Laws of Motion (NEET Physics): Questions 28 - 31 of 116

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Question number: 28

» Laws of Motion » Force and Inertia

MCQ▾

Question

A particle of mass m slides down from the vertex of semi-hemisphere, without any initial velocity. At what height from horizontal will the particle leave the sphere-

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 29

» Laws of Motion » Force and Inertia

MCQ▾

Question

A cricket ball of mass 250 gm moving with a velocity of 24 m/s is hit by a bat so that it acquires a velocity of 28 m/s in the opposite direction. The force acting on the ball, if the contact time is 1/100 of a second, will be -

Choices

Choice (4) Response

a.

1300 N in the final direction of ball

b.

13 N in the initial direction of ball

c.

1.3 N in the initial direction of ball

d.

130 N in the final direction of ball

Question number: 30

» Laws of Motion » Force and Inertia

MCQ▾

Question

A string of length 1 m is fixed at one end and carries a mass of 100 gm at the other end. The string makes 2/jt revolutions per second about a vertical axis through the fixed end. The angle of inclination of the string with the vertical, and the linear velocity of the mass will respectively be - (in M. K. S. system)

Choices

Choice (4) Response

a.

50°14′, 3.16

b.

52°14′, 1.6

c.

52°14′, 3.16

d.

50°14′, 1.6

Question number: 31

» Laws of Motion » Force and Inertia

MCQ▾

Question

The roadway bridge over a canal is the form of an arc of a circle of radius 10 m. What is the minimum speed with which a car can cross the bridge without leaving contact with the ground at the highest point (g = 9.8 m/s 2)

Choices

Choice (4) Response

a.

7.556 m/s

b.

5.76 m/s

c.

14.654 m/s

d.

9.899 m/s

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