The Mass of Part of a Wire Is $x ( 1 + \sqrt { x } )$

question 36

Multiple Choice

The mass of part of a wire is $x ( 1 + \sqrt { x } )$ kilograms, where $x$ is measured in meters from one end of the wire. Find the linear density of the wire when $x = 36 \mathrm {~m}$ .

• A) \(6 \mathrm {~kg} / \mathrm { m }\)
• B) \(4 \mathrm {~kg} / \mathrm { m }\)
• C) \(9 \mathrm {~kg} / \mathrm { m }\)
• D) \(1.5 \mathrm {~kg} / \mathrm { m }\)
• E) None of these

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