Anyone here go to collage?
2 2017-12-12 by makesmefez
Can anyone answer this and show the work? I just need it by tonight. I am trying to get a degree so I can get out of Panera. This is way fucking beyond me.
Eyjafjallajokull is a volcano in Iceland. During a recent eruption, the volcano spewed out copious amounts of ash.One small piece of ash was ejected from the volcano with an initial velocity of 368 ft/sec.The height H, in feet, of our ash projectile is given by the equation: H=-16t2+368t, where t is the time, in seconds. The graph of this equation will be a parabola. We will assume that the volcano has no height. i.e H=0 at t=0. When does the ash projectile reach its maximum height? What is its maximum height? When does the ash projectile return to the ground?
34 comments
1 redtheftauto 2017-12-12
Hope this helps https://youtu.be/WW-9TcDTKa8
1 makesmefez 2017-12-12
Not even a little bit.
Thanks.
1 redtheftauto 2017-12-12
No problem
1 867-5309- 2017-12-12
It's college, not collage...
1 makesmefez 2017-12-12
Huh.
1 Toss__Pot 2017-12-12
I think if you plot it, it will become more apparent.
1 goo-gobbler 2017-12-12
The equation makes no sense, it's not a parabola. Drop out. https://i.imgur.com/Wgy3vrW.jpg
1 makesmefez 2017-12-12
It cut and pasted kind of wrong, I see. Its really:
H= -16t2 + 368t
not 2+368t
1 goo-gobbler 2017-12-12
https://i.imgur.com/0aAkvgc.jpg
To get the max H value using the equation, take the derivative and find t, i.e. dH(t)/dt = 0
Come on dude, this is high school shit.
1 makesmefez 2017-12-12
I know its high school shit. I never paid attention then, and that was 24 years ago. Jumping back in has been a bit difficult.
Am I a fuckin retard if I don't know this shit? Honestly, how many people here really get this?
1 packitchofsositch 2017-12-12
It's been decades here too, but I'm pretty sure the -16 had something to do with gravity decelerating the velocity.
I'm pretty sure you just need to know some coefficient to plug in, but if it's not freefall speed, fuck if I'm looking for it.
1 goo-gobbler 2017-12-12
1/2 * a *t2 + Vo * t + do
a = gravity (negative)
Vo = initial velocity
do = initial height
You might be looking for the terminal velocity (Vt), where you need a drag coefficient (Cd).
Vt = ( 2mg / (rhoACd) ) 0.5
1 buryonedeep 2017-12-12
Goo-gobbler is the Einstein this sub deserves.
1 makesmefez 2017-12-12
I guess. Holy shit.
1 goo-gobbler 2017-12-12
PM me anytime if you need some help buddy.
1 makesmefez 2017-12-12
Thanks man.
Thankfully, my Algebra shit is done after this last assignment. It was just a general I had to take. Trying to get an associates in IT for no particular reason other than I am bored and if i get canned in the car parts world, I don't actually have to go to Panera.
1 packitchofsositch 2017-12-12
Ah there is goes. ft/s2 + ft/s * s
1 blackirishlad 2017-12-12
that's ridiculous, you don't need a drag coefficient for this type of problem. they never ask that.
1 goo-gobbler 2017-12-12
Yeah of course not. I just wasn't sure what the other guy was getting at. The first equation there assumes gravity is the only force.
1 yismeicha 2017-12-12
It's been 15 years since high school and I don't know what the fuck I'm looking at. I didn't back then either.
1 packitchofsositch 2017-12-12
This isn't really high school stuff, even though it looks simple. It's the difference between single variable and multi-variable. The actual title of the textbook for my entire Calculus I course was "Single Variable Calculus". The multi-variable stuff didn't come until calc 2.
Notice how you have to solve for height and time? That's multi-variable.
1 yismeicha 2017-12-12
I don't even know what calculus is
1 packitchofsositch 2017-12-12
I think it's got to do with young men killing each other.
1 yismeicha 2017-12-12
I believe that.
1 packitchofsositch 2017-12-12
Tbh I barely know either. But I do know one thing.
I asked my Calc I professor some question. I don't remember what it was. But his answer was to tell me to look at the cover of my textbook and tell him if I noticed anything. Like a cow, I looked, and told him I didn't notice anything, because I honestly didn't. He held up his copy with the cover towards the class, took his finger and popped it several times on the title. Then I got it.
I never forgot that shit.
1 packitchofsositch 2017-12-12
I forgot what freefall speed is. 120-something, but I can't even remember if it's mph or ft/s. Either way you'll probably need to plug it in somewhere for the last question?
1 goo-gobbler 2017-12-12
Mass is only relevant if air resistance, or any other force other than gravity, is involved. Let's pray he doesn't have to deal with that. And yeah he fucked it up
1 A_Friendly_Creeper 2017-12-12
Don't ask me because I have a useless liberal arts degree.
1 ryanindayton 2017-12-12
I think I need ballistic coefficient and mean density? You know, variables.
1 3stepsbackward 2017-12-12
I used to be so good at this stuff back in high school. Now it's like a foreign language.
I also could have been a model.
SNIFF
1 aegrotatio 2017-12-12
You mean creating artwork by gluing different things to a sheet of construction paper? Yes.
1 blackirishlad 2017-12-12
i'm not falling for this poor copy and paste job, this is beginning of the semester physics I shit and the school year is over.
1 UnfunnyFaggott 2017-12-12
Differentiate the the position function, this will give you the velocity. Find the t where the velocity is is 0, and this will give you a local max for the position function. This will be the maximum height.
1 packitchofsositch 2017-12-12
I wonder if you can do that shit without a stupid graphing calculator. The other guy said take the derivative. Different paths to the same end, or more or less the same path?
1 enzo_trash 2017-12-12
im a fucking retard
1 goo-gobbler 2017-12-12
PM me anytime if you need some help buddy.
1 packitchofsositch 2017-12-12
Tbh I barely know either. But I do know one thing.
I asked my Calc I professor some question. I don't remember what it was. But his answer was to tell me to look at the cover of my textbook and tell him if I noticed anything. Like a cow, I looked, and told him I didn't notice anything, because I honestly didn't. He held up his copy with the cover towards the class, took his finger and popped it several times on the title. Then I got it.
I never forgot that shit.