Calculating Torque of a Suspended Bar with Tension | Homework Solution

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SUMMARY

The discussion focuses on calculating the torque exerted on a horizontal bar suspended by a cord with tension T. The torque formula used is torque = rF, where r is the distance D from the wall to the point of tension application. The correct expression for torque in this scenario is DTsin(theta), where theta is the angle between the cord and the horizontal. It is established that when the angle with the wall is zero or 180 degrees, the torque becomes zero.

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More torque yay!

Homework Statement



A horizontal bar with a mass m suspended from one end is held by a cord with tension T, fastened at a distance D from the end of the bar that is attached to a wall with a frictionless pin. What is the torque about the pin exerted on the bar by the cord?

Homework Equations



torque = rF

The Attempt at a Solution



My answer is DTsin(theta.

Am I right or way off?
 
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Since they only want the torque from the cord, (you can ignore the mass of the bar and the torque generated from its weight), then your answer is OK.

When the angle with the wall is zero or 180, there is no torque.
 

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