College Physics
College Physics
10th Edition
ISBN: 9781285737027
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Chapter 11, Problem 6P

(a)

To determine

The amount of joules of energy that are equivalent of one jelly doughnut.

(b)

To determine

The number of stairs climbed to convert the food energy to equivalent mechanical energy.

(c)

To determine

The number of stairs climbed to convert the food energy to equivalent mechanical energy if the body is 25% efficient.

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A 46-kg woman eats a 522 Calorie (522 kcal) jelly doughnut for breakfast. (a) How many joules of energy are the equivalent of one jelly doughnut? 2192.4 X Your response is off by a multiple of ten. J (b) How many steps must the woman climb on a very tall stairway to change the gravitational potential energy of the woman-Earth system by a value equivalent to the food energy in one jelly doughnut? Assume the height of a single stair is 15 cm. 8.67 X Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. stairs (c) If the human body is only 26% efficient in converting chemical potential energy to mechanical energy, how many steps must the woman climb to work off her breakfast? 9 X Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. stairs
A 55-kg woman cheats on her diet and eats a 540-Calorie (540 kcal) jelly doughnut for breakfast. (a) How many joules of energy are the equivalent of woman climb to perform an amount of mechanical work equivalent to the food energy in one jelly doughnut? Assume the height of a single stair is 15 cm. (c) If the human body is only 25% efficient in converting chemical energy to mechanical energy, how many stairs must the woman climb to work offher breakfast?
A food calorie is a unit of energy such that 1 food calorie = 4184 J. This means that a person that burns energy with a power of 4184 W would burn one food calorie every second. A more typical human power rate is 90 W (called the basal metabolic rate). At this rate, how many calories are burned per second (or alternatively, how many seconds does it take to burn 1 calorie)?

Chapter 11 Solutions

College Physics

Ch. 11 - Prob. 6WUECh. 11 - A large room in a house holds 975 kg of dry air at...Ch. 11 - A wooden wall 4.00 cm thick made of pine with...Ch. 11 - A granite ball of radius 2.00 m and emissivity...Ch. 11 - Rub the palm of your hand on a metal surface for...Ch. 11 - In winter, why did the pioneers store an open...Ch. 11 - In warm climates that experience an occasional...Ch. 11 - Prob. 4CQCh. 11 - On a clear, cold night, why does frost tend to...Ch. 11 - The U.S. penny is now made of copper-coated zinc....Ch. 11 - Cups of water for coffee or tea can be warmed with...Ch. 11 - Prob. 8CQCh. 11 - A tile floor may feel uncomfortably cold to your...Ch. 11 - On a very hot day, its possible to cook an egg on...Ch. 11 - Concrete has a higher specific heat than does...Ch. 11 - You need to pick up a very hot cooking pot in your...Ch. 11 - A poker is a stiff, nonflammable rod used to push...Ch. 11 - Star A has twice the radius and twice the absolute...Ch. 11 - Prob. 15CQCh. 11 - The highest recorded waterfall in the world is...Ch. 11 - The temperature of a silver bar rises by 10.0C...Ch. 11 - Lake Erie contains roughly 4.00 1011 m3 of water....Ch. 11 - An aluminum rod is 20.0 cm long at 20.0C and has a...Ch. 11 - A 3.00-g copper coin at 25.0C drops 50.0 m to the...Ch. 11 - Prob. 6PCh. 11 - A 75-kg sprinter accelerates from rest to a speed...Ch. 11 - A sprinter of mass m accelerates uniformly from...Ch. 11 - Prob. 9PCh. 11 - Prob. 10PCh. 11 - Prob. 11PCh. 11 - A 1.5-kg copper block is given an initial speed of...Ch. 11 - A certain steel railroad rails 13 yd in length and...Ch. 11 - Prob. 14PCh. 11 - What mass of water at 25.0C must be allowed to...Ch. 11 - Lead pellets, each of mass 1.00 g, are heated to...Ch. 11 - Prob. 17PCh. 11 - In a showdown on the streets of Laredo, the good...Ch. 11 - Prob. 19PCh. 11 - A 1.50-kg iron horseshoe initially at 600C is...Ch. 11 - A student drops two metallic objects into a 120-g...Ch. 11 - When a driver brakes an automobile, the friction...Ch. 11 - Equal 0.400-kg masses of lead and tin at 60.0C are...Ch. 11 - Prob. 24PCh. 11 - A 75-g ice cube al 0C is placed in 825 g of water...Ch. 11 - Prob. 26PCh. 11 - Prob. 27PCh. 11 - Prob. 28PCh. 11 - Prob. 29PCh. 11 - Prob. 30PCh. 11 - Prob. 31PCh. 11 - Prob. 32PCh. 11 - A high-end gas stove usually has at least one...Ch. 11 - Prob. 34PCh. 11 - Steam at 100.C is added to ice at 0C. (a) Find the...Ch. 11 - The excess internal energy of metabolism is...Ch. 11 - A 3.00-g lead bullet at 30.0C is fired at a speed...Ch. 11 - A glass windowpane in a home is 0.62 cm thick and...Ch. 11 - A pond with a flat bottom has a surface area of...Ch. 11 - The thermal conductivities of human tissues vary...Ch. 11 - A steam pipe is covered with 1.50-cm-thick...Ch. 11 - The average thermal conductivity of the walls...Ch. 11 - Consider two cooking pots of the same dimensions,...Ch. 11 - A thermopane window consists of two glass panes,...Ch. 11 - A copper rod and an aluminum rod of equal diameter...Ch. 11 - A Styrofoam box has a surface area of 0.80 m and a...Ch. 11 - A rectangular glass window pane on a house has a...Ch. 11 - Prob. 48PCh. 11 - Measurements on two stars indicate that Star X has...Ch. 11 - The filament of a 75-W light bulb is at a...Ch. 11 - The bottom of a copper kettle has a 10.0-cm radius...Ch. 11 - A family comes home from a long vacation with...Ch. 11 - A 0.040.-kg ice cube floats in 0.200 kg of water...Ch. 11 - The surface area of an unclothed person is 1.50...Ch. 11 - A 200-g block of copper at a temperature of 90C is...Ch. 11 - Prob. 56APCh. 11 - A student measures the following data in a...Ch. 11 - Prob. 58APCh. 11 - A class of 10 students; taking an exam has a power...Ch. 11 - A class of 10 students taking an exam has a power...Ch. 11 - A bar of gold (Au) is in thermal contact with a...Ch. 11 - An iron plate is held against an iron, wheel so...Ch. 11 - Prob. 63APCh. 11 - Three liquids are at temperatures of 10C, 20C, and...Ch. 11 - Prob. 65APCh. 11 - A wood stove is used to heat a single room. The...Ch. 11 - Prob. 67APCh. 11 - Prob. 68APCh. 11 - The surface of the Sun has a temperature of about...Ch. 11 - The evaporation of perspiration is the primary...Ch. 11 - Prob. 71APCh. 11 - An ice-cube tray is filled with 75.0 g of water....Ch. 11 - An aluminum rod and an iron rod are joined end to...
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