Centripetal acceleration

Physics
Tutor: None Selected Time limit: 1 Day

john whirls a ball on the end of a string in a horizontal circle a radius R at constant speed v. If he wants to increase the centripetal acceleration of the ball by a factor of 4 what must he do?

a. keep the speed fixed and increase the radius by 4

b. keep the radius fixed and increase the speed by 4

c. keep the radius fixed and increase the speed by 2

d. keep the speed fixed and decrease the radius by 2

May 2nd, 2015

c is correct, becasue 

ac = w^2/r = v^2/r  keep r fixed double V will increase ac by a factor of 4.  

May 2nd, 2015

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May 2nd, 2015
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May 2nd, 2015
Dec 9th, 2016
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