liyahmakay1853
31.03.2020 •
Physics
A raft is made up of 10 logs attached together. Each is 38 cm in diameter and has a length of 6.1 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 600 kg/m3. (15 pts)
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Ответ:
Explanation:
volume of each raft = cross sectional area x length
= π r² x L , r is radius of raft and L is length
= 3.14 x .19 x .19 x 6.1
= .69 m³
total volume of 10 raft = 6.9 m³
mass of raft = 6.9 x 600
= 4140 kg
Let no of person which can be balanced be n
weight of n person = 70 n
total weight = 70 n + 4140 kg
buoyant force when whole of raft is submerged in water
= volume of displaced water x density of water x g
= total volume of raft x density of water x g
= 6.9 x 1000 x g
for equilibrium
buoyant force = total weight of raft and persons
6.9 x 1000 x g = (70 n + 4140 ) x g
6900 = 4140 + 70n
70n = 2760
n = 40 approx
Ответ:
c. i think im not entirely sure