁﬂ:?/ —”’?§°@ {ii A 0.15 kg 1ce cube at 0° C (heat of fusio of ice is 3 4 kJ/kg) IS placed in a Styrofoam cup «r §\$containing O 80 kg of water at 20° C (speciﬁc heat of water is 4186 J/kg C° Determine the ﬁnal temperature. Consider all of the heat exchange processes that take place, think about evegthing that happens. ATayan MGM'J- ML =(/Vzc4’(—_)’._ m + (Olsexmt (ﬂSX‘l/wxsﬂ ‘ .zgfotltax 50100 __/ (3%76 GMT} 9 9 WW II. Hail Intensity Index You’re on a team of scientists studying the effects of severe weather on food crops. In order to provide a useful early warning system to farmers, your team is devising an index that characteﬁzgglrow intense a hailstorm will be. was», N 4 1 5‘; 52"”; = ‘3‘": Some storms are severe enough to destroy entire crop beds (see computers): hﬂpﬂwwwyoutube. com/watch ?v=OFv2W7Dugiw Storms summarized in the same row of the data table had the same intensity. Different rows represent storms that had different (and increasing) intensities. Note that the measurements were made using detectors with speciﬁed surface area. There are two factors that contribute to the hail intensity: ' how frequently the crops were hit by bail and ' how ii’iuch impulse each hailstone exerted on the plant (assume the plant stopped the hailstone) _ fan yep quantify those two factors then use them to create a hail intensity index that is the same \affor both storms in each row? New Mexico ~ HAIL ‘\ " or ., INTENSITY ‘5 INDEX in '0 O Q J I C} . 3‘ . ﬂ ”9 '- . . a ‘4 . I} w' , '6 ﬂ :7» #hailstones = 1200 mass of hailstones = 0.5 kg #hailstones = 2250 mass of hailstones = 0.2 kg collection time = 1 s speed of hailstones = 0.2 m/s collection time = 2 3 speed of hailstones = 0.4 m/s detector size = 1.5 m2 #hailstones = 2500 mass of hailstones = 0.7 kg #hailstones =750 mass of hailstones =0.4 kg collection time = 5 s speed of hailstones = 0.3 m/s - collection tirne = 1 5 speed of hailstones = .5 m/s detector size = 1.4 m2 detector size: 2 m2 #hailstones = 410 mass of hailstones = 0.6 kg #hailstones = 1845 mass of hailstones = 0.5 kg collection time = l 5 speed of hailstones = 0.4 m/s collection time = 5 5 speed of hailstones = 0.8 m/s detector size = 1.2 m2 detector size = 1.8 m2 ...
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heat transfer and the microscopis model - Cd?“ PHYSICS...

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