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Get Full Access to Physics - 4 Edition - Chapter 7 - Problem 79
Get Full Access to Physics - 4 Edition - Chapter 7 - Problem 79

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# Solved: Brain Power The human brain consumes about 22 W of

ISBN: 9780321611116 152

## Solution for problem 79 Chapter 7

Physics | 4th Edition

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Problem 79

Brain Power The human brain consumes about 22 W of power under normal conditions, though more power may be required during exams. (a) How long can one Snickers bar (see the note following 50) power the normally functioning brain? (b)At what rate must you lift a 3.6-kg container of milk (one gallon) if the power output of your arm is to be 22 W? (c) How long does it take to lift the milk container through a distance of 1.0 m at this rate?

Step-by-Step Solution:
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• SpeedingUpIndex o Somethingpersomethingelse=index o something/somethingelse=speed/time=acceleration • Tofindacceleration…(twoways) 1. DataTableWay Example: t v Δt(t 2t 1) Δv(v 2v )1 a(Δv/Δt) 0s 5mph -- -- -- 2s 25mph 2 20 10 4s 45mph 2 20 10 2. AccelerationEquation:(a)=Δv/Δt (0s,5mph) (4s,45mph) a=Δv/Δt=(45mph-5mph)/(4s-0s)=40mph/4s=10mph/s v=

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Solved: Brain Power The human brain consumes about 22 W of