Home
Class 11
PHYSICS
An electric motor is used to lift an ele...

An electric motor is used to lift an elevator and its load (total mass 1500kg) to a height of 20m. The time taken for the job is 20s. What work is done ? What is the rate at which work is done. If efficiency of the motor is `75%`, at which rate is the energy supplied to the motor?

Promotional Banner

Topper's Solved these Questions

  • WORK, POWER AND ENERGY

    SL ARORA|Exercise Type E|6 Videos

  • WORK, POWER AND ENERGY

    SL ARORA|Exercise Type F|15 Videos

  • WORK, POWER AND ENERGY

    SL ARORA|Exercise Type C|5 Videos

  • Work, Energy and power

    SL ARORA|Exercise EXERCISE|415 Videos

Similar Questions

Explore conceptually related problems

A ski lift elevates a skier of total mass 70 kg a vertical displacement of 300 m.on ski slope. What work is done to elevate the skier ?

What is the work done to fits to lift a body of mass 5 kg to a height of 50 m from the ground (in J)? (g = 10 m s^(-2) )

Calculate the power of a crane in watts, which lifts a mass of 100 kg to a height of 10 m in 20 s .

A body of mass 1 kg is lifted through a height of 1m, then its work done is

A motor pump-set lifts 300kg of water per minute from a well of depth 20m and delivers to a height of 20m.Then its power is ?

An electric motor creates a tension of 4500 newton in a hoisting cable and reels it at the rate of 2 m//s . What is the power of the motor ?

When a person does work, what determines his sence of fatigue : total work done or the rate at which he works ?

Find the work done of move an object of mass 3 kg to a height of 20 m from the ground (Take g =10ms^(-2) ).

An electric motor is designed to work at 100 V and draws a current of 6 A . The output power supplied by the motor is 150 W , and the remaining of the motor and its percentage efficiency?