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The Mass of the Part of a Metal Rod That S=4x2S=4 x^{2}

Question 145

Multiple Choice

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=4x2S=4 x^{2} . Find the linear density when x is 3 m.


A) 4
B) 20
C) 24
D) 12
E) 18

Correct Answer:

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