Recent content by aznshark4

Uhh, I don't think so. The refractive index depends on the material the medium is made of, and that's it. What I was asking here was an interference question. When the medium is at a certain thickness, the light reflected from one end of the medium interferes with that from the other end to...

it's 3R/2 but i still don't know R

Homework Statement there is a 110-V battery serving as a voltage source, and the circuit goes like: from the battery, there is a 100-Watt bulb connected, then the circuit branches into two parallel wires each with 100-Watt bulbs, then the wires rejoin and lead back to the battery, find...

yeah, but how do you come up with the correct wavelength?

Homework Statement The table lists the range of wavelengths in vacuum corresponding to a given color. If one looks through a film which has a refractive index of 1.333 and thickness of 340 nm (nanometers), which color will be 100% transmitted through the film? Table (Color/Wavelength)...

my calculus teacher said save the easiest part of the integral that you can still integrate for "dv" and use the rest for the "u". my textbook has more about that, and I'll get back to you later on it.

Homework Statement \int\frac{xe^{2x}}{(2x+1)^2}dx where "e" is the natural number Homework Equations (none) The Attempt at a Solution I tried many ways to solve this problem, but to no avail. the hint on the book said to use substitution and make u=xe^{2x} and du=2xe^{2x}+e^{2x}dx...

I don't think I understand. When you take the derivative of tan x don't you always get sec2 x?

yes, thanks for the confirmation! Yet, I also forgot to note this: when I convert the 30 (supposedly degrees, because I was working in degrees) to radians, I got .5236 which rounds to approximately 1/2 radians. However, since I got the answer in "radians per hour", I wasn't supposed to...

Homework Statement "An airplane flies at an altitude of 5 miles toward a point directly over an observer. The speed of the plane is 600 miles per hour. Find the rate at which the angle of elevation \theta is changing when the angle is 30\circ" variables: x = ground distance of plane from the...

we are comparing a whole group, not "the probability of a random student getting x number of A's in a row is y". how do you even know what to reject or not when you don't even have the data?

the first one seems to be the correct test. for the second, if you're comparing responses for two different medications, you should use a 2-sample z or t test, if you're comparing mean responses. if you're comparing the variability of the responses (standard deviations), then you should use...

unless one row total or column total is exactly 0, then the expected cannot be 0. is the expected calculated right? expected=[row total]x[column total]/[table total] if one of the totals indeed 0, then the category containing that is completely invalid!

that is not good statistical reasoning. we're not trying to find the probablitiy of getting straight A's for an individual. we need an actual test for significance. promethius is right, we need some more info: First, we need the complete set of numerical grades for each student (this can be...