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Question

(A) The angular momentum $\vec{L}$ of a particle is defined by the cross product of its position vector $\vec{r}$ and its linear momentum $\vec{p} = m

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a line perpendicular to the plane of rotation

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(A) The angular momentum $\vec{L}$ of a particle is defined by the cross product of its position vector $\vec{r}$ and its linear momentum $\vec{p} = m\vec{v}$,given by $\vec{L} = \vec{r} 	imes \vec{p}$.Since $\vec{r}$ and $\vec{v}$ both lie in the plane of rotation,their cross product $\vec{L}$ must be perpendicular to both $\vec{r}$ and $\vec{v}$ according to the right-hand rule.Therefore,the angular momentum vector is directed along a line perpendicular to the plane of rotation.

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

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