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Kepler’s second law states that the straight line joining the planet to the sun sweeps out equal times. This statement is equivalent to saying that

a)

Total acceleration is zero

b)

Tangential acceleration is zero

c)

Longitudinal acceleration is zero

d)

Radial acceleration is zero



Question ID - 55367 | SaraNextGen Top Answer

Kepler’s second law states that the straight line joining the planet to the sun sweeps out equal times. This statement is equivalent to saying that

a)

Total acceleration is zero

b)

Tangential acceleration is zero

c)

Longitudinal acceleration is zero

d)

Radial acceleration is zero

1 Answer
127 votes
Answer Key / Explanation : (b) -

(b)

Earth and all other planets move around the sun under the effect of gravitational force. This force always acts along the line joining the centre of the planet and the sun and is directed towards the sun. In other words, a planet moves around the sun under the effect of a purely radial force. Therefore, areal velocity of the planet must always remain constant.

Therefore, Kepler’s 2nd law is the consequence of the principle of conservation of angular momentum

 tangential acceleration is zero.

127 votes


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