# Torque of a pin.

## Homework Statement

How much torque must the pin exert to keep the rod from rotating? (L=100.9 cm, M=3.98 kg, m=537 g.)
I attached the picture of the problem. I am unsure how to approach the problem. I am looking through my College Physics and cannot find an equation to solve this problem. Help please!

## Homework Equations

Torque=distance from the pivot*the force

## The Attempt at a Solution

#### Attachments

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Redbelly98
Staff Emeritus
Homework Helper

Welcome to Physics Forums.

## Homework Statement

How much torque must the pin exert to keep the rod from rotating? (L=100.9 cm, M=3.98 kg, m=537 g.)
I attached the picture of the problem. I am unsure how to approach the problem. I am looking through my College Physics and cannot find an equation to solve this problem. Help please!

## Homework Equations

Torque=distance from the pivot*the force
Okay, so based on that equation how much torque do the bar and hanging mass each exert on the pivot point (pin location)?

You may treat the bar's mass as being located at the bar's center.

I got it.

I used the equation T=Fr for the Torque of rod M and the Torque of the weight of m then added both torques.

Thank you.