Calculate Tension in Rope: Principle of Moments Homework

[Marcus27]

Homework Statement

Calculate the tension in the rope, T, in the diagram below: http://imageshack.com/a/img905/2848/yMC01l.png

Homework Equations

The Attempt at a Solution

The 'beam' is a stable structure, thus the resultant forces be equal that are acting upon the beam. So,
I calculated the the Torque from the mass as being 150N * 0.6m + 100N * 0.3m = 110 Nm, setting this equal to the Torque generated by the 'force line' from the rope, T*1.2m = 110Nm, thus T rounded to the nearest Newton is = 92N. I Felt fairly confident with this until my textbook said the tension in the rope is = to 100N. Can anybody clear this up for me and explain where I went wrong, Thanks!.

 

[Bystander]

150N * 0.6m + 100N * 0.3m = 110 Nm

Check your arithmetic, that's "the usual suspect."

 

[Marcus27]

Ah, thank you. I did not spot that mistake, sorry for wasting your time. Not a great first post on my part

 

[Bystander]

Do not let it ruin your day --- we've all been there.