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Assertion : Angular momentum of sun and ...

Assertion : Angular momentum of sun and planet system about any point remains constant
Reason : Two equal and opposite forces will acts on them. Net torque of these two set of forces about any point is zero.

A

If both Assertion and Reason are correct and Reason is the correct explanation of Assertion

B

If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

C

If Assertion is true but Reason is fasle

D

If Assertion is false but Reason is true

Text Solution

Verified by Experts

The correct Answer is:
A
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A : Angular momentum of a satellite about a planet is constant . R :Gravitational force is a central force so its torque about the sun is zero .

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.

Knowledge Check

  • Assertion : Angular momentum of a planet is constant about any point Reason : For acting on the planet is a central force.

    A
    If both Assertin and Reason are correct and Reason is the correct explanation of Assertion
    B
    If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion
    C
    If Assertion is true but Reason is false
    D
    If Assertion is false but Reason is true

  • Moment of concurrent forces about any point is constant. If vector sum of all concurrent forces is zero, then moment of all the forces about any point is also zero.

    A
    If both Accertion and Reason are true and the reason is correct explanation of the Assertion.
    B
    If both Assertion and Reason are true but reason is not the correct explanation of Assertion.
    C
    If Assertion is true, but the Reason is false.
    D
    If Assertion is false but the Reason is true.

  • Assertion: Linear momentum of a planet does not remain conserved. Reason: Gravitational force acts on it.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    f both assertion and reason are false.

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    Explore conceptually related problems

    At any point on the right bisector of line joining two equal and opposite charges

    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 : 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 : If angular momentum of an object is constant about a point then net torque on it about that point is zero. R : Torque is equal to the rate of change of angular momentum.

    Statement-1: If the resultant of all the forces acting on a system is zero then the torque on the system about any point is same. Statement-2: If the resultant of the forces acting on a system is zero then acceleration of its centre of mass is zero.

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