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putongren

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## Homework Statement

The forearm accelerates a 3.6 kg ball at 7.0 m/s

^{2}by means of the triceps muscle. The forearm is 30 cm long and is perpendicular triceps muscle. Calculate the torque and the force exerted by triceps muscles.

## Homework Equations

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

[tex]\tau[/tex] = R x F

## The Attempt at a Solution

a = 7.0 (m/s

^{2}), m = 3.6 (kg), r = .03 (m)

[tex]\tau[/tex] = I[tex]\alpha[/tex] , [tex]\alpha[/tex] = a/r, I = m*r

^{2}

= m*r

^{2}[tex]\alpha[/tex]

= m*r*a

= 3.6*.03*7

[tex]\tau[/tex] = .756

[tex]\tau[/tex] = r * F

F = [tex]\tau[/tex]/r

F = .756/.03

F = 25.2