A stone is tied to a string and whirled at constant speed in a horizontal circle. The speed is then doubled without changing the length of the string. Afterward the magnitude of the acceleration of the stone is:

Afterward the magnitude of the acceleration of the stone is four times as great

Explanation:

A stone tied to a string and whirled at a constant speed in a horizontal circle will have a centripetal acceleration given by

Where is the centripetal acceleration

is the speed

and is the radius of the circle

Here, the radius of the circle is the length of the string.

Now, from the question

The speed is then doubled without changing the length of the string,

Let the new speed be , that is

and without changing the length of the string means radius is constant.

To determine the magnitude of the acceleration of the stone afterwards,

Let the new acceleration be .

Then we can write that

From

Recall that

∴

Now, we will put the value of into

Then,

The new magnitude of the acceleration of the stone is four times the initial acceleration.

Hence,

Afterward the magnitude of the acceleration of the stone is four times as great

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explanation: