Find the net torque on the pulley

  • Thread starter mybrohshi5
  • Start date
  • #1
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Homework Statement



The pulley in the figure has radius 13.0 cm and a moment of inertia 0.230 kg m^2; the pulley is constructed from a dense metal. The rope does not slip on the pulley rim. The system is released from rest.

http://session.masteringphysics.com/problemAsset/1000057320/10/YF-09-36.jpg

Find the net torque on the pulley, about its axle, due to the differing tensions in the rope on the two sides of the pulley.

Homework Equations





The Attempt at a Solution



From earlier parts of the problem i have found the acceleration of the blocks a = 1.0m/s^2 and the velocity final of the larger falling block v = 3.16 m/s. i also found the tension in both of the ropes. T in rope attached to the larger mass was 35.2 N and the T in the rope on the smaller mass was 21.6 N

Now i cannot find the net torque it is asking for

I tried doing this

t = torque

tlarger block - tsmaller block = tnet

T*d - T*d = tnet

35.2N(5m) - 21.6N(5m) = tnet

tnet = 68Nm

This is wrong? How else can i go about this problem?

thank you
 

Answers and Replies

  • #2
365
0
i was using the height instead of the radius

i got it now :)
 

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