i have always wondered this and sometimes people tell me the answer, but because it usually varies from person to person and never comes with a definitive reason i don't feel confident that i know
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i have no idea, but i think you'd get hit more by moving faster.
think of it vectorially, in the xz plane. x is the ground surface and z is elevation. let a point R be a raindrop and a vertical line Eva be you. say that your land speed is given by S and a raindrop falls at a speed of T. when you stand still, the vector equation for the raindrop in relation to you is given by something like 0i - Tj: a vertical line. unless R's starting x-value is equal to Eva, the raindrop will not hit you.
now set Eva into motion. this gives the raindrop in relation to you a vector equation of Si - Tj. vector addition will give you a diagonal line, meaning if you are of infinite height, all rain that falls will hit your front parts in motion
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If you spread your arms out, it probably doesn't matter. The amount of rain and wind conditions are probably a factor, too. You should do a study. Time to bust out the clipboards!
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think of it vectorially, in the xz plane. x is the ground surface and z is elevation. let a point R be a raindrop and a vertical line Eva be you. say that your land speed is given by S and a raindrop falls at a speed of T. when you stand still, the vector equation for the raindrop in relation to you is given by something like 0i - Tj: a vertical line. unless R's starting x-value is equal to Eva, the raindrop will not hit you.
now set Eva into motion. this gives the raindrop in relation to you a vector equation of Si - Tj. vector addition will give you a diagonal line, meaning if you are of infinite height, all rain that falls will hit your front parts in motion ( ... )
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like, running, your back is dry.
but moving slow, whole deal, but not as intense.
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