Question

For a planet revolving around the sun-

• A. linear speed and angular momentum are constant
• B. areal velocity and angular momentum are constant
• C. linear speed and areal speed are constant
• D. areal velocity is constant but angular momentum changes.

Answer 1

The correct option is D areal velocity is constant but angular momentum changes.

A planet moves around the sun in an elliptical orbit with the sun at one of its foci. The physical quantity associated with the motion of the planet that remains constant with time is: velocity. Centripetal force.

The line joining a planet to the Sun sweeps out equal areas in equal interval of time. The rate of change of area with time will be constant. We can see in the above figure, the Sun is located at the focus and the planets revolve around the Sun.That is the aerial velocity of the planets remains constant