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Things may have become confused because at one point I deduced from your equations that theta was the angle to the vertical, and I didn't go back and check the OP. When you introduced θ' you didn't define it, and I guessed wrongly.Panphobia said:Wait look, the angle between m1gcosθ' and L/2 is 90, so that means that sinθ = 1, and then θ' = the original thing given in c) (the angle θ with respect to the horizontal). So I do not know what you are talking about.
I think you are now using θ' for what was given in the OP as θ (the angle to the horizontal) and fixing θ at 90 degrees. (Not sure why you introduce it in that case.)
If so, your equation T1 = (L/2)*m1gcosθ'*sinθ reduces to T1 = (L/2)*m1gcosθ', and in terms of the original θ that's T1 = (L/2)*m1gcosθ. With which I agree!
The next step is to get the net torque. Watch the signs.