The mass of the part of a metal rod that lies between its left end and a point $x$ meters to the right is
$$S = 4 x ^ { 2 }$$
Find the linear density when $x$ is $3 \mathrm {~m}$.

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The Answer of The mass of the part of a metal rod that lies between its left end and a point $x$ meters to the right is
$$S = 4 x ^ { 2 }$$
Find the linear density when $x$ is $3 \mathrm {~m}$.

The Mass of the Part of a Metal Rod That xxx

The Mass of the Part of a Metal Rod That $x$