NEET 2022 Phase 2 | Work, Energy and Power Question 3 | Physics

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)

23000

20000

34500

23500

NEET 2021

MCQ (Single Correct Answer)

-1

A particle is released from height S from the surface of the Earth. At a certain height its kinetic energy is three times its potential energy. The height from the surface of earth and the speed of the particle at that instant are respectively -

$${S \over 4},\sqrt {{{3gS} \over 2}} $$

$${S \over 4},{{3gS} \over 2}$$

$${S \over 4},{{\sqrt {3gS} } \over 2}$$

$${S \over 2},{{\sqrt {3gS} } \over 2}$$

NEET 2021

MCQ (Single Correct Answer)

-1

Water falls from a height of 60m 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/s²)

7.0 kW

10.2 kW

8.1 kW

12.3 kW

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