Question

A certain elevator car has mass 2200 kg and is lifted by cables driven by an electric motor. The efficiency of the lift system (motor, pulleys, cable, etc.) is 67.0%. As the elevator car moves at constant speed of 3.0 m/s it encounters 220N of friction coming from its tracks. Determine the electrical power requirement for this system as it lifts the car.
what is 1/.67 *( 2200*g+220)3 watts
Calculate the number of joules of kinetic energy a 1kg parrot has when it flies at 6 m/s

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