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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 120

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A body of mass $5 m$ initially at rest explodes into $3$ fragments with mass ratio $3 : 1 : 1$ . Two of fragments each of mass $m$ are found to move with a speed of $60 m s^{- 1}$ is mutually perpendicular directions. The velocity of third fragment is

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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 121

Two particles move towards each other from rest under a mutual force of attraction. At the instant, when the speed of

A

is

v

, the speed of

B

is

\frac{v}{2}

. The speed of the centre of mass of the system is:

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 122

As an inclined plane is made slowly horizontal by reducing the value of angle

θ

with horizontal, the component of weight parallel to the plane of a block resting on the inclined plane-

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 123

A vessel containing water is given a constant acceleration $a$ towards the right, along a straight horizontal path. Which of the following diagram represents the surface of the liquid?

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 124

The motion of the centre of mass of a system of two particles is unaffected by their internal forces:

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 125

A bomb of mass

12 kg

at rest explodes into two fragments of masses in the ratio

1 : 3

. The kinetic energy of the smaller fragment is

216 J

. The momentum of the heavier fragment is (in

kg m s^{- 1}

)

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 126

A bomb of mass

30 kg

at rest explodes into two pieces of masses

18 kg

and

12 kg

. The velocity of

18 kg

mass is

6 {ms}^{- 1}

. The kinetic energy of the other mass is

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 127

Two putty balls of equal mass moving with equal velocity in mutually perpendicular directions, stick together after the collision. If the balls were initially moving with a velocity of