Recent content by imanator

Thanks, so are you saying the platform will move back, or the momentum is conserved in the spinning, and the platform stays where it is?

when I say does the platform move, I mean a net movement, clearly the platform will oscillate while it is spinning.

Thanks Sci Advisor. I am interested in this simplification. Suppose I had a platform in space, with this apparatus(spinning arm on a pivot and a mass on the end) bolted on to the platform, and that I put another similar apparatus above it spinning in the opposite direction so that the platform...

Hi there, I am trying to understand the physics acting on a discus thrower, namely at their feet when they throw a discuss. first the player spins to pick up momentum for the discus, he or she does this by pushing on the ground but when the actual discus leaves the hand, is there an action...

does everyone else agree with this?

thanks mfb, not sure what you mean by afterwards the changed speed leads to different radial force though. are you referring to the fact the fact that the rotating mass has slowed down will result in a lower v^2/r value?

Thanks for that, I uploaded a better one.

Hi there, I'm new to the forum, but hopefully this question has a simply answer. my question is, suppose you have a mass (a) on the end of a string or rod attached to a vertical support which is grounded. The mass is rotating about that support. Now assume you have another mass (b) traveling...