Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 35

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The mass of a bucket full of water is 15 kg. It is being pulled up from a 15m deep well. Due to a hole in the bucket 6 kg water flows out of the bucket. The work done in drawing the bucket out of the well will be (g = 10m/s²) :

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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 36

A uniform chain of length L and mass M is lying on a smooth table and

\frac{2}{3}

of its length is hanging down over the edge of the table. If g is the acceleration due to gravity, the work done to pull the hanging part on the table is :-

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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 37

A

10 kg

satellite completes one revolution around the earth at a height of

100 km

in

108 minutes

. The work done by the gravitational force of earth will be -

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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 38

A particle is moved from (0, 0) t o (a, a) under a force $\vec{F} = (3 \hat{i} + 4 \hat{j})$ from two paths. Path 1 is OP and path 2 is OQP. Let W₁ and W₂ be the work done by this force in these two paths. Then :

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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 39

A spring of force constant

800 N m^{- 1}

has an extension of

5 cm

. The work done in extending it from

5 cm

to

15 cm

is,

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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 40

If a spring extends by x on loading then energy stored by the spring is :- (T is tension in the spring, K = spring const.)

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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 41

A body of mass

2 kg

falls from a height of

20 m

. What is the loss in potential energy?

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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 42

In stretching a spring by 2 cm energy stored is given by U, then stretching by 10 cm energy stored will be :-

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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 43

If the potential energy of two molecules is given by

U = \frac{A}{r^{12}} - \frac{B}{r^{6}}

, then at the equilibrium position, its potential energy is equal to