# Energy: Mass and Angles

Not what you're looking for?

If M=0, theta=arccos(2/3) where theta is the angle between the right, for example and the pearl at the top of the circle (or the ring).

A ring of mass M hangs from a thread, and two beads of mass m slide on it without friction.The beads are released simultaneously from the top of the ring and slide down opposite sides.

Show that the ring will start to rise if m>3M/2, and find the angle at which it occurs

##### Purchase this Solution

##### Solution Summary

This solution is provided in 367 words. It uses Newton's law to describe the circular motion of the mass and how this relates to mass. All calculations are included.

##### Solution Preview

Let the radius of the ring be R. Let "theta" be the angle mass m makes with the vertical at any time t after they are released from the top.

Since we have a frictionless movement, the force acting on the beads are always pointing along N, the Normal Force acting along the radius, but away from it.

Apply Newton's law for the circular motion of the bead of mass m.

m*g*Cos(theta) - N = m*v^2/R (Resultant Centripetal force) ...

##### Purchase this Solution

##### Free BrainMass Quizzes

##### Classical Mechanics

This quiz is designed to test and improve your knowledge on Classical Mechanics.

##### Variables in Science Experiments

How well do you understand variables? Test your knowledge of independent (manipulated), dependent (responding), and controlled variables with this 10 question quiz.

##### Basic Physics

This quiz will test your knowledge about basic Physics.

##### Introduction to Nanotechnology/Nanomaterials

This quiz is for any area of science. Test yourself to see what knowledge of nanotechnology you have. This content will also make you familiar with basic concepts of nanotechnology.

##### Intro to the Physics Waves

Some short-answer questions involving the basic vocabulary of string, sound, and water waves.