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Newton22
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Homework Statement
The mass of the cab is 2000kg and the mass of the counterweight in an elevator is 2600kg. Assume the mass of the cab remains constant.
The cab must descend a distance of 300m from the top floor to the bottom floor, and must do so at a constant speed of 10m/s.
A)What must the power of the motor be in order to accomplish this? Give your answer in Watts.
B) If passengers enter the cab and the mass of the cab is increased, how does this affect the power required?
Homework Equations
P = Fv
P = (10m/s)F
The Attempt at a Solution
The pully is assumed to have no friction and no mass.
The total force that is opposing the downward motion is :
F(counterweight) - F(cab)
25500N - 19600N = - 5900N
Don't know what to next. I think all we need to know is the force but what does the height have anything to do with it?
Please help and thanks