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Introductory Physics Homework Help
Find the power needed to accelerate this elevator downward
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[QUOTE="haruspex, post: 6435001, member: 334404"] "Fnet"? You are trying to find the power generated by the engine. The equations only makes sense if 'Fnet' is the force exerted by the engine, upwards positive. All you need to add is the relationship between v and a and you have yourself a differential equation. The benefit of working in terms of energy is usually that it avoids involving time in the first integration step, giving the relationship between velocity and displacement. But of course velocity is dx/dt, so you still get a differential equation in x and t. Having solved that you can find v(t) and hence P(t). So you can solve it either way, in terms of energy or forces. [/QUOTE]
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Introductory Physics Homework Help
Find the power needed to accelerate this elevator downward
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