Gravitation-Energy (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 5 - 8 of 10

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Question number: 5

» Gravitation » Energy

MCQ▾

Question

A body of mass 250 kg falls on the earth from infinity. What will be its energy on reaching the earth? Radius of the earth is 6400 km and g = 9.8 m/s 2. Air friction is negligible.

Choices

Choice (4) Response

a.

1.56 ⨯ 10 10 J

b.

2.27 ⨯ 10 10 J

c.

2.54 ⨯ 10 9 J

d.

1.27 ⨯ 10 9 J

Question number: 6

» Gravitation » Energy

MCQ▾

Question

If g is the acceleration due to gravity on the earth’s surface the gain in P. E. of an object of mass m raised from the surface of the earth to a height of the radius R of the earth is -

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 7

» Gravitation » Energy

MCQ▾

Question

With what velocity must a body be thrown upward form the surface of the earth so that it reaches a height of 10 R e? Mass of earth M = 6 ⨯ 10 24 kg, radius R e = 6.4 ⨯ 10 6 m and G = 6.67 ⨯ 10 -11 N-m 2 /kg 2.

Choices

Choice (4) Response

a.

10.7 ⨯ 10 3 m/s

b.

10.7 ⨯ 10 5 m/s

c.

10.7 ⨯ 10 4 m/s

d.

1.07 ⨯ 10 4 m/s

Question number: 8

» Gravitation » Energy

MCQ▾

Question

The masses and the radius of the earth and the moon are M 1, M 2 and R 1, R 2 respectively their centers are at distance d apart. The minimum speed with which a particle of mass m should be projected form a point midway between the two centers so as to escape to infinity will be

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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