Kinematics-Average Speed and Instantaneous Velocity (NEET Physics): Questions 100 - 103 of 108

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Question number: 100

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A bullet of mass 0.01 kg travelling at a speed of 500 m/s strikes a block of mass 2 kg, which is suspended by a string of length 5 m. The center of gravity of the block is found to rise a vertical distance of 0.1 m. The speed of the bullet after it emerges from the block will be -

Choices

Choice (4) Response
a.

14 m/s

b.

1.4 m/s

c.

220 m/s

d.

110 m/s

Question number: 101

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A ball of mass m hits a wall with a speed v making an angle 6 with the normal. If the coefficient of restitution is e, the direction and magnitude of the velocity of ball after reflection from the wall will respectively be –

Choices

Choice (4) Response
a.

tan1(e(tanθ)) , 1ve2sin2θ+cos2θ

b.

tan1(etanθ) , vsin2θ+e2

c.

tan1(etanθ) , vetanθ

d.

tan1(tanθe) , vsin2θ+e2cos2θ

Question number: 102

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

The mass of a rocket is 600 kg and the relative velocity of the gases ejecting from it is 250 m/s with respect to the rocket. The rate of burning of the fuel in order to give the rocket an initial acceleration 40 m/s 2 in the vertically upward direction (g = 10 m/s 2), will be –

Choices

Choice (4) Response
a.

120 kg/s

b.

10 kg/s

c.

60 kg/s

d.

72 kg/s

Question number: 103

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A rifle man, who together with his rifle has a mass of 100 kg, stands on a smooth surface fires 10 shots horizontally. Each bullet has a mass 10 gm and a muzzle velocity of 600 m/s. What velocity does rifle man acquire at the end of 10 shots.

Choices

Choice (4) Response
a.

0.6 m/s

b.

0.3 m/s

c.

0.5 m/s

d.

1.2 m/s

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