Gravitation (NEET Physics): Questions 52 - 56 of 82

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Question number: 52

» 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.

mgR

b.

mgR4

c.

mgR2

d.

2mgR

Question number: 53

» Gravitation » Universal Law of Gravitation

MCQ▾

Question

What is the mass of the planet that has a satellite whose time period is T and orbital radius is r?

Choices

Choice (4) Response

a.

4π2rGT2

b.

4π2r3GT2

c.

4π2r3GT3

d.

3π2r3GT2

Question number: 54

» Gravitation » Orbital Velocity of a Satellite

MCQ▾

Question

The speed with which the earth have to rotate on its axis so that a person on the equator would weigh (27) the as much as present will be - (Take the equatorial radius as 6400 km. )

Choices

Choice (4) Response

a.

7.28 ⨯ 10 -3 rad/sec

b.

9.35 ⨯ 10 -4 rad/sec

c.

3 28 ⨯ 10 -3 rad/sec

d.

5.53 ⨯ 10 -4 rad/sec

Question number: 55

» 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: 56

» 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.

G2d(M1+M2)

b.

2GdM1M2

c.

Gd(M1+M2)

d.

2Gd(M1+M2)

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