Recent content by physnoob

Hmm, there is a little different with the answer i got and the answer in the book. I have attached a pdf file with my work and the answer in the book, could you guys check and see what i did wrong? Thanks again!

Got it! Thank you so much guys!:-p

Okay, I understand how to get the 2 lines now. But I am still a little bit confuse over the semicircle. How does lambda*pi*R relates to equation for voltage of a point charge? Thanks for the help :)

Homework Statement The wire in the following figure has linear charge density \lambda. What is the electric potential at the center of the semicircle? Homework Equations The Attempt at a Solution I can see a lot of integration going on here, but i am having trouble the setup the...

thanks :)

Homework Statement Resolve the following into partial fractions. Homework Equations The Attempt at a Solution Is my first step correct? A/x + B/x^{2} + C/(x+1) + D/(x+1)^{2} Thanks in advance!

o boy, that was embarrassing lol just want to make sure, is the answer cos^{-1}(e^{-x}) + C?

hmm, can i get a little more hint? if i do a u sub. of u = e^{-x}, how do i get rid of e^{-2x}? I have tried do a u sub. of u = \sqrt{1-e^{-2x}}, but i ended up getting the \int du/e^{-x}, which i don't know how to proceed after this. What am i doing wrong?

Homework Statement \int dx/(e^{x}\sqrt{1-e^{-2x}}) Homework Equations The Attempt at a Solution I have absolutely no idea of how to start the problem, any help is greatly appreciated! thanks!

Just did some plug and chuck with the equation f = v/L, substituted v = sqrt(T/u), T=mg, u = m/L, m cancels out, L = 2.45x10^-4, does this sound right?

Homework Statement When mass M is tied to the bottom of a long, thin wire suspended from the ceiling, the wire's second-harmonic frequency is 200 Hz. Adding an additional 1kg to the hanging mass increases the second-harmonic frequency to 245 Hz. What is M? f_{2} = 200hz, m = M f_{2} = 245hz...

I don't think that's the case. If i turn the corner by following an arc, i would have to use a series of rocket burns, but the problem is asking to do it with a single rocket burn, and i can use small thrusters to change the angle before i apply the main rocket burn, but I'm not sure though...

bump, please help!

Homework Statement Driving a spaceship isn't as easy as it looks in the movies. Imagine you're a physics student in the 31st century. You live in a remote space colony where the gravitational force from any stars or planets is negligible. You're on your way home from school, coasting along in...

I hope it's okay to bump this 2 yrs old thread up, because i have the same problem :P Could someone please explain to me why the acceleration of m2 is half of m1?