Explanation Given data: M = 5000 kg and P = 2500 W . Formula used: Write the another expression for heat energy needed to boil ( Q ) . Q = M L v (1) Here, M is the mass, and L v is the heat of vaporization. Write the expression for heat loss ( P ) . P = Q Δ t (2) Here, Δ t is the change in time. Explanation: Substitute 2500 W for P in equation (2), Q Δ t = 2500 W = 2500 J s { ∵ 1 W = 1 J s } Refer TABLE 12.5 in the textbook for Melting and boiling temperature and heats of transformation at standard atmospheric pressure that is at skin temperature of 30 ° C the heat of vaporization of water is L v = 2.4 × 10 6 J kg . Rearrange equation (1). M = Q L v Find kilograms of water must women lose to perspiration each hour ( M Δ t ) . M Δ t = ( Q L v ) Δ t = ( Q Δ t ) L v Substitute 2500 J s for Q Δ t and 2

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 95GP

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To find: How many kilograms of water per hour must be evaporated from an elephant’s skin to keep it at a constant temperature.

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Chapter 12, Problem 94GP

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College Physics: A Strategic Approach (4th Edition)

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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. 13CQ Ch. 12 - Materials A and B have equal densities, but A has...Ch. 12 - Prob. 15CQ Ch. 12 - You need to raise the temperature of a gas by 10C....Ch. 12 - Prob. 18CQ Ch. 12 - Prob. 19CQ Ch. 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. 23CQ Ch. 12 - Prob. 24CQ Ch. 12 - Prob. 25CQ Ch. 12 - Prob. 26CQ Ch. 12 - Prob. 27CQ Ch. 12 - Prob. 29CQ Ch. 12 - Prob. 30MCQ Ch. 12 - Prob. 31MCQ Ch. 12 - A gas is compressed by an isothermal process that...Ch. 12 - Prob. 33MCQ Ch. 12 - Prob. 34MCQ Ch. 12 - Prob. 35MCQ Ch. 12 - Prob. 36MCQ Ch. 12 - Prob. 37MCQ Ch. 12 - Prob. 38MCQ Ch. 12 - Prob. 1P Ch. 12 - How many grams of water (H2O) have the same number...Ch. 12 - Prob. 3P Ch. 12 - How many cubic millimeters (mm3) are in 1 L?Ch. 12 - Prob. 5P Ch. 12 - Prob. 6P Ch. 12 - Prob. 7P Ch. 12 - Prob. 8P Ch. 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. 12P Ch. 12 - Prob. 13P Ch. 12 - When you stifle a sneeze, you can damage delicate...Ch. 12 - Prob. 15P Ch. 12 - Mars has an atmosphere composed almost entirely of...Ch. 12 - Prob. 18P Ch. 12 - The lowest pressure ever obtained in a laboratory...Ch. 12 - Prob. 20P Ch. 12 - Helium has the lowest condensation point of any...Ch. 12 - Prob. 22P Ch. 12 - Prob. 23P Ch. 12 - Prob. 24P Ch. 12 - Prob. 25P Ch. 12 - Prob. 26P Ch. 12 - A cylinder contains 3.0 L of oxygen at 300 K and...Ch. 12 - Prob. 28P Ch. 12 - 0.10 mol of argon gas is admitted to an evacuated...Ch. 12 - Prob. 30P Ch. 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. 33P Ch. 12 - Prob. 34P Ch. 12 - Prob. 35P Ch. 12 - Prob. 36P Ch. 12 - A 1.0 cm3 air bubble is released from the sandy...Ch. 12 - A weather balloon rises through the atmosphere,...Ch. 12 - Prob. 39P Ch. 12 - Prob. 40P Ch. 12 - Prob. 41P Ch. 12 - Prob. 42P Ch. 12 - The length of a steel beam increases by 0.73 mm...Ch. 12 - Prob. 44P Ch. 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. 48P Ch. 12 - Prob. 49P Ch. 12 - Prob. 50P Ch. 12 - a. 100 J of heat energy are transferred to 20 g of...Ch. 12 - Prob. 52P Ch. 12 - Prob. 53P Ch. 12 - Prob. 54P Ch. 12 - Alligators and other reptiles dont use enough...Ch. 12 - Prob. 56P Ch. 12 - When air is inhaled, it quickly becomes saturated...Ch. 12 - Prob. 58P Ch. 12 - Prob. 59P Ch. 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. 62P Ch. 12 - 30 g of copper pellets are removed from a 300C...Ch. 12 - Prob. 64P Ch. 12 - A copper block is removed from a 300C oven and...Ch. 12 - Prob. 66P Ch. 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. 72P Ch. 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. 78P Ch. 12 - If you lie on the ground at night with no cover,...Ch. 12 - Prob. 80P Ch. 12 - Prob. 81P Ch. 12 - Prob. 82P Ch. 12 - Prob. 83GP Ch. 12 - Prob. 84GP Ch. 12 - Prob. 85GP Ch. 12 - Prob. 86GP Ch. 12 - Prob. 87GP Ch. 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. 90GP Ch. 12 - Prob. 91GP Ch. 12 - Prob. 92GP Ch. 12 - A 68 kg woman cycles at a constant 15 km/h. All of...Ch. 12 - Prob. 94GP Ch. 12 - Prob. 95GP Ch. 12 - Prob. 97GP Ch. 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. 101GP Ch. 12 - Prob. 102GP Ch. 12 - Prob. 103GP Ch. 12 - Homes are often insulated with fiberglass...Ch. 12 - The surface area of an adult human is about 1.8...Ch. 12 - Prob. 106MSPP Ch. 12 - Prob. 107MSPP Ch. 12 - Prob. 108MSPP Ch. 12 - Prob. 109MSPP Ch. 12 - Prob. 110MSPP Ch. 12 - Prob. 111MSPP Ch. 12 - Prob. 112MSPP

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How many kilograms of water per hour must be evaporated from an elephant’s skin to keep it at a constant temperature.

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Chapter 12 Solutions