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YumYum247
 one year ago
elp please!!!!
YumYum247
 one year ago
elp please!!!!

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YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0Can someone please check question number 41 for me plz?!?!?!!?!?

dan815
 one year ago
Best ResponseYou've already chosen the best response.1can i suggest one thing

dan815
 one year ago
Best ResponseYou've already chosen the best response.1it might look like its less work with the formulas and stuff, but there is a simpler way to think about these questions, even though the work might seem like its a bit more

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0i don't care, spit it out!!!!

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0ive already done that....how do i figureout the horizontal displacement of the projectile.....??? :)

dan815
 one year ago
Best ResponseYou've already chosen the best response.1now u know the horizontal speed Vx, so what we need to do is find the time it is in the air for, and multiply by that time

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0yes those are the initial vertical velocity and initial horizontal velocity.....

dan815
 one year ago
Best ResponseYou've already chosen the best response.1and to find how long its in Air for, we know the Vertival speed and we have the accerelation

dan815
 one year ago
Best ResponseYou've already chosen the best response.1one thing about the launch is that the starting and ending speed for the vertical is the same

dan815
 one year ago
Best ResponseYou've already chosen the best response.1jstu the direction is opposite

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0yup i know that.... :)

dan815
 one year ago
Best ResponseYou've already chosen the best response.1so what we need to do is see the time it takes for the velicity to go to 0 and mulitply by 2

dan815
 one year ago
Best ResponseYou've already chosen the best response.1our acc is 9.8 m/s/s so Vy= 35*sin 40 lets see how long that takes to go to 0 34*sin 40  9.8*t = 0 every second we are going to lose 9.8 see how many secs that will take find that time multiply by 2

dan815
 one year ago
Best ResponseYou've already chosen the best response.135*sin 40  9.8*t = 0 t=35sin(40)/9.8 it will be up in air twice that time so our horizontal distanve must be ? Vx*2t = 35*cos(40) * 2*35sin(40)/9.8

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0buddy that's not even closr to the real answer!!!

dan815
 one year ago
Best ResponseYou've already chosen the best response.1maybe some error somewhre xD

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0the answer is 40m.....

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0we're looking for the horizontal displacement of the ball....

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0so we figure out the time and plug that into the horizontal equation.... D = t/v or something like that....

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0here is the solution......wait

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0actually this topic is slightly different, its about the chaning velocity and the angle....and to find the horzontal displacement we use the formula Dh = Vi2 X sin2O/a but i wanna know what is the Vi means here....

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0is it the initial horizontal velocity or the initial vertical velocity??????

dan815
 one year ago
Best ResponseYou've already chosen the best response.1dont use formulas just learn it

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0because i'm pluging in the number and both of my x and y comps are different :( cuz when i ply them into the equation i get a differentt answer :(

dan815
 one year ago
Best ResponseYou've already chosen the best response.1i think the answer there is wrong

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0i wanna know what is the Vi2 means here????

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0vertical or horizontal......

dan815
 one year ago
Best ResponseYou've already chosen the best response.1what are u referring to again

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0hold up.....le me draw for you :)

dan815
 one year ago
Best ResponseYou've already chosen the best response.1wait i found the mistake they made

dan815
 one year ago
Best ResponseYou've already chosen the best response.1i think they plugged in wrong numbers or something because they ahve wrong horizontal and veritcal components

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0dw:1439952832199:dw

dan815
 one year ago
Best ResponseYou've already chosen the best response.1yes that is the right one

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0those are my numbers...when i plug them into their equation, i don't get the right answer????

dan815
 one year ago
Best ResponseYou've already chosen the best response.1did u get the method i was showing u up there?

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0i've tried both but i ain't getting 40m :"(

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0yuss i already know that method.....

dan815
 one year ago
Best ResponseYou've already chosen the best response.1i did it twice so it has to be right

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0well what do you get when you pplug in your findings into the formula, do you get 40?

dan815
 one year ago
Best ResponseYou've already chosen the best response.1i dont use formulas i dont know, id have to derive it

dan815
 one year ago
Best ResponseYou've already chosen the best response.1what formula do u want me to derive?

dan815
 one year ago
Best ResponseYou've already chosen the best response.1u want a formula with velocity and distance only?

