Gravitation (NEET Physics): Questions 27 - 30 of 82

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Question number: 27

» Gravitation » Gravitational Potential

MCQ▾

Question

Two satellites S 1 and S 2 revolve round a planet in the same direction in circular orbits. Their periods of revolutions are 1 hour and 6 hour respectively. The radius of S 1 is 1.5 ⨯ 10 5 km. The velocity of S 2 with respect to S 1 will be

Choices

Choice (4) Response

a.

1.35π×105km/hr

b.

π3×104km/hr

c.

π×104km/hr

d.

2π×104km/hr

Question number: 28

» Gravitation » Kepler's Laws of Planetary Motion

MCQ▾

Question

The semi-major axes of the orbits of mercury and mars are respectively 0.387 and 1.524 in astronomical unit. If the period of Mercury is 0.222 year, what is the period of Mars?

Choices

Choice (4) Response

a.

1.73 years

b.

1.23 years

c.

3.24 years

d.

1.95 years

Question number: 29

» Gravitation » Orbital Velocity of a Satellite

MCQ▾

Question

A satellite is revolving in an orbit close to the earth’s surface. Taking the radius of the earth as 5.8 ⨯ 10 6 meter, the value of the orbital speed and the period of revolution of the satellite will respectively be (g = 9.8 meter/sec 2)

Choices

Choice (4) Response

a.

7.5 km/sec, 8.0 minutes

b.

2.7 km/sec, 8.51 minutes

c.

7.75 km/sec, 80.51 minutes

d.

7.5 km/sec, 80.51 minutes

Question number: 30

» Gravitation » Orbital Velocity of a Satellite

MCQ▾

Question

A satellite has to revolve round the earth in a circular orbit of radius 6 ⨯ 10 3 km. The velocity of projection of the satellite in this orbit will be -

Choices

Choice (4) Response

a.

16kmsec

b.

8.18kmsec

c.

3kmsec

d.

7.08kmsec

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