My class is making sailboats out of styrofoam. Basically we are given a block of styrofoam, some plastic bags/wooden dowels for the sails, and a little piece of metal for the keel that is either extremely light or a little heavier, whichever we want. When we have finished constructing them there will be race in which we place the boat in a wooden trough filled with water and fans will blow the boat from one end of the trough to the other.

Question

So can anyone give me some tips on how to make a good boat? Which hull shape would be a best? How can I make it as balanced as possible while still making it speedy?

Answer 1

Tips:

make a keel or centerboard to keep it in a straight line. If the wind is from the stern, then make a sail in the form of a spinnaker (look that up on Google).

Hull shape? smooth lines, I would cover the styrofoam with plastic cloth to make it smooth and low friction. Balanced? Use keel ballast for that.

You can find a lot on this by googling Sailing styrofoam boats fast.
http://www.physclips.unsw.edu.au/jw/sailing.html

Answer 2

I would like help with this math/science question please, I didn't know what subject to pick so I picked Physics.

Question: If a Baterium divides every 20 minutes, how amny bacteria will there be after 4 hours?