An electric motor rated at is used to lift a loaded lift of total mass vertically

PHYSICS · Multi-part · CBSE · Physics · Work and Energy · Work and Energy

Problem

An electric motor rated at

12\,\text{kW}

is used to lift a loaded lift of total mass

600\,\text{kg}

vertically. If

10\%

of the energy supplied by the motor is lost to friction, (i) Find the maximum height through which the lift can be raised in

30\,\text{s}

. (ii) Calculate the work done against gravity during this period (take

g = 9.8\,\text{m/s}^2