Recent content by jcpwn2004

Alright but even if i know my H, isn't the theta different? let's say my H is 7.5 cm. I got theta/2 for the left triangle to be 4.86 degrees. Where do I go from there though?

Alright well we aren't given H so how would I theoretically get H? Would I do 5/14.6 = h/d? And after I find D how would i find theta?

Alright so my camera's length is 14.6cm and the film height is 5cm. Even if I know they're proportional how can i find D?

Homework Statement I'm supposed to quantify the picture below and show how to find D and the angle theta. http://img10.imageshack.us/img10/7079/labg.jpg Homework Equations none i can think of The Attempt at a Solution I guess S and H are the same. I really can't think of a...

Ok so the main point of the one on the bottom is that the lines curve to the left as the nodes split away from each other? And then for the T one they all just curve towards the negative node on the right?

Homework Statement Hey I'm supposed to draw electric fields for this problem and I can't figure these 2 out. Homework Equations There really isn't any. The Attempt at a Solution It's included in the picture http://img135.imageshack.us/my.php?image=physicsge1.jpg

thanks for all the help :)

Don't I know the magnitudes since it's stationary though? Shouldn't the friction force be larger than mgsin0 since it isn't sliding down the ramp? Also don't I know that the normal force is equal to the perpindicular force (mgcos0)?

So if my problem said to find the velocity from this graph at 2 seconds I would find dx/dt at 2? I understand the velocity at 2 is 20 m/s i just don't know how to show my work for it. Would i do like V = Δx/Δt so V = (50-30)/(2.5-1.5) = 20 or something like that? Also what could i do to...

So for my drawing if i drew arrows would it be accurate? And then for the second part what would i do because if Δ -> 0 then it will be undefined. SHould i do like a limit or something?

Homework Statement Draw and label the free body diagram of a block on a plane inclined 30 degrees from the horizontal. There is friction and the block is stationary. The magnitues of the vectors must be correctly scaled and the directions correct. And then my other question is how to find...

I have a derived equation for latent heat, L = kIV∆T/∆M. I was just wondering what the value for k is. I have it written down in my notebook but i can't tell if i wrote a 2 or a 7, so it should be .239 or .739. If anyone knows it'd be appreciated, thanks.

I did a=L(wavelength)/Y so .005=L(400nm)/.002 and got L=25m which is off, the final answer should be 20.5 Is my answer for part a correct though?

the diffraction effects would be less for larger wavelengths, therefore larger wavelengths would blend the fastest? So red would be the first color to blend? for the 2nd part i have sin0=1.22(wavelength)/D and used 480nm for violet light and got .06 which isn't right :(.

Homework Statement http://img73.imageshack.us/img73/2750/physicsnm5.jpg Homework Equations asinO=m(wavelength) The Attempt at a Solution I don't really know where to start...