A car driving in the rain at 60 miles an hour. Does it get less rain on it, more rain or the same amount of rain if it were standing still?
because asides from some falling straight down on it, the car also drives into falling water drops in front of it.
Same rain. It doesn't matter if it is moving or stationary. It is under the rain. The time matters though. If you stay more under the shower you get more water.
Because the car now presents a larger surface area to catch the rain. Not only does the rain fall on the roof from directly above - it now also hits the front of the car.
Car doesn't present larger area when it is moving than it is stationary. Same surface, same rainfall...
You explained your assumption. Where is the evidence? Why should I or someone else accept that car has a larger surface depending on angle of rain or movement? Imagine same rain (with an angle or directly downfalling does not matter) hitting a car a) while car is moving b) while car is stationary and you are telling me rain catching changes. If this was the case, car manufacture engineers should have considered that the surface area of their cars would change when it is moving. Is that so. If you are telling me that car is catching the rain before it falls to the ground, please consider the fact that the same car is escaped from the rain behind. So your car has a fixed surface and it covers the same surface on the ground and under the rain. Time makes difference: 5 minutes some rain, 1 hour more rain.
Some surfaces of the car will catch more rain but some will catch less rain. It is feesible that some cars will have a smaller surface area exposed to the rain when moving at 60mph than when stationary. The car will still get hit by more rain however, because the car catches up with more rain than it leaves behind. It would take a peculiarly shaped car to catch less rain when moving! Perhaps some car in the future might.
It's all about the MOTION. or rather, the VOLUME of air the car moves through that contains rain, compared to the volume of rain that falls on the stationary car. All things being equal, the amount that falls on the top surfaces of the car won't vary much if it moving or sat still. But the front of the car sweeps through air containing rain, and therefore the car experiences more rain when moving. It's so simple, how can you not understand this?
Yes, it does. The front of the car now catches raindrops that would otherwise have fallen on the ground before the car.
I am guessing, it depends on the speed of the rain, too. Don't mind me, my math and physic is poor :bawl:
Hold out your hand, fingers pointing upwards. Like this: Please Register or Log in to view the hidden image! Now, imagine the rain coming straight from above while holding your hand still. Next, imagine moving your hand away from you. The vertical surface of your open hand will 'catch' the raindrops.
Are you giving me face palm? Please Register or Log in to view the hidden image! It's kinda difficult for me to imagine this thing without really calculating it.. so let's do a bit calculation.. Say a car has 1 meter square surface (exactly 1 x 1 m2). Then, oranges will be dropped from above to the car with speed of 1 orange per minute per m2 along 60 km length. So... * how many oranges will hit the car if the car standing still for 1 hour in a fixed point? * how many oranges will hit the car if the car travel for 1 hour with speed of 60 km/hour? Please Register or Log in to view the hidden image!
Try thinking of it as air density (very roughly) - a moving car will have a higher density of air at the front than would a standing one, because it's moving into it - but since it's surrounded by air (the rain is coming down all over, not just where the car is), then it won't get any less at the back.
Humm.. ok. How about my question at #17? Do I have to use integral or what? Please Register or Log in to view the hidden image!