Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 271

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Dimensional formula for coefficient of restitution

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Important Questions on Laws of Motion

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 272

A body having mass

m

and moving with velocity

3 km h^{- 1}

collides with a body at rest having mass

2 m

and sticks to it. The combined mass will begin to move with a velocity,

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 273

A particle falls from a height

h

on a fixed horizontal surface and rebounds. If

e

is the coefficient of restitution, then the total distance travelled by the particle before it stops rebounding is,

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 274

A ball moving with a momentum

5 kg m s^{- 1}

strikes a wall. If the initial and final momenta make equal angles of

45 °,

then magnitude in change in momentum is,

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 275

A bullet of mass

4.2 \times 10^{- 2} kg

moving at speed of

300 m s^{- 1}

gets stuck into a block with a mass

9

times that of the bullet. If the block is free to move without any kind of friction, the heat generated in the process will be,

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 276

A particle of mass

m

moving in the

x

-direction with speed

2 v

is hit by another particle of mass

2 m

moving in the

y

-direction with speed

v

. If the collision is perfectly inelastic, the percentage loss in the energy during the collision is close to,

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 277

A bag of mass

M

hangs by a long thread and a bullet (mass

m

) comes horizontally with velocity

v

and gets caught in the bag. Then for the combined (

bag + bullet

) system

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 278

A block of mass $2 kg$ collides with identical stationary block head on elastically with velocity of $20 m s^{- 1}$ . After collision second block collides with the third block of mass $2 kg$ initially at rest. If they collide head on perfectly inelastically then the velocity of their combination will be