Laws of Motion (NEET Physics): Questions 39 - 42 of 114

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Question number: 39

» Laws of Motion » Momentum

MCQ▾

Question

A particle of mass 3 kg is moving under the action of a central force whose potential energy is given by U (r) = 10r 3 joule. For what energy and angular momentum will the orbit be a circle of radius 10 m?

Choices

Choice (4) Response

a.

3.5 x 104 I, 2000 kgm 2 /sec

b.

2.5 x 103 I, 300 kgm 2 /sec

c.

2.5 x 104 J, 3000 kgm 2 /sec

d.

3.5 x 103 J, 300 kgm 2 /sec

Question number: 40

» Laws of Motion » Force and Inertia

MCQ▾

Question

In figure ABCDE is a channel in the vertical plane, part BCDE being circular with radius r. A ball is released from A and slides without friction and without rolling. It vr”- complete the loop path when

Motion graph explained by ABCDE

Motion Graph Explained by ABCDE

In this fig we show the motion of ball as ABCDE is a vertical plane and BCDE with circular path with radius r

Choices

Choice (4) Response

a.

h > 5r/2

b.

h > 2r/5

c.

h < 5 r/2

d.

h < 2r/5

Question number: 41

» Laws of Motion » Momentum

MCQ▾

Question

A boat of mass 1000 kg is moving with a velocity of 8 m/s. A person of mass 70 kg jumps into the boat. The velocity of the boat with the person will be –

Choices

Choice (4) Response

a.

74.8 m/s

b.

7.48 m/s

c.

77.1 cm/s

d.

7.71 cm/s

Question number: 42

» Laws of Motion » Force and Inertia

MCQ▾

Question

A string of length L is fixed at one end and carries a mass M at the other end. The string makes 2/tc revolutions per second around the vertical axis through the fixed end as Shown in the figure, then tension in the string is

String motion of length L carrying mass M

String Motion of Length L Carrying Mass M

A string of length L is fixed at one end and carries a mass M at the other end

Choices

Choice (4) Response

a.

4 ML

b.

5ML

c.

2 ML

d.

16 ML

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