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Get Full Access to Physics: Principles With Applications - 6 Edition - Chapter 7 - Problem 62pe
Get Full Access to Physics: Principles With Applications - 6 Edition - Chapter 7 - Problem 62pe

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# Concepts The 70.0-kg swimmer in Figure 7.44 starts a race

ISBN: 9780130606204 3

## Solution for problem 62PE Chapter 7

Physics: Principles with Applications | 6th Edition

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Problem 62PE

Concepts The 70.0-kg swimmer in Figure 7.44 starts a race with an initial velocity of 1.25 m/s and exerts an average force of 80.0 N backward with his arms during each 1.80 m long stroke. (a) What is his initial acceleration if water resistance is 45.0 N? (b) What is the subsequent average resistance force from the water during the 5.00 s it takes him to reach his top velocity of 2.50 m/s? (c) Discuss whether water resistance seems to increase linearly with velocity.

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=v 0+at v 0=v–at a=v–v /0 t=v–v /0 Example#1:Ifat0seconds,atruckismovingat10mphandisat30mph10secondslater, whatistheaccelerationofthecar a=v 1–v /0 v 0=10mph v 1=30mph a=30mph–10mph/10s-0s t0=0s t1=10s a=20mph/10s a=2mph/s Example#2:Acarstartsat5mphandacceleratesatarateof3mph/s.Howlongdoesittake togetat30mph t=v–v 0aàt=(30mph-5mph)/(3mph/s)=25/3=8.33seconds • “Falling” o velocity

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##### ISBN: 9780130606204

This textbook survival guide was created for the textbook: Physics: Principles with Applications, edition: 6. The full step-by-step solution to problem: 62PE from chapter: 7 was answered by , our top Physics solution expert on 03/03/17, 03:53PM. The answer to “Concepts The 70.0-kg swimmer in Figure 7.44 starts a race with an initial velocity of 1.25 m/s and exerts an average force of 80.0 N backward with his arms during each 1.80 m long stroke. (a) What is his initial acceleration if water resistance is 45.0 N? (b) What is the subsequent average resistance force from the water during the 5.00 s it takes him to reach his top velocity of 2.50 m/s? (c) Discuss whether water resistance seems to increase linearly with velocity.” is broken down into a number of easy to follow steps, and 84 words. Physics: Principles with Applications was written by and is associated to the ISBN: 9780130606204. This full solution covers the following key subjects: resistance, Water, velocity, average, initial. This expansive textbook survival guide covers 35 chapters, and 3914 solutions. Since the solution to 62PE from 7 chapter was answered, more than 500 students have viewed the full step-by-step answer.

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