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OP has been reminded that they need to show their work when posting schoolwork questions

## Homework Statement

How much torque is needed to change the speed of spinning rate of a 3.50 kg sphere with a radius of 7.50 m from 900. rpm to 200. rpm in 3.0 s? [-1924 -1.92 x 103 Nm]

## Homework Equations

t = I * α

I = (2/5)mr^2

t = F * r

## The Attempt at a Solution

just cant get a crack at it.[/B]