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The 24-cm-diameter Disk in (Figure 1) Can Rotate on an Axle Through Its Center.

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Multiple torques/forces on a disk, finding cyberspace torque

  • Thread starter aliaze1
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Homework Statement

The 20-cm-diameter disk in the figure can rotate on an beam through its center.

What is the internet torque most the beam?

image: http://session.masteringphysics.com/problemAsset/1000963/5/knight_Figure_13_14.jpg

Homework Equations

τ=Frsinφ

The Endeavor at a Solution

τnet= τ1+τ2+τ3+τ4

τ1 = 30N * 0.1 * sin(90)
τ2 = 30N * 0.05 * sin(-45)
τ3 = 20N * 0.05 * sin(-90)
τ4 = 20N * 0.1 * sin(45)
_____________________
τnet =~ii.35355 Nm

this was my original solution, which came out incorrect, a friend then told me that τ4 is aught because the force of 20N is not beingness applied to a bespeak on the disk itself, so then:

τ1 = 30N * 0.one * sin(90)
τ2 = 30N * 0.05 * sin(-45)
τ3 = 20N * 0.05 * sin(-90)
_____________________
τnet =~0.94 Nm

the outcome is that I take only one attempt left at this trouble and I want to confirm this before I submit the problem

Homework Statement

Homework Equations

The Endeavor at a Solution

Answers and Replies

That looks kike information technology should be the right answer, but I think it is less confusing and error prone if you proceed the signs out of the sin arguments, in other words if a force is tending to cause conterclockwise rotation, make the unabridged torgue negative,

eg, T2=-30N*.05m*sin(45)
T3=-20N*0.05*sin(ninety)

Else information technology looks fine.

got it, yea the signs were messing me up, i got 0.94 when its actually -0.94,

thanks

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Source: https://www.physicsforums.com/threads/multiple-torques-forces-on-a-disk-finding-net-torque.168134/

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