Recent content by phys-lexic

I have been out of unversity statistics and biometry for a few years do date. I am working in a clical research facility and we are comparing two methods of microbial identification and am now working on the results / charts / statistics. Forgive me for my ignorance, but I am forgetting which...

Aah.. I tried it out a few times and ended up going in circles. Thankyou anyways everyone, now I know why this question is "way harder than the exam would be."

I understand algebraic means won't help, which is why I'm posting this question. Trig-substitution is what I was thinking, but is that applicable when not integrating? (We were only introduced to trig-substitutions with integrals, for obvious reasons)

Thankyou, the trig-substitution worked and I set up the correct proof. If you wouldn't mind, we were assigned homework for an exam review. I finished the regular problems, but he gave us three "critical thinking" problems that would be way harder than the exam. I can do them all, but one is...

really complicated "solve for x" problem.. please help.. Homework Statement [This is the final step in a "critical thinking" problem assigned as extra practice/intense application] Find the value of x, for the given equation, when f(x) = \frac{49}{6}\pi f(x) =...

can't figure out how to remove it..

this helps me when writing the integral... hey vex... if the drawn washer/disk is vertical (goes up and down) integrate over x (use dx), if it is horizontal (goes left and right) integrate over y (use dy)

In doing math I try not to memorize shortcuts/simplifications, but instead understand what's happening. When studying integrals, my professor gave out a few "simplifications" for us to use on problems; most of which I have been able to figure out, except one. I just cannot seem to figure out the...

sorry

when using lorentz factor in time dilation and length contraction... are those phenomenon only considered when the velocity is comparable to the speed of light or does it happen all the time and extremely negligeable in all cases other than when v~c? thanks.

sweet... thanks

I know the concept behind the shifts, i just am not sure what they mean by an increase/decrease in wavelength... do they mean from the source to the observed or from the observed to the source... which is why i gave the example from a source it is 630nm (red) to being observed as 530nm (green)...

i did that... would anyone mind checking my answer? v=[(c)(f0/fs)2-c] / [(f0/fs)2+1] and my final answer for v was 5.14 x 107 m/s, towards the source because the wavelength shifts from the source, 630nm, to that observed, 530nm, a blue shift...?

i just have the two mixed up, and need an example to set it straight... lets say you're source is a red light (hight wavelength, low frequency) to green light (lower wavelenght, higher frequency)... that would be a blue shift? redshift = wavelength (H->L) frequency (L->H)...

"Basic" problem regarding doppler effect of light (E/M waves) 1. At what speed would one have to move at to see a red light as green. Presume red light wavelength = 630nm and green light wavelength = 530nm. 2. f0=fs√([1+v/c]/[1-v/c]) >f0 = observed frequency >fs = source frequency >v...