## Wednesday, March 10, 2010

### March 10 Problem of the Day

Submarine Dream

When his class was studying World War II, Fred volunteered to research the early history of the submarine. Fred was surprised to learn that the submarine had a rather lengthy history.

William Bourne, a British mathematician, drew up a design for a submarine in 1578. In the early 1600’s, Cornelius van Drebbel used Bourne's plans to build a submergible boat which traveled for short distances under the Thames River. This craft was built out of wood and covered with tightly wrapped sheets of waterproofed leather. It was propelled by oars that extended through its sides.

The first submarine-like boat to be used during wartime was David Bushnell's "Turtle". The Turtle was a one-man wooden barrel-like boat that was powered by hand-turned propellers. It was used during the American Revolution to plant bombs on the hulls of British ships. Although the Turtle was functional as a submarine, the bombs it planted were ineffective.

In 1800, Robert Fulton built the "Nautilus", a military submarine. This submarine was built with copper sheets over steel ribs and hand-powered propellers. It employed tanks that were filled with water to submerge and a horizontal rudder for steering.

It took the Nautilus 2 minutes to submerge. Once submerged, it could travel forward at a speed of 2 miles per hour. The Nautilus held enough oxygen to remain submerged for 17 minutes. Calculate how far the Nautilus could travel forward before its oxygen was exhausted?

1. 17 x 2 =34 miles or feet.

from,
Boccemon

2. He can only go a quarter miles because he summerge 2 minute and he only have 15 minute and 1 hour is 2 miles half hour is 1 mile and 15 minute is quarter of a mile

from flame

3. 17x2=34feet

4. He can only go a quarter. Becuase 1 hour is 60 minutes. So half that is 30 minutes. Half that 15 minutes. Its a quarter because people call 1 forth a quarter and there are 4 part to a whole and 15x4=60. Thats how I got my answer.
Love,
Fitzgerald11

We love it when you leave us a comment!

Please be sure your comment is interesting for others to read and that it somehow adds to the conversation. Be sure to read it after you type it. Does it say what you want it to say? Is it correctly written and spelled?

Please use ONLY your first name when commenting. You may also tell us where you are from or whether you know someone in our class. Examples: From, John, Mr. Pahl's friend, or From, Dawn, Nik's mom, or Sincerely, Mary, a student in Mr. Salsich's class.

Just below the Comment Box is a drop down menu. Select "Anonymous" from the choices; it is the last choice on the list. Then click "Post Comment." In order for your comment to be approved and posted, you should see a message highlighted in yellow that says "Your comment will appear after moderation." If you see a red line after you click Post Comment, your comment did not go through for some reason. Try it again until you see the message highlighted in yellow.

Thank you!