Question

An elevator car has a mass of 1500 kg carry 3 passengers with a total mass...

An elevator car has a mass of 1500 kg carry 3 passengers with a total mass of 330 kg. The lift operates with a constant frictional force of 2 700 N working against the motion of the elevator.

How much power must the motor deliver to the elevator cart to keep it moving at a constant speed of 2.4 ms-1 ?

How much power would need to be supplied by the motor if it was 70% efficient?

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Answer #1

Find the equation of motion of elevator where acceleration is zero due to constant speed and find the tension required to pull it up. Use the tension and speed to find the power as shown below

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