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Question (11)

QN0035089

Two bodies of mass and are tied to the ends of a massless string. The string passes over a pulley which is frictionless (see figure). The acceleration of the system in terms of acceleration due to gravity is:

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

Correct Answer: B

Explanation:

Impulse, change in linear momentum

or,

Velocity of ball at ground

(v)

.

Impulse change in momentum is called impulse momentum theorem. Impulse of a force is a measure of total effect of force.

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Question (12)

QN0035090

A ball of mass is dropped from a height , strikes the ground and rebounds to the same height. Magnitude of impulse imparted to the ball is nearly

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

Correct Answer: C

Explanation:

Change in momentum,

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Question (13)

QN0035091

A football player is moving southward and suddenly turns eastward with the same speed to avoid an opponent. The force that acts on the player while turning is

(A)
Along eastward
(B)
Along northward
(C)
Along north-east
(D)
Along south-west

Correct Answer: C

Explanation:

Direction of change of momentum and direction of force acting on the player will be same i.e., along north-east.

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Question (14)

QN0035092

Calculate the maximum acceleration of a moving car so that a body lying on the floor of the car remains stationary. The coefficient of static friction between the body and the floor is .

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

Correct Answer: C

Explanation:

As the body remains stationary,

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Question (11)

Two bodies of mass and are tied to the ends of a massless string. The string passes over a pulley which is frictionless (see figure). The acceleration of the system in terms of acceleration due to gravity is:

Explanation:

Link:

Question (12)

A ball of mass is dropped from a height , strikes the ground and rebounds to the same height. Magnitude of impulse imparted to the ball is nearly

Explanation:

Link:

Question (13)

A football player is moving southward and suddenly turns eastward with the same speed to avoid an opponent. The force that acts on the player while turning is

Explanation:

Link:

Question (14)

Calculate the maximum acceleration of a moving car so that a body lying on the floor of the car remains stationary. The coefficient of static friction between the body and the floor is .

Explanation:

Link:

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