Recent content by Oonej

After brute forcing an excel sheet with numbers, i came to the conclusion that there are numerous min and max's ... for instance, a min of 24 a max of ~191, ~780 etc seem to all work, unless i did something wrong in my formulas... but like a velocity > 191 fails, but when its around 700ish, it...

Ok there was a correction to this problem. My TA assigned this project with an error. We are to assume the ball does not change angle after each bounce, the COR only affects the Velocity. If you guys could please shed some light... I took Y0 formula, combined it with the x0 formula, and...

I made a chart with a very HIGH velocity to see the impact. and with an extremely high velocity the ball was still landing under the window. The angle change is what screwed it up.

what velocity allows you to make the window? Because I tried a lot of different combination

Well it just made sense to me when I thought about it :) Not stealing your thunder!

ah! I figured out why the angle changes! the COR does not effect the X direction at all. Just the Y. so with the equation of Tan. it is Tan (theta) = y/x well if the y is affected by the COR, then the new angle is infact changed Tan^-1( y(COR) / x )

Is this ignoring my original assumption that the angle changes upon each bounce? If so, I was aware of that already ;) then someone told me it changes angles...

I will assume at this point that the law of reflection holds. and I can probably solve the whole project now :)

My understanding, not to discredit yours, is that the ball will encounter a rotation. I have had several people say that it does. I have researched it and can't find any proof. So its all hearsay... can anyone provide information on this? If it is the case that the ball doesn't change...

that is using your assumption that the angle doesn't change upon the first bounce.

if you followed the post, we discovered that that the angle -60 degrees, 25 m/s velocity, with the given heights does not work. After further investigation, NO velocity at -60 degree's works. Thus I changed the angle (as it requests in the problem) to -73 degrees. Which works. Now the goal is...

Well, from my understanding, you are saying to solve for t, but we don't know what Uy or Ux is...

yeah the reflecting angle is (COR)(THETA)

Your way doesn't work, when we have 2 unknowns. We can't find T and V at the same time... or can we?

Ok, more progress... y2 = x2 tan θ - [ g / ( 2 v1^2 cos^2 θ ) ] * x2^2 using this formula, and changing the degree to 73 (but keeping the velocity at 25 initially which made it through the window. since i was only allowed to change one variable I made it be the angle) I am getting a...