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

  • a line perpendicular to the plane of rotation

  • the line making an angle of 45o to the plane of rotation

  • the radius

  • the tangent to the orbit

Answer

A.

a line perpendicular to the plane of rotation

We knows  L = m (r x v)
So, here, angular momentum is directed along a line perpendicular to the plane of rotation.

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Some More Questions From Units and Measurement Chapter

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Give four examples of physical quantities.

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