# [physics] Help

• Sep 26th 2007, 06:08 AM
iceman1
[physics] Help
Hello
two particultes A and B, of masses my and mB respectively, are connect by an inextensible wire and of negligible mass,
the wire passes on the throat of a negligible pulley supposee of mass.
At the moment t0=0 the system S (pulley, masses, wire) east gives up without initial speed, the particle B being a distance H of the axis of the pulley.
the level of reference of the potential enegrgie of gravity is on the level of horizontal plane contenat the axis of the pulley and particle A. one neglects frictions

a>calculer has t0=0, the mechanical energy of system (S, ground) according to mB, G and H
b>calculez the mechanical energy of the system (S, terre_apres a course X of A
c>eb applying the consrvation of the mechanical enegrie, calculate the speed V of A and B according to X, my, mB and G.
deduce acceleration from the Movement
http://i23.tinypic.com/euj1wx.jpg

i tried but bad results for the first question:
i got mB.V^2.g.h
for the second V^2.h

Thanks
• Sep 26th 2007, 07:14 AM
iceman1
ok ok:D i Got it now just spent 1 Hour and Fixed

Thanks:)

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