Kinematics-Average Speed and Instantaneous Velocity (NEET Physics): Questions 88 - 92 of 108

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Question number: 88

» 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 800 m/s. What velocity does rifle man acquire at the end of 10 shots?

Choices

Choice (4) Response

a.

0.3 m/s

b.

1.2 m/s

c.

0.5 m/s

d.

0.8 m/s

Question number: 89

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

In the figure shown, the velocity of each particle at the end of 4 sec will be -

 Finding the velocity of the particle at the end of string

Finding the Velocity of the Particle at the End of String

Calculating the velocity of the particle

Choices

Choice (4) Response

a.

2.18 m/s

b.

0.872 m/s

c.

0.218 m/s

d.

8.72 m/s

Question number: 90

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

The mass of a rocket is 500 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 20 m/s 2 in the vertically upward direction (g = 10 m/s 2), will be –

Choices

Choice (4) Response

a.

45 kg/s

b.

10 kg/s

c.

60 kg/s

d.

30 kg/s

Question number: 91

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

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 900 m/s. What velocity does rifle man acquire at the end of 10 shots.

Choices

Choice (4) Response

a.

0.3 m/s

b.

0.6 m/s

c.

0.9 m/s

d.

0.5 m/s

Passage

Read the passage given below and answer the questions that follow:

A small particle of mass m/10 is moving horizontally at a height of 3R/2 from ground with velocity 10 m/s. A perfectly inelastic collision occurs at point P of sphere of mass m placed on smooth horizontal surface. The radius of sphere is R, (m = 10 kg and R = 0.1 m) (Assume all surfaces to be smooth).

Sphere of radius R – In perfect inelastic collision

Sphere of Radius R – in Perfect Inelastic Collision

In above figure we show that sphere of radius R and collision of the particle at point p of sphere of mass m placed on smooth horizontal surface.

Question number: 92 (1 of 3 Based on Passage) Show Passage

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A small particle of mass m/10 is moving horizontally at a height of 3R/2 from ground with velocity 10 m/s. A perfectly inelastic collision occurs at point P of sphere of mass m placed on smooth horizontal surface. The radius of sphere is R, (m = 10 kg and R = 0.1 m) (Assume all surfaces to be smooth).

Sphere of radius R – Having inelastic collision

Sphere of Radius R – Having Inelastic Collision

In above figure we show that sphere of radius R and collision of the particle at point p of sphere of mass m placed on smooth horizontal surface.

Angular speed of sphere just after collision is

Choices

Choice (4) Response

a.

2.5 rad/sec

b.

3 rad/sec

c.

Zero

d.

2 rad/sec

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