Register - Log In
 FunTrivia Homepage New Questions Unanswered Post a Question Goto Qn # Archives

# The following information appeared on the NASA website in regards to its tracking of Cyclone Yasi which was at the time off the coast of Queensland. "It was centered about 1,400 kilometers (875 miles) east of Cairns, Australia, moving west at about 19 knots per hour (35 kilometers per hour, or 22 mph). Cyclone-force winds extend out to 48 kilometers (30 miles) from the center." Spot the error.

Question #120193. Asked by ceetee. (Feb 02 11 6:03 PM)

davejacobs

A knot is a unit of velocity. Knots per hour is an acceleration, but plainly that was not what they meant.

http://en.wikipedia.org/wiki/Knot_(unit)

 Feb 02 11, 6:15 PM
gtho4

"knots" is not a measure of distance, it is a measure of speed

The device that sailors used to make their speed measurement was called the "chip log." Chip as in chip of wood, and log as in to record in a log. The chip was a wedge of wood about 18" in size; it was tied to one end of a rope on a large spool. The rope had knots tied into it about every 47'3" (more about how that was calibrated below).

The wooden chip was thrown overboard at the ship's stern (back end). Because of its wedge shape, it would "grab" the water and start pulling out rope as the ship moved forward at some yet unknown speed. One man would hold the spool of rope as it played out; another man would start a sandglass filled with 30 seconds of sand; and a third man would count the knots as they passed over the stern board. When the 30 seconds of sand expired, the time keeper would call out and the counting of knots would stop.

The faster the ship was sailing, more knots and a longer length of rope were played out. The number of knots in the rope that were counted in 30 seconds, then, was equal to the speed of the ship in nautical miles per hour. A "knot", therefore, is not a nautical mile, it is a nautical mile per hour. Thus 1 knot was equivalent to 1 nautical mile per hour; 5 knots were equivalent to 5 nautical miles per hour; etc. The similar sound of "knot" and "naut" is entirely coincidental.

http://www.onlineconversion.com/faq_07.htm

 Feb 02 11, 6:21 PM

Find something useful here? Please help us spread the word about FunTrivia. Recommend this page below!

 Sign up to see all responses! Create a Free ID instantly to see all recent responses, post your own follow-ups or questions, and access over 1,000,000 trivia questions! Choose a User Name: Your Email Address: Choose a Password: I agree by the terms outlined in FunTrivia's Conditions of Use

### Other Similar Questions & Answers

 What is the speed of the Earth's spin in kilometers per hour, in London?

### Suggested Related FunTrivia Quizzes - 90,000 currently online

1 Moving On
 This is a set of questions that test your knowledge of bands and band members that have separated and gone on to form new bands.
Bands and Musical Acts Average
10 Q
dreamstaman
Aug 16 06
381 plays
2 "Moving On"
 "Three's Company" season 3 episode. The Ropers sold the apartment and had to find a new place to move to.
'Three's Company' - Season 3 Difficult
10 Q
bilig
Feb 15 05
255 plays
3 It's Its!
 One of the most common mistakes editors find in quizzes is confusion over when to use 'its' and 'it's'. If you create quizzes, help me out by taking this quiz! If the usage is correct, pick 'yes', otherwise, pick 'no'.
Quizmaker Tune-Ups Very Easy
15 Q
crisw
Jun 06 00
10878 plays

"Ask FunTrivia" is for entertainment purposes only, and answers offered are unverified and unchecked by FunTrivia. We cannot guarantee the accuracy or veracity of ANY statement posted. Feel free to post an updated response if you feel that an answer is inadequate or incorrect. Please thoroughly research items where accuracy is important to you using multiple reliable sources. By accessing our website, you agree to be bound by our terms of service.