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

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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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Important Questions on Work, Energy and Power

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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

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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 44

A 2 g ball of glass is released from the edge of a hemispherical cup whose radius is 20 cm. How much work is done on the ball by the gravitational force during the ball’s motion to the bottom of the cup ?
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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 45

4 J of work is required to stretch a spring through 10 cm beyond its unstretched length. The extra work required to stretch it through additional 10 cm shall be :