Gravitation Test

Result

Gravitation Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

For a satellite to orbit around Earth, which of the following must be true?

A
It must be above the equator at sometime.

B
It cannot pass over the poles at any time.

C
Its height above the surface cannot exceed 36,000 km.

D
none of these

Solution

The orbit ellipse of a satellite lies in a plane known as the orbital plane. The orbital plane always goes through the centre of Earth, but may be tilted any angle relative to the equator. Hence, a satellite must be above the equator at sometime.
Question 2
1 / -0

Two planets are moving around the sun. The periodic times of the orbits are T₁, T₂and mean radii of the orbits are r₁, r₂. The ratio of T₁/T₂ is equal to

A
(r₁/r₂)

B
(r₁/r₂)^3/2

C
(2r₁/r₂)²

D
(r₁/2r₂)^3/2

Solution

T² is directly proportional to r³ (Kepler's third law)

T₁/T₂ = (r₁/r₂)^3/2
Question 3
1 / -0

Mass is converted into energy according to the relation

A
E = mgh

B
E = mc²

C
E = mg/h

D
E = (1/2) mv²

Solution

Mass is converted into energy according to the relation E = mc²