A raft is made of 13 logs lashed together. Each is 28 cm in diameter and has a l

Question

A raft is made of 13 logs lashed together. Each is 28 cm in diameter and has a length of 6.4 m. How many people can the raft hold before they start getting their feet wet, assuming the average person has a mass of 70 kg? Do not neglect the weight of the logs. Assume the density of wood is 600kg/m3
A raft is made of 13 logs lashed together. Each is 28 cm in diameter and has a length of 6.4 m. How many people can the raft hold before they start getting their feet wet, assuming the average person has a mass of 70 kg? Do not neglect the weight of the logs. Assume the density of wood is 600kg/m3

Explanation / Answer

V = N*A*L = 13*(p*.16²)*5.4 =5.6458 m³ Fb/g = (?w - ?l)*V = (1000 - 600)*5.6458 = 2258.32 kg Np = (Fb/g)/(m/p) =2258.32/70 =32.26 Np = 32

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