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## Homework Statement

A child exerts a tangential 42.4 N force on the rim of a disk-shaped merry-go-round with a radius of 2.20 m. If the merry-go-round starts at rest and acquires an angular speed of 0.0870 rev/s in 4.50 s, what is its mass?

## Homework Equations

t=I[tex]\alpha[/tex]

I=.5mr

^{2}

## The Attempt at a Solution

42.4=.5*2.2

^{2}*.8087*m

m=21.665

Would the above be correct? I'm hesitant about entering it as I only have one more attempt to solve this problem. If not would converting the revolutions per second into radians per second be the right thing to do? Anyone see anything I'm missing? Any help is appreciated. Thank you.

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