haha well... i skipped a grade for math and sciences and was in honors level stuff in MS and HS, and i have a hobbyist type interest, but no... no... freshman physics was all that was required of me and then i was far away from a science field. i can only go so far. somehow i feel like the acceleration or mass equation is a few levels more basic than this haha. but air moving over a metal object would still have an affect on its surface temp, not just human skin. but yea you're right... that, then depending on all the other factors above.
Pretty sure it's no effect up to a point but it's been a while since we've talked about it on here and even longer since I had any science classes where we looked at things like that
Only until it reached ambient temperature, then it would have no effect (assuming we're below the threshold that friction is creating heat) the reason we have "wind chill" is because our bodies are always above ambient temperature... well, until we're not... or if you live somewhere stupid like Arizona.
haha probably have to pick a specific object too. i'm afraid to tweet him, he's gonna be mean (or not respond). i imagine it to be like when people tweet their terrible cooking to Gordon Ramsey hoping for a nice response.
Meh, go for it. Don't add the windchill part tho. Say 30k feet - at what speed does friction start warming an object.
I'm going to change my answer a bit because I was assuming subsonic speeds (motorcycle/airplane). At super high speeds friction doesn't dominate, but pressure or compression heating does. The equations you'll need to know are Bernoulli's Equation (relates pressure, density and velocity), the first law of thermodynamics (relates pressure and density) and an equation for Isentropic Compression (relates pressure and temperature). All of those equations relate the properties of the air flow at two different states. You have three unknowns (the pressure, density and temperature of the second state), but you have three equations so you should be able to solve for them. There are a lot of other effects at such high speeds, but using the above equations you should be able to get a ballpark answer.
It's a rabbit hole for sure (if you're into that kind of thing). The equations are relatively straight forward, but the why is important too (if you're into that kind of thing). Bernoulli's: p1 * .5 * rho1 * v1^2 = p2 * .5 * rho2 * v2^2 First law: p1 * (1/rho1)^gamma = p2 * (1/rho2)^gamma Isentropic Compression: p1^(1-gamma) * T1^gamma = p2^(1-gamma) * T2^gamma p = pressure v = velocity T = temperature rho = density gamma = ratio of specific heats (1.4 for air) What's interesting here is that the velocity of the first state is the speed of the vehicle while the velocity of the second state is 0. This is because you're assuming a reference frame of the front of the aircraft which is slamming into the incoming flow (stagnation point).
The answer is three-fiddy. The answer is always tree-fiddy but if you want to tweet him, ask him about the airplane on the treadmill
Are you kidding? He hopped right up! Wants to be a pilot... “gotta get off this rock” We are staying on St Augustine Beach. I try and time our family vacations with launch dates.
That one is carrying a scientific experiment designed and built by some DFW area public school students.
That's awesome! I wanted to be a pilot too when I was little. I wanted to fly an F16 so bad. Dreams were ruined when I grew over 6' tall in 8th grade . Tell him to keep studying. There's more than one way to get into space if you can't be a pilot. I still haven't made it out to watch a launch. Could you hear it from where you were?
No only see it We did New Smyrna Beach one year and heard it there. Yeah his fallback plan is to be a Ninjaneer...that’s a ninja who’s also an engineer.
