Consider a string with several rocks tied along its length at equally spaced intervals.You whirl the string overhead so that the rocks follow circular paths.Compared to a rock in the middle of the string,a rock at the outer end moves
A)half as fast.
B)twice as fast.
C)at the same linear speed.

Question

Quizplus · Accepted Answer

A rock at the outer end of the string has farther distance to cover in one complete revolution than a rock in the middle. Therefore, it must move faster to cover that distance at the same rate a rock in the middle is moving. The linear speed is directly proportional to the radius of the circle, so the rock at the outer end moves twice as fast as a rock in the middle.

Consider a String with Several Rocks Tied Along Its Length