Home
Class 12
PHYSICS
Assertion: The planet move slower when t...

Assertion: The planet move slower when they are farther from the Sun than when they are nearer.
Reason : Angular velocity of a planet is a constant quantity.

A

If both the assertion and reason are true statement and reason is correct explanation of the assertion .

B

If both the assertion and reason are true statement but reason is not a correct explanation of the assertion .

C

If the assertion is true but the reason is a false statement.

D

If both assertion and reason are false statements.

Text Solution

Verified by Experts

The correct Answer is:
B
Sweeping equal areas in equal time intervals is a consequence of law of conservation of angular momentum. So long as the gravitational force is Radial, no torque acts on the planet and the angular momentum in conserved .
It is also true that a planet moves in an elliptical orbit. But this not the reason of the assertion .
Promotional Banner

Similar Questions

Explore conceptually related problems

When a planet moves around the sun

Assertion : The kinetic energy does not change when a particle moves in uniform magnetic field. Reason : The velocity of the particle is not affected by magnetic field.

Assertion : Angular speed of a planet around the sun increases, when it is closer to the sun. Reason : Total angular momentum of the system remains constant.

A planet is revolving around the Sun in an elliptical orbit. Its closest distance from the sun is r_(min) . The farthest distance from the sun is r_(max) if the orbital angular velocity of the planet when it is nearest to the Sun omega then the orbital angular velocity at the point when it is at the farthest distance from the sun is

Assertion : A central force is such that the force on the planet is along the vector joining the sun and the planet. Reason : Conservation of angular momentum is valid for any central force.

Assertion : When two masses come closer, their gravitational potential energy decreases. Reason : In moving attract each other.

When a satellite moves around the earth, the quantity which remains constant is

Assertion : If a particle moves with a constant velocity, then angular momentum of this particle about any point remains constant. Reason : Angular momentum has the units of Plank's constant.

Assertion: An object can have constant speed but variable velocity. Reason: Speed is a scalar but velocity is a vector quantity.

Assertion : In planetary motion angular momentum of planet about centre of sun remains constant. But linear momentum of system does not remain constant. Reason : Net torque on planet any point is zero.