2007-01-14 19:20:08 · 10 answers · asked by smm2424 2 in Science & Mathematics ➔ Mathematics
A few answers say the person will go backwards!!! This is obviously wrong. Think about it - 30 mile per hours winds are fairly normal - have you ever been blown away by this level of wind? The difference in time (from my running experience) is likely to be between 1 and 2 minutes - but I would love to see a mathematical explanation.
2007-01-14 20:02:44 · update #1
NOTE: When the man ran 10k in 50 minutes there was no wind.
NOTE: THIS IS NOT A TRICK QUESTION - THE MAN DOES NOT GO BACKWARDS OR GIVE UP - THE DIFFERENCE IN TIME IS LIKELY TO BE AROUND 1 - 2 MINUTES.
2007-01-14 20:34:24 · update #2
Well,you have to specify what was the speed of the wind when he ran 10 Km in 50 minutes.Even after all the calculations a man is not a machine,and you cannot expect him to go backwards if the wind blows at a very high speed.At the most,he would stop running and take shelter somewhere.
2007-01-14 20:14:37 · answer #1 · answered by alpha 7 · 0⤊ 0⤋
This is not the same as a boat moving against a current, where the forward speed is lessened by the speed of the current it is fighting.
A runner won't slow down by 30 mph just because he has a 30 mph headwind. Indeed, nobody can run that fast. But we have all walked into a headwind of 30 mph or faster at some point in our lives.
Indeed running 100 meters in 10 seconds (pretty close to olympic speed) is just 22.4 miles/hour.
2007-01-14 19:30:08 · answer #2 · answered by Northstar 7 · 0⤊ 0⤋
10 km = 10/1.852= 5.4 miles
V = 5.4/(50/60)= 6.48 MPH
against the wind V' = V - Vw = 6.48 - 30 = -23.52 MPH
the wind is too strong the guy is going backwards
LOL
Edit
30 MPH = 56 km/hr
to see what it does see the Beaufort scale
http://en.wikipedia.org/wiki/Beaufort_scale
Ok let us consider the wind blowing against the runner to be "wind resistance" but you have to have the height and measurements of the man to get the area that is undergoing the wind drag
2007-01-14 19:54:18 · answer #3 · answered by Anonymous · 0⤊ 0⤋
25 m
2007-01-18 14:53:29 · answer #4 · answered by Anonymous · 0⤊ 0⤋
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2016-10-07 04:29:27 · answer #5 · answered by ? 4 · 0⤊ 0⤋
That is not enough info to determine any difference but I would add 5 to 10 minutes based on experience.
2007-01-14 19:25:24 · answer #6 · answered by nvr10pts 3 · 0⤊ 0⤋
The same, he's still running 10k in 50 minutes right?
2007-01-14 19:23:21 · answer #7 · answered by Anonymous · 0⤊ 0⤋
he wont finish his run. he is running at 8.333kph and the wind is blowing at 30mph.
30mph>8.333kph if im not wrong, then he will not finish the 10k in the direction he started.
not considering friction.
2007-01-14 19:30:26 · answer #8 · answered by noobie 2 · 0⤊ 0⤋
There is not enough information.
2007-01-14 20:35:00 · answer #9 · answered by gebobs 6 · 0⤊ 0⤋
16min
2007-01-14 19:49:51 · answer #10 · answered by Anonymous · 0⤊ 0⤋