Question

A huge circular arc of length 4.4 ly subtends an angle '4s' at the centre of the circle. How long it would take for a body to complete 4 revolution if its speed is 8 AU per second ?

Given : 1 ly = 9.46 × 10¹⁵ m

1 AU = 1.5 × 10¹¹ m

(1) 4.1 × 10⁸ s

(2) 4.5 × 10¹⁰ s

(3) 3.5 × 10⁶ s

(4) 7.2 × 10⁸ s

Answer 1

Correct answer is (2).

\(R = \frac{\ell}{\theta}\)