A 0.25 kg steel ball is tied to the end of a string and then whirled in a vertical circle at a constant speed v. The length of the string is 0.62 m, and the tension in the string when the ball is at the top of the circle is 4.0 N. What is v

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India Lam

Physics

1 August, 14:09

A 0.25 kg steel ball is tied to the end of a string and then whirled in a vertical circle at a constant speed v. The length of the string is 0.62 m, and the tension in the string when the ball is at the top of the circle is 4.0 N. What is v

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Tristan Holder · Answer 1

Let the tension in the string be T. At the top of the circle, total force acting on them = T + mg. This will provide centripetal force

T + mg = m v² / r

4 +.25 x 9.8 =.25 x v² /.62

6.45 =.25 v² /.62

v² = 16

v = 4 m / s.