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Question (1)

QN0034989

Law of conservation of momentum follows from

(A)
Newton's first law of motion
(B)
Newton's second law of motion
(C)
Newton's third law of motion
(D)
Both (b) & (c)

Correct Answer: D

Explanation:

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Question (2)

QN0034990

A body whose momentum is constant must have constant

(A)
velocity
(B)
acceleration
(C)
force
(D)
All of these

Correct Answer: A

Explanation:

It works on the principle of conservation of linear momentum.

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Question (3)

QN0034991

In an explosion, a body breaks up into two pieces of unequal masses. In this

(A)
both parts will have numerically equal momentum
(B)
lighter part will have more momentum
(C)
heavier part will have more momentum
(D)
both parts will have equal velocity

Correct Answer: A

Explanation:

If are masses and are velocity then by conservation of momentum

or

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Question (4)

QN0034992

An explosion breaks a rock into three parts in a horizontal plane. Two of them go off at right angles to each other. The first part of mass moves with a speed of and the second part of mass moves with speed . If the third part flies off with speed then its mass is

(A)
(B)
(C)
(D)

Correct Answer: A

Explanation:

or,

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Question (5)

QN0034993

A stationary body of mass explodes into three equal pieces. Two of the pieces fly off in two mutually perpendicular directions, one with a velocity of and the other with a velocity of . If the explosion occurs in , the average force acting on the third piece in newton is

(A)
(B)
(C)
(D)

Correct Answer: D

Explanation:

According to law of conservation of momentum the third piece has momentum

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Question (6)

QN0034994

A spacecraft of mass breaks into two when its velocity is . After the break, a mass of of the space craft is left stationary. The velocity of the remaining part is

(A)
(B)
(C)
(D)

Correct Answer: B

Explanation:

From law of conservation of momentum .

Here,

.

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Question (1)

Law of conservation of momentum follows from

Explanation:

Link:

Question (2)

A body whose momentum is constant must have constant

Explanation:

Link:

Question (3)

In an explosion, a body breaks up into two pieces of unequal masses. In this

Explanation:

Link:

Question (4)

An explosion breaks a rock into three parts in a horizontal plane. Two of them go off at right angles to each other. The first part of mass moves with a speed of and the second part of mass moves with speed . If the third part flies off with speed then its mass is

Explanation:

Link:

Question (5)

A stationary body of mass explodes into three equal pieces. Two of the pieces fly off in two mutually perpendicular directions, one with a velocity of and the other with a velocity of . If the explosion occurs in , the average force acting on the third piece in newton is

Explanation:

Link:

Question (6)

A spacecraft of mass breaks into two when its velocity is . After the break, a mass of of the space craft is left stationary. The velocity of the remaining part is

Explanation:

Link:

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