Question

Statement-1: For the planets orbiting around the sun, angular speed, linear speed, `KE` changes with time,but angular momentum remains constant.
Statement-2: No torque is acting on the rotating planet, so its angular momentum is constant.
A. Statement-1 is true, statement-2 is true, Statement-2 is a correct explanation for statement-1.
B. Statement-1 is true, Statement-2 is true, statement-2 is Not a correct explanation for statement-1
C. Statement-1 is true, Statement-2 is false.
D. Statement-1 is false Statement-2 is True.

Answer 1

Correct Answer - a
The torque on a body is given by `vec(tau)=(dvec(tau))/(dt)`. In case of planet orbiting around the sun no torque is acting on it. `implies L` (angular momentum)=constant