- #1
zoner7
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Homework Statement
A solid ball, with radius r = 6.00 centimeters and mass m = 0.400 kg, rolls without slipping on the inside of a fixed horizontal circular pipe with radius R = 0.300 meters. The ball is held at rest with its center lying on the horizontal diameter of the pipe. It is then released and rolls down the side of the pipe, in a plane perpendicular to the length of the pipe. (a) What is the total kinetic energy of the ball when it reaches the bottom of the pipe? Hint: You must take into account the distance between the ball's center of mass and the inner surface of the pipe. (b) What is the speed of the ball's center of mass when it reaches the bottom? (c) What normal force does the pipe exert on the ball when the ball reaches the bottom?
Homework Equations
The Attempt at a Solution
Well... I've got ideas, but I really don't have any confidence in anyone of them in particular.
I considered finding the arclength of the tube so that we know how the distance that the ball travels. This would enable us to find other values using rotational motion equations.
I also was looking at the kinetic energy and potential energy formulas. Clearly these are necessities.
The hint " Hint: You must take into account the distance between the ball's center of mass and the inner surface of the pipe" frankly confuses me more than anything. I'm not even sure what this means nor do I understand how it is even relevant to the solution.
I think I'm going to go back and reread the chapter. if anyone could offer a little insight while I do this, I would be very appreciative. I just need a starting point.
Thank you :)