Recent content by kyva1929

Hi, I've been accepted to few places so far and would like input for selection. Background: I did few years of research as an undergraduate in the CMS experiment, and I would like to continue doing research in experimental particle physics, though not necessarily in LHC. Caltech: They are...

Hi! Can anyone recommend a text that goes through calculation in fall time, rise time, saturation time and final rise time thoroughly with some examples provided? I've looked through microelectronic circuit design by Jaeger / Neamen, they briefly mention the concept at best but do not have...

Energy level of hydrogen atom -- with the electron replaced by a positron The energy level of a hydrogen atom is given by (without fine structure consideration) Eh = -13.6 eV / n^2 Suppose -- if the electron is replaced by a positron, what would happen to this energy level? The resulting...

Thank you so much! I'm a newbie and am still not used to approximation technique, thanks for the great help!

Can you show me how you arrive at the expression for U? I've tried to derive U from force consideration, the resulting expression looks way too complicated. The expression obtained by merely adding the potential energy from both springs is still too complicated as well. Thanks for your help :)

Homework Statement Attached Homework Equations 5.104 mentioned in the problem is Also attached The Attempt at a Solution Suppose the mass is moved to (x,y), the distance from the mass to the left spring is denoted by A, the distance from the mass to the right spring is denoted...

Homework Statement Please see the attached image Homework Equations I'm stucked in part B, asking me to show that the combined potential energy of spring and gravity can be written in the form of 1/2ky^2 The Attempt at a Solution integrating -(-ky+mg) with respect to y, from y_0...

I got it, thank you very much!

Using u=x-t, du=-dt, and the integral becomes -(x-u)*f(u) du integrating from x to 0, but now I am not sure how it could be integrated to some useful form relating it to 1-cos(x) ?

http://img686.imageshack.us/img686/7320/clipboard01by.png I am just lost at how to use the given information to find out the required integral. I've tried fundamental theorem of calculus, substitution, and integration by parts, but they do not seem to work for me. Thank you!

That 0.666W came from (0.5 cos(10) + sin(10)), the reaction force from log, and I forgot to multiply it by 1.25ft. The equations listed was based on the FBD of only the tractor. The direction of friction is indeed confusing to me in this problem. When the problem ask to find out the maximum...

I'm able to solve for the correct maximum weight using the following equation: Force required to move the log: W*cos(10)*0.5 + W*sin(10) taking moment about point B: -N_a*10 + 0.666W + 8000*cos(10)*(3) + 8000*sin(10)*2.5=0 summation of force about the axis parallel to the inclined...

Mechanics statics problem-- help http://img686.imageshack.us/img686/8831/45170185.jpg I've tried to solve for the maximum weight using moment equation about point A, and it gives way too large value of W as compared to the answer 836lb, so I assume the slipping rather than tipping would...

Thank you in advance. But is there a way to do it in spherical coordinate? And for question 2, I did the command int(function,[x=..,y..,z..]) and it returns error Error, (in assuming) when calling '`property/ConvertProperty`'. Received: 'real is an invalid property' but I can evaluate it...

HELP! Setting up triple integral in spherical coordinate Homework Statement http://img517.imageshack.us/img517/9139/83291277.jpg Homework Equations I set up the bound for this problem as following: r=0..2/cos(phi), phi=pi/2..3pi/4, theta=0..2pi, but maple always return an error in...