# Rock on a string

1. Mar 19, 2012

### TheronSimon

1. The problem statement, all variables and given/known data
so theres a 6 kg rock spinning in a circle with a string that can with stand a maximum tension of 75 and a radius of 1.5m
and i need to find the maximum speed before the string will break

2. Relevant equations

Fnet=ma
a=4$\pi$2R/T2

3. The attempt at a solution
so Fnet =ma and a = 4$\pi$2R/T2
so Fg = m*4$\pi$2R/T2
so 6*9.8 = 6*4$\pi$21.5/T2
so 58.8 = 284.24 / T2
so T = 2.2

no would i be able to use this formula a=4$\pi$2R/T2 to find the acceleration and then use a= v2/R to get the speed?

Last edited: Mar 19, 2012
2. Mar 19, 2012

### TheronSimon

anyone?

3. Mar 20, 2012

no nothing?