1
NEET 2022 Phase 1
+4
-1

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)

A
23000
B
20000
C
34500
D
23500
2
NEET 2022 Phase 1
+4
-1

The energy that will be ideally radiated by a 100 kW transmitter in 1 hour is

A
36 $$\times$$ 107 J
B
36 $$\times$$ 104 J
C
36 $$\times$$ 105 J
D
1 $$\times$$ 105 J
3
NEET 2021
+4
-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 -
A
$${S \over 4},\sqrt {{{3gS} \over 2}}$$
B
$${S \over 4},{{3gS} \over 2}$$
C
$${S \over 4},{{\sqrt {3gS} } \over 2}$$
D
$${S \over 2},{{\sqrt {3gS} } \over 2}$$
4
NEET 2021
+4
-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)
A
7.0 kW
B
10.2 kW
C
8.1 kW
D
12.3 kW
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