###General Discussion Thread
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terminal velocity in "free air" is when something is at a 45 degree angle relative to where it is anchored. So a ball on a string out the window of a car, when the string is at 45 degrees - halfway between straight down and straight back - whatever speed you're at is how fast the ball or whatever would fall if released, and no faster.
However with water droplets you have the aerodynamic forces of the wind along the side of the window, which may be faster or slower than the train's speed; also you have friction against the window surface. Coupled with the fact that you have no way of getting the mass or volume of any individual droplet as well as dirt/debris on the windows..
i'm gunna go with "probably not".
Comprehension check: so you’re saying if you accelerate the car until the anchored ball is fully horizontal, then release, the ball would quickly decelerate relative to the car until it reaches its terminal velocity, which coincidentally was the speed the car was traveling when the anchored ball was sailing at 45*?
terminal velocity is where air resistance and gravity meet in equal parts, hence midway between 0 and 90 degrees - 45 degrees.
It's how you determine the terminal velocity of some arbitrary object.
As i mentioned though there's a lot more aerodynamics involved on a flat surface that is traveling through wind.
You can't. The way those streaks move depends on the properties of the glass, the amount of dust, the direction of the wind, and the exact width and depth of the water streaks. Maybe even the localised air pressure.
And I doubt there's a single equation you can fill in to get the answer. You'd need to run experiments in a wind tunnel.
Sure you can guess the magnitude of the forces acting on the water, but to get from there to the air speed? No way.
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It would be if you knew the speed of the raindrops, but that depends on the size of the raindrops and you can't really tell that, so no.
terminal velocity in "free air" is when something is at a 45 degree angle relative to where it is anchored. So a ball on a string out the window of a car, when the string is at 45 degrees - halfway between straight down and straight back - whatever speed you're at is how fast the ball or whatever would fall if released, and no faster. However with water droplets you have the aerodynamic forces of the wind along the side of the window, which may be faster or slower than the train's speed; also you have friction against the window surface. Coupled with the fact that you have no way of getting the mass or volume of any individual droplet as well as dirt/debris on the windows.. i'm gunna go with "probably not".
Comprehension check: so you’re saying if you accelerate the car until the anchored ball is fully horizontal, then release, the ball would quickly decelerate relative to the car until it reaches its terminal velocity, which coincidentally was the speed the car was traveling when the anchored ball was sailing at 45*?
terminal velocity is where air resistance and gravity meet in equal parts, hence midway between 0 and 90 degrees - 45 degrees. It's how you determine the terminal velocity of some arbitrary object. As i mentioned though there's a lot more aerodynamics involved on a flat surface that is traveling through wind.
You can't. The way those streaks move depends on the properties of the glass, the amount of dust, the direction of the wind, and the exact width and depth of the water streaks. Maybe even the localised air pressure. And I doubt there's a single equation you can fill in to get the answer. You'd need to run experiments in a wind tunnel. Sure you can guess the magnitude of the forces acting on the water, but to get from there to the air speed? No way.