Recent content by physicsguy112

Homework Statement A small block slides down a slanted board when released. The upper half of the board is smooth and the lower is rough, so that the acceleration of the block on the smooth half is three times greater than it is on the rough half. The block reaches the bottom of the board in...

I figured it out! The trick was that I need to find the minimum angle for theta, this occurs when the initial angle =0. I got h=((V*tanθ)^2)/2g Thanks so much for your help!

Thank you so much for the help so far. I am really trying to get this one, but I am still lost. I realize now that Vox=V*sina where a=initial angle voy=V*cosa Vfx=V*sina Vfy=V*cosa+Ay*t θ=tan^-1(Vfy/Vfx) but I'm still confused on how to tie a and b together to get an answer in terms of θ.

I am still confused on this problem. Do I need to scrap my whole H= equation? what do you mean by tangent of the landing angle? How does it relate to the initial angle? My answer has to be in terms of θ, and V, so how can I use initial and final angles?

so all I need to do is put Px in terms of V and θ? Is the Voy=V*sinθ and Vox=V*cosθ correct? When u say, decide what the landing angle is, do u mean pick a value for it?

Thanks again for the help, I have uploaded my work and here is the image The key to my work being correct is the assumption that Voy=V*sinθ and that Vox=V*cosθ. I am not sure if those are right. I solved the position function for t. I solved the final velocity equation, and plugged...

Thanks so much for the help. I attempted to solve it, and I got it is supposed to be V*cos theta, not just cos theta I used this equation And delta y is the displacement of y, which I think is H, so I plugged everything into that equation and solved for H. Does this look right? I only...

Do I need to take into account the fact that he threw multiple rocks, and some were at an angle greater then theta?

http://i901.photobucket.com/albums/ac211/dktechguy112/physics131rockproblemab.jpg I redid my drawing, did I accurately represent angles α, β, and θ?

http://i901.photobucket.com/albums/ac211/dktechguy112/physics131rockproblem.jpg I posted up an image of what I think the problem looks like. First off let me say thanks for the help, this forum is awesome! I am just a little bit confused when you say initial angle α and final angle β...

Can I treat this like a projectile problem?

Homework Statement In a sticitly scientific experiment, a student athlete throws rocks out the window in all directions. All rocks have the same initial speed V. It turns out that all rocks' landing velocities make angles theta or greater with the horizontal. Find height h of the window above...