College Physics: A Strategic Approach (4th Edition)
College Physics: A Strategic Approach (4th Edition)
4th Edition
ISBN: 9780134609034
Author: Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher: PEARSON
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Chapter 12, Problem 93GP

A 68 kg woman cycles at a constant 15 km/h. All of the metabolic energy that does not go to forward propulsion is converted to thermal energy in her body. If the only way her body has to keep cool is by evaporation, how many kilograms of water must she lose to perspiration each hour to keep her body temperature constant?

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Overall, 80% of the energy used by the body must be eliminated as excess thermal energy and needs to be dissipated. The mechanisms of elimination are radiation, evaporation of sweat (2,430 kJ/kg), evaporation from the lungs (38 kJ/h), conduction, and convection. A person working out in a gym has a metabolic rate of 2,500 kJ/h. His body temperature is 37°C, and the outside temperature 22°C. Assume the skin has an area of 2.0 m2 and emissivity of 0.97. (o = 5.6696 × 10-8 w/m2 · K4) (a) At what rate is his excess thermal energy dissipated by radiation? (Enter your answer to at least one decimal place.) 1.8e2 W (b) If he eliminates 0.44 kg of perspiration during that hour, at what rate is thermal energy dissipated by evaporation of sweat? (Enter your answer to at least one decimal place.) 3.0e2 W (c) At what rate is energy eliminated by evaporation from the lungs? (Enter your answer to at least one decimal place.) 10.6 W (d) At what rate must the remaining excess energy be eliminated…
Alligators and other reptiles don’t use enough metabolic energy to keep their body temperatures constant. They cool off at night and must warm up in the sun in the morning. Suppose a 300 kg alligator with an early-morning bodytemperature of 25°C is absorbing radiation from the sun at a rate of 1200 W. How long will the alligator need to warm up to a more favorable 30°C? (Assume that the specific heat of the reptilian body is the same as that of the mammalian body.)

Chapter 12 Solutions

College Physics: A Strategic Approach (4th Edition)

