There is a certain kind of rope which takes exactly one hour to burn from end to end. The rope is not uniform, not symmetric - thicknesses throughout its length vary randomly. No two such ropes will be identical.
You have two such ropes. How will you measure 45 minutes?
2007-03-09 20:10:32 · 4 answers · asked by mike 1 in Science & Mathematics ➔ Engineering
Start burning the both ends of the first rope and one end of the second rope at the same time. The moment the first rope burns out, start burning the other end of the second rope. It will be 45 min when everything burned out.
2007-03-09 20:27:44 · answer #1 · answered by sciquest 4 · 3⤊ 0⤋
Weigh and measure the rope first before starting the combustion process. Then start the burn process. Exactly after 45 minutes, stop the process and weigh and measure the rope. You can now use the laws of proportions to find the length of the remaining rope.
Hope this helps.
2007-03-10 18:16:06 · answer #2 · answered by Anonymous · 0⤊ 0⤋
LITE one rope at both ends , double lite rope will burn in thirty minutes, or is this the one you say look at a clock, i think the whole thing is getting on my wick not my day today
2007-03-10 04:39:43 · answer #3 · answered by ufo18 4 · 0⤊ 0⤋
challenging task. do a search at yahoo. just that may help!
2014-11-07 00:31:27 · answer #4 · answered by Anonymous · 0⤊ 0⤋