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sofija
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Homework Statement
A tractor named A is used to lift a bale B with a system of pulleys.
The tractor has an unknown speed called VA : find the expression of the bale's vertical speed VB in function of x (distance from the tractor to the pulley).
The diameter of both pulleys can be neglected.
Homework Equations
I call T the tension in the rope, N the reaction of the ground and W=mg the weight, mA the tractor's mass and mB the bale's mass, aA the tractor's acceleration and aB the bale's acceleration.
In A, I have : horizontally -T*(x/l) = mA * aA
vertically :N - mA*g + N*(h/l) = 0
In B : T - mB*g = mB*aB
The Attempt at a Solution
I've tried to put the problem into some equations, but I don't see how I can switch from accelerations to speed...moreover, I don't have any numeric data, so any piece of information is welcome!
Thanks in advance!