Ch. 12 - You need to precisely measure the dimensions of a...Ch. 12 - A common trick for opening a stubborn lid on a jar...Ch. 12 - Prob. 13CQCh. 12 - Materials A and B have equal densities, but A has...Ch. 12 - Prob. 15CQCh. 12 - You need to raise the temperature of a gas by 10C....Ch. 12 - Prob. 18CQCh. 12 - Prob. 19CQCh. 12 - A sample of ideal gas is in a cylinder with a...Ch. 12 - A student is heating chocolate in a pan on the...Ch. 12 - If you bake a cake at high elevation, where...Ch. 12 - Prob. 23CQCh. 12 - Prob. 24CQCh. 12 - Prob. 25CQCh. 12 - Prob. 26CQCh. 12 - Prob. 27CQCh. 12 - Prob. 29CQCh. 12 - Prob. 30MCQCh. 12 - Prob. 31MCQCh. 12 - A gas is compressed by an isothermal process that...Ch. 12 - Prob. 33MCQCh. 12 - Prob. 34MCQCh. 12 - Prob. 35MCQCh. 12 - Prob. 36MCQCh. 12 - Prob. 37MCQCh. 12 - Prob. 38MCQCh. 12 - Prob. 1PCh. 12 - How many grams of water (H2O) have the same number...Ch. 12 - Prob. 3PCh. 12 - How many cubic millimeters (mm3) are in 1 L?Ch. 12 - Prob. 5PCh. 12 - Prob. 6PCh. 12 - Prob. 7PCh. 12 - Prob. 8PCh. 12 - An ideal gas is at 20C. The gas is cooled,...Ch. 12 - An ideal gas at 0C consists of 1.0 1023 atoms. 10...Ch. 12 - An ideal gas at 20C consists of 2.2 1022 atoms....Ch. 12 - Prob. 12PCh. 12 - Prob. 13PCh. 12 - When you stifle a sneeze, you can damage delicate...Ch. 12 - Prob. 15PCh. 12 - Mars has an atmosphere composed almost entirely of...Ch. 12 - Prob. 18PCh. 12 - The lowest pressure ever obtained in a laboratory...Ch. 12 - Prob. 20PCh. 12 - Helium has the lowest condensation point of any...Ch. 12 - Prob. 22PCh. 12 - Prob. 23PCh. 12 - Prob. 24PCh. 12 - Prob. 25PCh. 12 - Prob. 26PCh. 12 - A cylinder contains 3.0 L of oxygen at 300 K and...Ch. 12 - Prob. 28PCh. 12 - 0.10 mol of argon gas is admitted to an evacuated...Ch. 12 - Prob. 30PCh. 12 - 0.10 mol of argon gas is admitted to an evacuated...Ch. 12 - 0.10 mol of argon gas is admitted to an evacuated...Ch. 12 - Prob. 33PCh. 12 - Prob. 34PCh. 12 - Prob. 35PCh. 12 - Prob. 36PCh. 12 - A 1.0 cm3 air bubble is released from the sandy...Ch. 12 - A weather balloon rises through the atmosphere,...Ch. 12 - Prob. 39PCh. 12 - Prob. 40PCh. 12 - Prob. 41PCh. 12 - Prob. 42PCh. 12 - The length of a steel beam increases by 0.73 mm...Ch. 12 - Prob. 44PCh. 12 - The length of a steel beam increases by 0.73 mm...Ch. 12 - At 20C, the hole in an aluminum ring is 2.500 cm...Ch. 12 - The temperature of an aluminum disk is increased...Ch. 12 - Prob. 48PCh. 12 - Prob. 49PCh. 12 - Prob. 50PCh. 12 - a. 100 J of heat energy are transferred to 20 g of...Ch. 12 - Prob. 52PCh. 12 - Prob. 53PCh. 12 - Prob. 54PCh. 12 - Alligators and other reptiles dont use enough...Ch. 12 - Prob. 56PCh. 12 - When air is inhaled, it quickly becomes saturated...Ch. 12 - Prob. 58PCh. 12 - Prob. 59PCh. 12 - What minimum heat is needed to bring 100 g of...Ch. 12 - Brewed coffee is often too hot to drink right...Ch. 12 - Prob. 62PCh. 12 - 30 g of copper pellets are removed from a 300C...Ch. 12 - Prob. 64PCh. 12 - A copper block is removed from a 300C oven and...Ch. 12 - Prob. 66PCh. 12 - If a person has a dangerously high fever,...Ch. 12 - A container holds 1.0 g of argon at a pressure of...Ch. 12 - A container holds 1.0 g of oxygen at a pressure of...Ch. 12 - What is the temperature change of 1.0 mol of a...Ch. 12 - Heating 2.5 mol of neon in a rigid container...Ch. 12 - Prob. 72PCh. 12 - A 1.8-cm-thick wood floor covers a 4.0 m 5.5 m...Ch. 12 - A stainless-steel-bottomed kettle, its bottom 24...Ch. 12 - Seals may cool themselves by using thermal...Ch. 12 - Electronics and inhabitants of the International...Ch. 12 - The glowing filament in a lamp is radiating energy...Ch. 12 - Prob. 78PCh. 12 - If you lie on the ground at night with no cover,...Ch. 12 - Prob. 80PCh. 12 - Prob. 81PCh. 12 - Prob. 82PCh. 12 - Prob. 83GPCh. 12 - Prob. 84GPCh. 12 - Prob. 85GPCh. 12 - Prob. 86GPCh. 12 - Prob. 87GPCh. 12 - A 5.0-m-diameter garden pond holds 5.9 103 kg of...Ch. 12 - James Joule (after whom the unit of energy is...Ch. 12 - Prob. 90GPCh. 12 - Prob. 91GPCh. 12 - Prob. 92GPCh. 12 - A 68 kg woman cycles at a constant 15 km/h. All of...Ch. 12 - Prob. 94GPCh. 12 - Prob. 95GPCh. 12 - Prob. 97GPCh. 12 - Your 300 mL cup of coffee is too hot to drink when...Ch. 12 - A gas is compressed from 600 cm3 to 200 cm3 at a...Ch. 12 - An expandable cube, initially 20 cm on each side,...Ch. 12 - Prob. 101GPCh. 12 - Prob. 102GPCh. 12 - Prob. 103GPCh. 12 - Homes are often insulated with fiberglass...Ch. 12 - The surface area of an adult human is about 1.8...Ch. 12 - Prob. 106MSPPCh. 12 - Prob. 107MSPPCh. 12 - Prob. 108MSPPCh. 12 - Prob. 109MSPPCh. 12 - Prob. 110MSPPCh. 12 - Prob. 111MSPPCh. 12 - Prob. 112MSPP
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