Recent content by daisyi

The packet doesn't explain this concept very well, and the book doesn't seem to explain it at all. A glass surface (n = 1.5) is coated with a film with an index of refraction n=1.3. If light of frequency 6x10^14 cps is incident almost normally on the film, find the minimum thickness that...

thanks, i got it :)

right, so y=9.12*10^-5m, d = 2m and L = 3*10^-2m.

Almost done guys :) If the first order bright lines formed by two slits at a distance of 2 meters are 3 cm apart, find the wavelength of the light if the slit separation is 9.12x10^-3 cm. So, to find the wavelength, this is what I did. wavelength = 9.12 * 10^-5m * (2m/(3*10^-2m)) =...

I can't figure out how to find the mass of the clothesline, even though given the density, because the radius or crossectional area is not given. Any input on this would be appreciated. A clothesline of length 10m is stretched between a house and a tree. The clothesline is under a tension of...

thanks for both of your help. The problem is that I already tried that (sorry I didn't put that there earlier, I was very frustrated at that point). But I am still coming up with the wrong answer. I keep getting 2.27 seconds... so the mass = 6*32.2 = 193.2 and then to find u: 193.2/80 = 2.42...

A nylon rope of length 80 ft. is under a tension of 3000 lb. The total weight of this rope is 6 lb. If a wave pulse starts at one end of this rope, how long does it take to reach the other end?

i'm not sure if this helps, but I am a computer science major, and java is the main language that we are learning with C++ as a very tight second. The more languages you learn the better, but I highly recommend that you learn either or both of these because it seems that is the way that things...

One mole of an ideal gas in a cylinder fitted with a piston is made to expand slowly (reversible) from an initial volume of 1x10^3 cm3 to a final volume of 2x10^3 cm3. The cylinder is in contact with a heat reservoir so that, throughout the expansion process, the gas is held at a constant...

The boiler of a steam engine produces steam at a temperature of 500C. The engine exhausts its waste heat into the atmosphere where the temperature is 20C. Assuming that the efficiency of an engine can never be greater than that of a Carnot engine, what is the limiting efficiency of this engine...

I double checked and it still looks right to me. This is how I did it. V = nRT/P so, when the gas is heated to 500k with constant volume, the volume is: V1 = (3/10)(8.314)(500)/1.5x10^5 = 8.314x10^-3 and then when the pressure is compressed back to 5x10^5: V2=...

okay, well its been a little while since I've done logs, but I'm pretty sure this is how it goes... remember the properties of logarithms: log(x)^y = ylogx is one of them, i remember, and I'm sure there's one regarding multiplication, but its not coming ot me at the moment. good luck

it just says find the net work. I stated the problem exactly as it is written. Grr...this one is driving me nuts!

Okay, I've been working on this for a while: Three-tenths mole of an ideal gas at 400K is expanded isothermally from a pressure of 5x10^5 N/m^2 to 1.5x10^5N/m^2. If the gas is then heated to 500K at constant volume and then is compressed isothermally back to 5x10^5 N/m^2, and then...

thanks, i see now where I wasn't understanding. Thanks so much! :smile: