Recent content by Erubus

It's a general physics course. Thanks for the replies, I will keep working on it.

I'm sorry, can you explain a bit further? I used the e-m wave equation because that is the topic of the section in which this question was asked. How would I use the total magnetic field to find the power?

Homework Statement A long hollow nonconducting cylinder (radius R= 0.060 m, length L= 0.70 m) carries a uniform charge per unit area of σ= 4.0 C/m^2 on its surface. Beginning from rest, an externally applied torque causes the cylinder to rotate at constant acceleration α= 40 rad/s^2 about the...

Got it, thanks.

Thanks, I got it now.

\phi = (2pi/(540x10^-9) * 3600x10^-9 = 41.88 answer is 120°

Homework Statement Light with wavelength 540 nm is split into two beams that travel along two paths. The difference between the path lengths is 3600 nm. What is the effective phase difference when the light recombines? Homework Equations \phi = (2pi/λ)*ΔL The Attempt at a Solution...

Thank you for the link. If I read it correctly, flux = .25*(N/V)*√(8kT/(\pim) however, the density in the problem is given in kg/m^3 while the equation calls for the density based on the number of molecules, which is not given. It's probably an algebra problem now, but I'm also unsure with...

Homework Statement What is the molecular flux of argon gas, molar mass 18 g/mol, with density 0.73 kg/m3 and temperature 300 K? Answer: 3.6×10^27 collisions/m^2s Homework Equations I actually have no idea The Attempt at a Solution I can't find any reference to molecular flux in my...

I figured it out, thanks!

Homework Statement A sample of oxygen gas with molar mass 32 g/mol contains 5.0 moles and is at a temperature of 500 K. How many moles of the gas have speeds between 375 m/s and 380 m/s? Homework Equations Maxwell Boltzmann Distribution: f(v) = 4\pi[\frac{M}{2pi RT}]^(3/2) * v^2 *...

Got it, thanks.

Homework Statement The radius of curvature of both sides of a converging lens is 18 cm. One side of the lens is coated with silver so that the inner surface is reflective. When light is incident on the uncoated side it passes through the lens, reflects off the silver coating, and passes back...

Finally got it, thanks so much.

The method makes sense, but I am still not getting the right answer. if y = a[sinθ - other term] then dy/dθ = a[cosθ - (derivative of other term w/ sines and cosines)] and I assume the incident angle would be 90° because it would be a straight line through the cube. I plug in 90° in...