1
NEET 2023
MCQ (Single Correct Answer)
+4
-1

The potential energy of a long spring when stretched by $$2 \mathrm{~cm}$$ is U. If the spring is stretched by $$8 \mathrm{~cm}$$, potential energy stored in it will be :

A
4U
B
8U
C
16U
D
2U
2
NEET 2022 Phase 2
MCQ (Single Correct Answer)
+4
-1

The restoring force of a spring with a block attached to the free end of the spring is represented by

A
NEET 2022 Phase 2 Physics - Work, Energy and Power Question 3 English Option 1
B
NEET 2022 Phase 2 Physics - Work, Energy and Power Question 3 English Option 2
C
NEET 2022 Phase 2 Physics - Work, Energy and Power Question 3 English Option 3
D
NEET 2022 Phase 2 Physics - Work, Energy and Power Question 3 English Option 4
3
NEET 2022 Phase 1
MCQ (Single Correct Answer)
+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
4
NEET 2021
MCQ (Single Correct Answer)
+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
$${S \over 2},{{\sqrt {3gS} } \over 2}$$
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