Recent content by mustang1988

ok thanks for the help

O ok, so M would be equal to wL2/8+540w?

Thats supposed to be a 3ft from P to the edge, sorry my drawing skills are not great. I already did the M diagram that is where i came up the max of 575. I just don't know how to solve for the w.

[b]1. Determine the allowable uniform load w if the allowable bending stress is 24ksi and P=15w Given: I=12,800in^4; c=16.965in [b]2. I know that Mmax=\sigmamax/c(I); And Mmax=wL^{2}/8 [b]3. I solved for Mmax=18,107.869 k in; but I don't understand how to solve for w with the...

[b]1. When blue light of wavelength 450 nm falls on a single slit, the first dark bands on either side of center are separated by 51.5°. Determine the width of the slit. [b]2. sin\theta=\lambda/w [b]3. w=450e-9/sin(51.5)=5.75x10-7 I tried this but it said it was wrong, if...

Ok, that makes a lot more sense. Thanks

Ok so I know f is 70mm and do is the 13.2,3.2, and 1.9 and I am supposed to solve for di but I don't understand what the film plane of 120mm is for.

[b]1. A 70 mm focal-length lens is used to focus an image on the film of a camera. The maximum distance allowed between the lens and the film plane is 120 mm. How far ahead of the film should the lens be if the object to be photographed is at the following distance from the lens?When it is 13.2m...

I knew it would be something dumb, thanks for your help.

b]1. A light beam coming from an underwater spotlight exits the water at an angle of 68° to the vertical. At what angle of incidence did it hit the air-water interface from below the surface? [b]2. snell's law n1sin\Theta1=n2sin\Theta2 [b]3. sin\Theta1=1.33(sin68) After doing this...

what is Kirchoff's current law and voltage law? they're not in my book

2.5ohms is the total resistance? I thought that was just the resitence in the wire going from the battery and the wire going to the battery

[b]1. Eight lights are connected in parallel to a 119V source by two leads of total resistance 2.5 ohms. If 240mA flows through each bulb what is the resistance of each? What fraction of the total power is wasted in the leads? [b]2. V=IR, P=I^2(R) [b]3. V=.24(119)=495.83/8=62ohms...

yeah i know what a freebody diagram is i just don't understand what members i am looking for the tension and compression in? And if the force is just the two forces listed?

when you say truss member do i use the momentum to find it? And do the two rollers have x and y components or are they irrelivant?