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## Homework Statement

a rock of mass 0.500 kg is tied to a string of radius 75 cm and is revolving in a vertical circle at a uniform speed. determine the minimum speed for the rock to maintain a circular trajectory without the string collapsing (not staying taut). (Hint: where would that occur in the trajectory?)

m=0.500 kg

r=.75 m

## Homework Equations

mg=(mv^2)/r

## The Attempt at a Solution

v=(gr)^(1/2) (square root of g*r)

v=2.7 m/s

i don't know where i use the mass of 0.500 kg