Question

1. A 500-kg elevator is pulled upward with a constant force of 4900 N for a...

1. A 500-kg elevator is pulled upward with a constant force of 4900 N for a distance of 50.0 m at constant speed.

(a) What is the work done by the 4900-N force?

(b) What is the work done by gravity?

(c) Explain the energy transformations taking place as the elevator is pulled upward.

Please explin so that i can understand each step.....Thank you!!!

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Homework Answers

Answer #1

a) Work done by the force

Here is the work done is positive as the force and displacement are in the same direction.

b)Work done by gravity is

Here work done is negative as the force and displacement are in opposite directions.

c) Since the elevator is moving with constant speed, kinetic energy of elevator is not increasing. That is net workdone by all forces on the elevator are zero.

The energy delivered to the elevator by the motor of the elevator is being used to do work against gravitation at the same rate. Hence no change in kinetic energy of the elevator.

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