M1 Pulley QuestionWatch
I'm stuck with a pulley question... Please see attached.
My attempt is also attached. Not sure where I'm going wrong... any ideas?
Err, I think that value used the previous (wrong) equation.
You had about the right approach. Just recalculate T and solve for mu.
When I resolved B, the equation should have read: 2mg - T = 2 x m x 4/9 g
So: - T = 8/9 mg - 2mg
and: T = 2mg - 8/9 mg
thus: T = 10/9 mg
Then for the second part, equating would give: 10/9 mg = 4/9 mg + mew mg
minus 4/9 mg both sides: 6/9 mg = mew mg
cancelling mg: 6/9 = mew = 2/3
Again... not enough attention paid when writing the equations... I'm getting old!
For anyone interested... full solution is now attached.