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Power

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2022 2 questions

An electric lift with a maximum load of 2000 kg (lift + passengers) is moving up with a constant speed of $1.5\ ms^{-1}$. The frictional force opposing the motion is 3000 N. The minimum power delivered by the motor to the lift in watts is : ($g=10\ ms^{-2}$)
The energy that will be ideally radiated by a 100 kW transmitter in 1 hour is :

2021 1 question

Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10% of the input energy. How much power is generated by the turbine? ($g=10\ m/s^2$)