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Lecture04

# Lecture04 - An elevator is being lifted at a constant speed...

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v Motor Cable Elevator An elevator is being lifted at a constant speed by a steel cable attached to an electric motor. There is no air resistance, nor is there any friction between the elevator and the walls of the elevator shaft. The upward force exerted on the elevator by the cable is A. greater than the downward force of gravity. B. equal to the force of gravity. C. less than the force of gravity. D. any of the above, depending on the speed of the elevator.
The graph to the right shows the velocity of an object as a function of time. Which of the graphs below best shows the net force versus time for this object? t v x 0 t Σ F x 0 A. t Σ F x 0 B. t Σ F x 0 C. t Σ F x 0 D. t Σ F x 0 E.

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A B F A. the acceleration is greater than if B were on the left and A were on the right. B. the acceleration is less than if B were on the left and A were on the right. C. the crates will not move if F is less than the combined weight of A and B. D. two of the above are correct E. none of the above is correct A lightweight crate ( A ) and a heavy crate ( B ) are side-by-side on a frictionless horizontal surface. If you apply a horizontal force F to crate A ,
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