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10 October, 20:57

A raft is made of 10 logs lashed together. Each is 56cm in diameter and has a length of 6.1m. How many people can the raft hold before they start getting their feet wet, assuming the average person has a mass of 69 kg? Do not neglect the weight of the logs. Assume the specific gravity of wood is 0.60.

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  1. 10 October, 21:25
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    n = 87 the number of people can raft hold

    Explanation:

    The raft is made of 10 logs

    No given the information to find the average person assuming

    w = 69 kg, wₙ = 0.60

    e = 56 cm * 1 / 100 cm = 0.56 m

    l = 6.1 m

    V = 10 * 6.1m * (0.56m / 2) ² π

    V = 15.024 m³

    m₁ = V * L³ * wₙ + mₙ

    m₂ = V * L³

    m₁ < m₂

    n < V * (1 - wₙ) * L₃ / w

    n < 15.024 m³ * (1 - 0.60) * 10³ / 69 kg

    n ≅ 87

    Is the number of maximum people
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