JEE Main202116 Mar 2021Morning ShiftPhysicsRotational MotionActual
The maximum and minimum distances of a comet from the Sun are 1 . 6 × 10 12 m and 8 . 0 × 10 10 m respectively. If the speed of the comet at the nearest point is 6 × 10 4 m s - 1 , the speed at the farthest point is
Options
- A1 . 5 × 10 3   m   s - 1
- B6 . 6 × 10 3   m   s - 1
- C3 . 0 × 10 3   m   s - 1
- D4 . 5 × 10 3   m   s - 1
Correct answer
C. 3 . 0 × 10 3   m   s - 1
Step-by-step solution
By angular momentum conservation : m v 1 r 1 = m v 2 r 2 v 1 = 48 × 10 14 1 . 6 × 10 12 = 3000   m   s - 1 = 3 × 10 3   m   s - 1 .