Recent content by erisedk

Thank you! Got it.

Yes

Homework Statement Why is the following set of electric and magnetic fields invalid? ##E(x, y, z, t)= E_0 \sin{(kz-wt)} \hat{i}## ##B(x, y, z, t) = B_0 \sin{(kz+wt)} \hat{j}##Homework EquationsThe Attempt at a Solution So, I understand that either both should have (kz-wt) or both should have...

Homework Statement This is why we build them as colliders now: Some years ago Fermilab used to extract its high energy proton beam for use by "fixed target" experiments situated at the ends of external beamlines a mile north of the Tevatron ring. The energy available for the production of...

Homework Statement <Most of this is irrelevant, the relevant parts are in italics> The Greisen-Zatsepin-Kuzmin (GZK) upper limit on cosmic ray energies The contemporary universe is filled with low energy photons left over from the time when the early universe cooled sufficiently for the...

Part (b): ## v = u + (v_0 - u)e^{-\frac{\sigma t}{m_0}} ##

After correcting part (c) for the constant of integration, I get ## v = \dfrac{m_0v_0 + u\sigma t}{m_0 + \sigma t} ##

Actually, for (c) I used the equation for rocket propulsion that's given in my homework. That's why I wrote equation 1.

Ignore

Wait, I think I forgot ##v_0## in part (b) as well, and took all my limits of integration from 0 to ##v##

Final answer for (b): ## v = u(1-e^{-\frac{\sigma t}{m_0}}) ## I'm trying to correct (c)

Oh, ok, I get it. So here's what it should be then: Let speed of the car at a given instant be v. Consider some rain falling into the car of mass dm. In the frame of the car, speed of the rain is u-v. Change in momentum of rain = -dm (u-v) Change in momentum of car = dm (u-v) ##\frac{dp}{dt} =...

None of the pictures showed up for some reason. http://proquest.safaribooksonline.com/book/physics/9781139637589/firstchapter#X2ludGVybmFsX0h0bWxWaWV3P3htbGlkPTk3ODExMzk2Mzc1ODklMkZzZWM1XzExX2h0bWwmcXVlcnk9 Does this link work? If you scroll down the page, you'll find answers. I'm not sure if...

That's what I did initially. Then someone pointed out a very similar problem from a textbook (Morin) and said that what I did was wrong. Here's the problem and the solution as published in Morin: 5.15.Propelling a car ** For some odd reason, you decide to throw baseballs at a car of mass Mthat...

Is (c) correct?