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An elevator can carry a maximum load of ...

An elevator can carry a maximum load of `1800 kg` (elevator + passengers) is moving up with a constant speed of `2 ms^(-1)`. The friction force opposite the motion is `4000 N`.What is minimum power delivered by the motor to the elevator?

A

24kW

B

32kW

C

44kW

D

52kW

Text Solution

Verified by Experts

The correct Answer is:
C
The work done by the pump -increase in potential energy of the water , when it is lifted through a height h=high But Power `=2 KW = 2 xx 10^(3)` watt and t=60 s
` therefore P=W/t=(mgh)/(t)`
`therefore 2 xx 10^(3)=(Mxx10xx10)/(60)`
`therefore M=1200 ` kg
But one litre of water weigths 1 kg .
`therefore ` Volume of water =1200 litre =1200 L
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