Recent content by thursdaytbs

I have a positive and a negative charged plate running parallel to one another. To find the Electric Field to the left of the plates, I say: E dot dA = Qenclosed / permittivity Then E times 2pi(r) = Qenclosed / Permittivity then E = Qenclosed / 2pi(r) x Permittivity and since Qenclosed...

I'm asked to derive the mathematical expression for the erlationship of centripetal force as a function of T, m, and R. I've found, from data, that F=0.615/T^2 = 0.05m = 1/4R how would I bring it all together to form one equation involving T^2, m, and R? Any help, thanks.

Opps, lmao. huge mistake, I totally meant to write 20mi/hr. Anyway. Thanks!

If Car A is going 30mi/hr east, and Car B is going 10mi/hr east. What is the relative velocity of Car A to Car B? Wouldn't this just be Va - Vb = Vrelative? So.. 30mi/hr - 10mi/hr, the answer would be 20mi/hr? Any help, thanks. :smile:

But the problem should not be this easy. Our teacher had said that it's not what you think it is. Therefore, I had come up with this, which doesn't come out to make sense for some reason. Maybe someone could point out why? Average Speed = Distance Traveled / Time it took to travel S1 =...

You move from point 1 to point 2, and then from point 2 back to point1, using the identical path. if your average speed from point 1 to point 2 is S1 and the average speed from point 2 back to point 1 is S2. What's the average speed of the entire trip there and back, in terms of S1 and S2...

Conservation of Momentum. Initial momentum must equal final momentum. Therefore... (mass)x(velocity) = (mass)x(velocity) or... (massA)x(velocityA) + (massB)x(velocityB) ... (massX)x(velocityX) = (massA)x(velocityA) + (massB)x(velocityB) ... (massX)x(velocityX)

How would you go about finding a perpendicular vector, to two 3 dimensional vectors? One way, I solved is using the cross product of the two vectors. Splitting the i's j's and k's up and solving using a determinent. But, what's another way to do it?

awsome, thanks a lot.

OK another thing I've thought up is saying... F = Y(delta-Laluminum / L-naught)A and F = Y(delta-Lsteel / L-naught)A since force is equal throughout? Then set the two equations equal to one another, where A cancels out? Can anyone confirm this is a way of doing it?

If Aluminum and steel are connected as one rod, and are attached to the wall and is pulled upon. How would the change in length for each material of the rod be calculated? I'm given that the Aluminum section is twice as long as the steel section, and the total change in length of the whole rod...

The ditto the teacher handed out to us was not his. A previous teacher had made it, and people were asking about it today, and for him to help us with it. He put it on the board, looked at it, and said - forget it, omit it. although he said he may give extra points for it solved. Hurkyl - I...

Okay, I'm in Precalculus Honors, and have not learned about Derivatives yet, and this is an extra credit problem. I've gathered that you must find the derative of the curve at the point of tangency, and that is the slope of the line. I'll google some more, but any help?

Write the equations of the tangent lines from (3,0) to x^2 + 2y^2 = 6 Anyone have any idea? I've graphed it but i still have no clue where it's tangent to the elipse.

If 15eV photon interacts with a Hydrogen atom at groundstate [-13.6eV], and all 15eV is transferred to the atom. How would the KE of the ejected electron be found? and what is the de Broglie wavelength of the electron? For the Kinetic Energy, i said 15eV = KE + 13.6eV, KE = 1.4eV for the...