Homework Help: Physics

Posted by Freud on Wednesday, October 26, 2011 at 11:53pm.

A rock of mass m = 1.8 kg is tied to a string of length L = 2.4 m and is twirled in a vertical circle as shown in the figure below. The speed v of the rock is constant; that is, it is the same at the top and the bottom of the circle. If the tension in the string is zero when the rock is at its highest point (so that the string just barely goes slack), what is the tension when the rock is at the bottom?

Physics - drwls, Wednesday, October 26, 2011 at 11:58pm
2 M g

V^2/R must equal M*g in order for string tension to go to zero at the top. At the bottom, the same centripetal force gets added to the weight (M*g) when computing string tension.

Answer this Question

Related Questions

physics - A light string has its ends tied to two walls separated by a distance ...
physics - A light string has its ends tied to two walls separated by a distance ...
PHYSICS - 8) A rock of mass 400 g is tied to one end of a string that is 2.0 m ...
physics - an air puck of mass 0.347 kg is tied to a string and allowed to ...
Physics B - An air puck of mass 0.289 kg is tied to a string and allowed to ...
AP Physics B - An air puck of mass 0.102 kg is tied to a string and allowed to ...
Physics - An air puck of mass 0.23 kg is tied to a string and allowed to revolve...
Physics - A stone of mass 3.2 kg is tied to a string of length 0.9 m, and is ...
Physics - An air puck of mass 0.289 kg is tied to a string and allowed to ...
physics - In the figure we see two blocks connected by a string and tied to a ...

For Further Reading

First Name:
School Subject:
Answer: