A 40-kg child decides to make a raft out of empty 1.0-L soda bottles and duct tape.Neglecting the mass of the. [Solved]

by

Source(s): high school physics

Since one liter of (fresh) water has a mass of one kilogram, an empty 1-liter bottle
will displace 1 liter, or 1 kg. of water. So you would need at least 40 bottles to
support the weight of the 40-kg. person. I would use a few extra for safetys sake.
Note: a full bottle also contains a slight extra bit of air, so its total internal volume
is slightly over 1 liter, which makes up for the slight mass of plastic

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