Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 40

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NEET

IMPORTANT

Earn 100

(a) Two bodies of masses $m_{1}$ and $m_{2} (m_{2} > m_{1})$ are dropped from the same height. Compare their momentum just before hitting the ground.

(b) Two bodies of masses $m_{1}$ and $m_{2} (m_{2} > m_{1})$ have same $K E$ . Compare their momentum.

Important Questions on Work, Energy and Power

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 41

A body of mass

60 kg

moving with velocity

2 m s^{- 1}

collides with a body of mass

40 kg

moving with velocity

4 m s^{- 1}

. Calculate the loss of energy assuming perfectly inelastic collision.

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 42

A meteorite burns in the atmosphere before reaching Earth's surface. What happens to its momentum? Is momentum conservation principle violated?

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 44

A body of mass

10 kg

is dropped from a height of

15 m

. Assuming that the whole of the energy is converted into heat energy, find the heat energy in calorie. Given

g = 10 m s^{- 2}

and Joule's mechanical equivalent of heat

= 4 {Jcal}^{- 1}

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 46

Explain the term 'work'. Get an expression for work done by a constant force. What are its dimensions and SI unit?

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 47

Discuss the absolute and gravitational units of work on SI and CGS systems.

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 49

What is meant by PE of a spring? Get an expression for it.

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 50

Discuss the variation of $P E$ (associated with spring) with distance $x$ . Also, discuss, variations of $K E$ And total energy graphically.
OR
A small object of weight $w$ Hangs from a string of length $l$ . A variable horizontal force, $F$ , which starts at zero value and increases gradually is used to pull the object very slowly until the string makes an angle $θ$ With the vertical. Prove that the work done by the force is $w l (1 - \cos θ)$ .