Rain is falling vertically . A man running on the road keeps his umbrella tilted but a mn standing on th estreet keeps his umbrella vertical to protect himself from the rain. Both of them keep thier umbrella vertical to avoid the sun rays. explain
2007-01-21 04:00:20 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Physics
The speed of the falling rain is much less than the speed of light(sun rays)
While you are moving forward the rain drops that precede and elude the upright umbrella may drench you somewhere near the chest or below depending on your walking speed..When you keep the umbrella tilting slightly forward you are intercepting the gain drops earlier and your upper part of the body above knees is safe from raindrops..
When sunlight is vertical you need not keep it tilted.During mornings and evenings you may have to tilt the umbrella suitably
2007-01-21 16:39:45 · answer #1 · answered by karikalan 7 · 0⤊ 0⤋
Very simple. It's matter of speed difference. If rain fell at the same speed as light, unbrella will be vertical for both elements. The velocity of falling rain is about 90 miles per hour and a man runs about 9 miles per hour which makes it a 10% vector from vertical. So the ideal angle of the unbrella is 81 degrees. The ratio of speed of light compared to the man running is nearly infinite that there is no difference if he's standing still or running.
lightpulse
2007-01-21 12:19:35 · answer #2 · answered by lightpulse 4 · 1⤊ 0⤋
Assuming they use the umbrellas for different purposes when it's rainy or it's sunny, the difference in umbrella use is explained by the difference in speed of falling raindrops and falling photons.
2007-01-21 12:10:39 · answer #3 · answered by poorcocoboiboi 6 · 2⤊ 0⤋
The rain is traveling at a much slower speed than the light. So the effects of his moving forward must be countered.
2007-01-21 12:13:33 · answer #4 · answered by Anonymous · 2⤊ 0⤋
wen a man is running,air from front pushes him n his umbrlla backwards while wen he is standing ,no such force is acting.
But in case of sunrays,u shud 've mentioned the time of day.
well,if its full noon(12 pm),umbrlla shud be held vertical.
2007-01-21 12:33:51 · answer #5 · answered by Aru(shi) 1 · 0⤊ 0⤋
hi
while you run due to the opposing force by air your umbrella get slightly tilted....
but its not going to happen when you are standing stationary............
2007-01-21 12:15:20 · answer #6 · answered by indu 1 · 0⤊ 0⤋
There are no sun rays when it is raining.
2007-01-21 12:06:01 · answer #7 · answered by Mikhil M 2 · 1⤊ 0⤋
becos when it rain we get wet
and when it is sunny we get sweat
2007-01-23 03:40:55 · answer #8 · answered by funnybhuvana 1 · 0⤊ 0⤋
ask the question its self
2007-01-21 12:09:41 · answer #9 · answered by bdell 1 · 0⤊ 0⤋