Tied mass with angular velocity

AI Thread Summary
The discussion focuses on a physics problem involving a ball tied to a thread, moving in a circular path on a smooth horizontal plane. A force of 0.8 Newtons is applied to draw the thread, maintaining a radius of 0.4 meters, while a larger force of 4 Newtons is later applied to reduce the radius to 0.1 meters. Participants are asked to calculate the work done by Harry and the work done by the ball during this process. The calculations require understanding the relationship between force, distance, and work in a circular motion context. The thread seeks assistance in solving these physics equations.
Hafid Iqbal
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A small ball (mass = 0,1 kg) tied to a non-stretchable thread moves over a smooth horizontal plane. The other end of the thread is being drawn into a hole O with a 0,8 Newton force so that the ball moves with a constant radius 0,4 m
And then Harry pull the thread with a constant force 4 Newton so that the ball moves come near to hole O until its radius is 0,1 m

a. Work done by Harry = ... J
b. Work done by that ball = ... J

Thank you very much
 
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