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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

View full answer

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