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Refer to Multiple-Concept Example 11 to see a problem similar to this one. What is the...

Refer to Multiple-Concept Example 11 to see a problem similar to this one. What is the smallest number of whole logs (ρ = 725 kg/m3, radius = 0.0819 m, length = 3.50 m) that can be used to build a raft that will carry four people, each of whom has a mass of 78.0 kg?

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Answer #1

number = N*M / pi*r^2 * L ( water - )

= 4*78 / ( pi*0.0819^2 *3.5*(1000-725)) = 15.38

= 15   

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