AP Physics
posted by AP Physics .
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
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
oops,
v= sqrt rg/.18
check that. 
AP Physics 
PLEASE HELP
what is the radius? how do we find that out
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