A rock is whirled on the end of a string in a horizontal circle of radius R with a constant period T. If the radius of the circle is reduced to R/3, while the period remains T, what happens to the centripetal acceleration of the rock?
A)The centripetal acceleration remains the same.
B)The centripetal acceleration increases by a factor of 3.
C)The centripetal acceleration increases by a factor of 9.
D)The centripetal acceleration decreases by a factor of 3.
E)The centripetal acceleration decreases by a factor of 9.

Question

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The Answer of A rock is whirled on the end of a string in a horizontal circle of radius R with a constant period T. If the radius of the circle is reduced to R/3, while the period remains T, what happens to the centripetal acceleration of the rock?
A)The centripetal acceleration remains the same.
B)The centripetal acceleration increases by a factor of 3.
C)The centripetal acceleration increases by a factor of 9.
D)The centripetal acceleration decreases by a factor of 3.
E)The centripetal acceleration decreases by a factor of 9.

A Rock Is Whirled on the End of a String