The math help thread

Nope, I'm speaking about the product of inertia. I suggest you look closer as I gave you what y is. (looking back at the post one of the equations is incomplete, oops)

Triangle is defined by:
y = 0
x = -b
y = -(h/b)*x

I'd assume y = kx where k = -h/b is the formula for the triangle then. If that's the case, what length is the triangle? Is that given, or is that a variable? (I'm very confused.)

I don't really understand how to do these two Physics problems:

Top: Calculate the force of the pin joint and the tension in the rope.


Bottom: Determine the mass needed to balance the beam in the figure.

Man, I just found a nice hack to use for mathurl.


Edit: Meh, it's not per cm, but per 10 cm. Though, the result doesn't matter.

What kind of collisions are there...?
For simplicity, assume the blocks have a uniform density.

http://en.wikipedia.org/wiki/Collision