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0change in horzontal displacement = Vi^2 X Sin2 Theta/a

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0normally i label my vertical values and horizontal values.... Vertical: Horizontal: a = 9.8m/sec2 dh = ? Dh = 0m/s Vh = 26.81m/sec Vi = 22.49m/s up t = ? Vf = 35m/sec t = ?

dan815
 one year ago
Best ResponseYou've already chosen the best response.1now look maybe u can help work this out

dan815
 one year ago
Best ResponseYou've already chosen the best response.1wait why is there a Vf=35 that doesnt eexist

dan815
 one year ago
Best ResponseYou've already chosen the best response.1Vertical Vi=22.49m/s up Vf=22.49m/s down

dan815
 one year ago
Best ResponseYou've already chosen the best response.1now tell me how much time that will take with 9.8m/s^2 acc

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0i just need to find time, so for that i can use the following dy = Vi X t + 1/2(aXt^2) i'll get a qudratic expression and fro mthere i get my time....i ply that time into the horizontal equation = V = d/t => "t = d/V"

dan815
 one year ago
Best ResponseYou've already chosen the best response.1can u just answer this simpler qusetion first please

dan815
 one year ago
Best ResponseYou've already chosen the best response.1Vertical Vi=22.49m/s up Vf=22.49m/s down how much time will this take? from this Vi to Vf?

dan815
 one year ago
Best ResponseYou've already chosen the best response.1remember acceleration =V/t right

dan815
 one year ago
Best ResponseYou've already chosen the best response.1so how much time will it take "Vertical Vi=22.49m/s up Vf=22.49m/s down how much time will this take? from this Vi to Vf? "

dan815
 one year ago
Best ResponseYou've already chosen the best response.1okay how much total change was there in the velocity

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0wait we have 2 velocities here Vi and Vf so which one am i going to use for that....??

dan815
 one year ago
Best ResponseYou've already chosen the best response.1accerelation = change in velocity / change in time

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0OMG i got it..... LOL

dan815
 one year ago
Best ResponseYou've already chosen the best response.1so how much did the time change by?

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0dw:1439954092459:dw

dan815
 one year ago
Best ResponseYou've already chosen the best response.1so this means it took 4.5 seconds for it go up and down

dan815
 one year ago
Best ResponseYou've already chosen the best response.1in this same time it was constantly moving horizontally at some speed

dan815
 one year ago
Best ResponseYou've already chosen the best response.1Horizontal speed * ~4.5 = distance in the horizontal v*t=d

dan815
 one year ago
Best ResponseYou've already chosen the best response.1its oka if the answer does not match the one in the book because that one is wrong, i can show u with a simple thought experiment

dan815
 one year ago
Best ResponseYou've already chosen the best response.1go online and look at a football being kicked in the air, see the approximate time

dan815
 one year ago
Best ResponseYou've already chosen the best response.1it just cannot be 40m meters that is too close

dan815
 one year ago
Best ResponseYou've already chosen the best response.1they will fire him if tahts the best he can kick it

dan815
 one year ago
Best ResponseYou've already chosen the best response.1this is an opening kick off

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0no but the thing is that, this chapter covers chaning angle and velocity...so to find the hori\ontal displacement .....they gave us the formula for that.....

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0i was just following the steps....

dan815
 one year ago
Best ResponseYou've already chosen the best response.1i wouldnt worry about all that stuff trust me, you should check out the MIt physics lectures they teach kinematics properly

dan815
 one year ago
Best ResponseYou've already chosen the best response.1There is only 2 real formulas u need to know for this whole course

dan815
 one year ago
Best ResponseYou've already chosen the best response.1d(t)= displacement as a function of time d'(t)= velocity, first derivative of displacement is velocity d''(t)=acceleration, 2nd der of displament is acc from these you can get all of kinematics equations

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0so what do i do in the exams cuz this chapter and the previous chapter literally had the same types of questions....where you have the final velocity, angle and maybe one or two thingsg from the horizontal.....but virtually exactly the same types of question.....

dan815
 one year ago
Best ResponseYou've already chosen the best response.1dont worry, for all those u just need some geometry and these principles

dan815
 one year ago
Best ResponseYou've already chosen the best response.1try some more questions, post it on here if u are stuck

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0cuz i picked a question from my previous chapter on "upward movign projectiles" and applied the formula from this chapter" Changing launch angle and initial velocity....the answer i got was totally different,......

dan815
 one year ago
Best ResponseYou've already chosen the best response.1wait u got 50 something right

dan815
 one year ago
Best ResponseYou've already chosen the best response.1what u got there is the change in vertical distance

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0sorry different question.....

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0i'll post it if i have the energy....

YumYum247
 one year ago
Best ResponseYou've already chosen the best response.0eye eye captain....:"D
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