A simple mechanics problem, please help

[stephen]

Please refer to the diagram (http://hk.pg.photos.yahoo.com/ph/good_students/detail?.dir=7712&.dnm=7c7f.jpg)

What should be the value of P to maintain the system in equilibrium?
If we just consider the free body diagram of the 160kg box, should the tension be 1600N?(Because there are only 2 forces acting on the box only)
Could any people please help?

[maverick280857]

Sorry mate...couldn't see your diagram (it doesn't show up).

[Chi Meson]

I could not see it either, but according to what you said, you are correct:

IF there are only two forces on an object, and one of them is weight, then the other must be equal to the weight if the object is in equilibrium.