What is the net torque on the pulley about the axle

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Homework Help Overview

The problem involves calculating the net torque on a pulley about its axle, given two tensions, T1 and T2. The context is within the subject area of rotational dynamics.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the definition of torque and its calculation, with one participant expressing confusion about how to start the problem. Others suggest considering the effects of individual forces and clarify the equation for torque.

Discussion Status

The discussion includes attempts to clarify the concept of torque and its calculation. Some guidance has been offered regarding the use of the torque equation and the importance of the angle between the force and the radius. The original poster indicates they have figured out the problem before receiving further assistance.

Contextual Notes

There is an indication that the original poster may have been confused about the application of the torque equation and the role of angles in determining torque, which are points of discussion among participants.

aligass2004
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Homework Statement



What is the net torque on the pulley about the axle if T1 = 18N and T2 = 34N?
http://i241.photobucket.com/albums/ff4/alg5045/p13-11.gif

Homework Equations





The Attempt at a Solution



Torque is really confusing me. I have no ideas as to how to start this problem.
 
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You're going to have to show some work, but to "push" you along... could you get started if there were only 1 force?
 
I know that torque = r(Ft), but I don't know if that's the right equation to use.
 
I'm guessing that Ft is the force that is perpendicular to the radius. Is that what you mean? If so, that is the right equation.

To give a longer answer than you might want,
Torque = force x radius x sine of the angle between the force and the radius.
In many cases, the angle is 90 degrees (it certainly is in your picture) and sin(90) = 1, so torque = force x radius in those cases.

So, now can you calculate the two torques, ONE AT A TIME, including whether it goes clockwise (CW) or counterclockwise (CCW)?
 
I figured it out before looking at your last post. Thanks though!
 

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