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  • Stuck here, help me understand: When a mass is rotating in a plane about a fixed point, its angular momentum is directed along:

When a mass is rotating in a plane about a fixed point, its angular momentum is directed along:

  • Option 1)

    the line perpendicular to the plane of rotation

  • Option 2)

    the line making an angle of 45° to the plane of rotation

  • Option 3)

    the radius

  • Option 4)

    the tangent to the orbit

 

Answers (1)

best_answer

As we learned in

Kinetic energy of rotation -

K=frac{1}{2}Iw^{2}

- wherein

I = moment of inertia about axis of rotation

w = angular velocity

 

 

Angular momentum is axial vector

\vec{L}= m\left ( \vec{v} \times \vec{r}\right )


Option 1)

the line perpendicular to the plane of rotation

This option is correct

Option 2)

the line making an angle of 45° to the plane of rotation

This option is incorrect

Option 3)

the radius

This option is incorrect

Option 4)

the tangent to the orbit

This option is incorrect

Posted by

Aadil

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