- #1

Erdi

- 37

- 6

- Homework Statement
- I cant figure out how to solve this task. I have got two pulleys, top pulley (A) and bottom pulley(B).

The pulley (A) is stuck to the wall and cannot move. The pulley B hangs in a thread and can

therefore moveup and down. Here m1 = 0.5 kg and m2 = 2.0 kg. Both pulleys can rotate freely. All

the pulleys can be are massless and there is no friction in the system.

How large must M be for m1 to be at rest?

Look at the figure.

Thanks for help!

- Relevant Equations
- T1 - m1g = ma, where a = 0

I know that the tension from pulley B (T1) has to be equal the m*g of m1 for m1 to have acceleration = 0. But i can't figure how this works because the m2 is already heavier. And so the block(M) has to be negative weight?