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

question 14

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 $S = 4 x ^ { 2 }$ Find the linear density when $x$ is $3 \mathrm {~m}$ .

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

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