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Why the centre of gravity coincides with...

Why the centre of gravity coincides with the centre of mass only if the size of the body is small ?

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g does not vary from point to point.
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  13. vecA=(hati-2hatj+6hatk) and vecB=(hati-2hatj+hatk), find the cross pro...

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  14. Find a unit vector in the direction of vector vecA=(hati-2hatj+hatk)

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