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

Formula for centripetal acceleration = v^2 / r

C is the correct option since when the velocity will be increase by the factor of 2, it will geet squared which will give resultant factor of 4.

Answer option C.

May 2nd, 2015

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May 2nd, 2015
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May 2nd, 2015
May 26th, 2017
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