Asked by Koketso
You have constructed a raft that is 2 m long,2 m wide,0.100 m thick.if the mass of the raft is 50 kg and your mass is 55 kg,how many 55 kg friends can cross a river with you during one trip?
Answers
Answered by
Anonymous
volume = 2 * 2 * 0.1 = 0.4 m^3
density of fresh water is about 1000 kg/m^3
so it displaces 0.4 * 1000 = 400 kg of water
thus including its own mass it can carry 400 kg
so
400 = 50 + 55 + 55 n
55 n = 295
n = 5.36 friends
If you want to keep the friends I recommend taking 5 and not carving a 6 th up and discarding 0.64 friend.
density of fresh water is about 1000 kg/m^3
so it displaces 0.4 * 1000 = 400 kg of water
thus including its own mass it can carry 400 kg
so
400 = 50 + 55 + 55 n
55 n = 295
n = 5.36 friends
If you want to keep the friends I recommend taking 5 and not carving a 6 th up and discarding 0.64 friend.
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