Recent content by Froster78

Ok, I think I have a better idea... Sorry I'm really using this to help myself as well. If you find two points, say (0,0,0) and (1,1,1) just using arbitrary points on your plane. You can construct a vector using the initial and terminal points. This vector should be parallel to the plane. You...

A cross product of two vectors perpendicular to the plane will give you a vector parallel to the plane.

I've been thinking about this one for a bit. If you had another vector perp to the plane you could use a cross product. Also, you might have more luck on the calculus page.

Cool!

It's hard to tell where you've gone wrong without seeing your attempt at the solution.

No, you have already found the PE for just one sphere due to the other 3. I haven't checked numbers but your method looks sound.

No problem!

You're looking for the velocity of only one sphere, so shouldn't be 1/2mv^2

are you using 2mv^2 because there are four spheres? I think what you calculated is the PE for one sphere right?

Spot on! now you have only v0 and a to find, there might be some other formulas that you can compare to this one. Keep going and you'll figure it out.

what is your v at t=2?

that sounds good... you know your v after t=2...

I would assume you are to neglect air resistance so a good place to start would be constant acceleration formulas.

Have you tried anything thus far? What equations do you know that relate your unknown variables?

Yeah, I agree that vectors would be the best way to do this. Unfortunately we are supposed to use the "non vector" method. Although I am comfortable with vectors for the most part the class has just started teaching them. I think I see where I was wrong. I believe the equation that i need to use...