Posted by **AP Physics** on Tuesday, October 26, 2010 at 12:22pm.

A stone is tied to a string (length = 0.450 m) and whirled in a circle at the same constant speed in two different ways. First, the circle is horizontal and the string is nearly parallel to the ground. Next, the circle is vertical. In the vertical case the maximum tension in the string is 18.0% larger than the tension that exists when the circle is horizontal. Determine the speed of the stone.

- AP Physics -
**bobpursley**, Tuesday, October 26, 2010 at 12:39pm
mg+mv^2/r = 1.18(mv^2/r)

this should solve it, solve for v.

mg=.18mv^2/r

v= sqrt(r*g*.18)

- AP Physics -
**bobpursley**, Tuesday, October 26, 2010 at 12:40pm
oops,

v= sqrt rg/.18

check that.

- AP Physics -
**PLEASE HELP **, Tuesday, October 26, 2010 at 4:35pm
what is the radius? how do we find that out

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