Homework Help: physics

Posted by Sejul on Sunday, February 12, 2012 at 3:04pm.

a .20 kg ball on a string is whirled on vertical circle at constant speed. When the ball is at 3:00 position, tension is 16 N.
a) is centripetal force acting on ball the same at each point on the circle?
b) when the ball is at 3:00, what is proving the centripetal force: gravity, tension in string, or combinaiton of both?
c) Is the tension in the string greater when the ball is at 12:00 or 6:00 position?

physics - ryan, Sunday, February 12, 2012 at 3:16pm
A) yes.
B)gravity acts straight down at w=mg. centripetal force is acting towards the center of where it rotates. It would be from the tension.
C)It is equal the whole way through. Since it is moving in a uniform circle, the force is equal at any point throughout the rotation.

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