Homework Help: physics

Posted by Erin on Wednesday, February 27, 2008 at 8:13pm.

A tetherball leans against the smooth, frictionless post to which it is attached.The string is attached to the ball such that a line along the string passes through the center of the ball. The string is 1.20m long and the ball has a radius of 0.120mwith mass 0.380kg. What is the force the pole exerts on the ball?

physics - bobpursley, Wednesday, February 27, 2008 at 8:36pm
Look at the angle the string makes with the pole.

.12/1.2=sinTheta

Now draw the vector diagram at the ball: mg downard, Tension along the string, and H the horizontal force.

h/mg=TanTheta

For this angle, you can use the small angle approximation that sine and tangent are equal.

H/mg=.1
physics - Anonymous, Tuesday, February 26, 2013 at 9:41pm
.374

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