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Cry for help |
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| Unanswered Cries for Help! Total So Far: 14 | | 0 | Click here to jump to the problem! | GR8677 #78
2007-10-21 21:28:08 | I'm not really seeing why the tangential velocity of the two masses together is equal to the sum of their original linear velocities. Why can they be added this way? |
| 1 | Click here to jump to the problem! | GR8677 #66
2007-01-28 11:23:56 | I think I'm not understanding something here...
In part (B) you say "the energy of Jupiter is greater than that of the spaceship"
But in part (C) you state that while the energy of Jupiter falls between Vmin and 0, the total energy of the spacecraft must be greater than 0, implying the spacecraft has more energy than Jupiter.
Both can't be true - intuition tells me Jupiter has more energy, but I'm unsure how that leads to the correct answer. |
| 3 | Click here to jump to the problem! | GR8677 #7
2006-11-01 10:44:16 | Can you explain in greater detail? I can solve it, but I run into some messy algebra with quadratic equations. Can you explain how you so elegantly obtained these values? |
| 4 | Click here to jump to the problem! | GR8677 #41
2006-10-29 21:40:11 | Can anyone direct me to a good explanation of the full spetroscopic notation and how it relates to the selection rules?
More specifically, what part of this notation denotes m, the magnetic quantum number? |
| 5 | Click here to jump to the problem! | GR8677 #77
2006-10-28 16:13:15 | Is it really ok to generalize A^2psi=A(A+1)psi and B^2psi=B(B+1)psi to (A+B)^2psi=(A+B)(A+B+1)psi?
Maybe I'm just confused, but it doesn't seem very obvious why that works. |
| 6 | Click here to jump to the problem! | GR8677 #34
2006-10-27 15:15:32 | hey
i cant get enough practice problems for quant. i have got schaum seeries but it has only derivations any one has any material plz i want it |
| 7 | Click here to jump to the problem! | GR8677 #100
2006-10-27 14:07:24 | hey watz up to begin iam a BE undergrad shifting to engineering physics.
any ways i just wanna know from where do i study error analysis. if any one has the notes on the comp plz mail them to me.
also if any one has practice problems (except for the four papers and two small other ones) specially for phy gre plz i want the soft copy.
bye, best of luck to everyone |
| 8 | Click here to jump to the problem! | GR8677 #64
2006-10-19 13:49:09 | What's this about a capacitor and an inductor? Problem 64 from 86 exams says "An alternating current electrical generator has a fixed internal impedance..." ? |
| 10 | Click here to jump to the problem! | GR8677 #57
2006-03-31 22:40:22 | I don't understand. The problems gives the angle between the first minimum and the central max. Doesn't that correspond to m=1/2 which leads to d = 5 x 10^-5 which is B? |
| 11 | Click here to jump to the problem! | GR8677 #67
2006-03-18 20:31:05 | jakevdp, thank you for posting your alternate solution. It seems that that is the shortest and the one ETLS wants you to think of.
Yosun, when you have zeta*(Dzeta/Dtemperature) how come that in the remaining exponential terms (second equation) do not have a factor of 2 in their powers?
I think there should be exp(-2 epsilon/kT) and exp(-6 epsilon/kY |
| 12 | Click here to jump to the problem! | GR8677 #47
2005-11-10 21:33:24 | Why is C the more correct answer than A? Your last comment in the introduction makes this seem confusing. |
| 13 | Click here to jump to the problem! | GR8677 #92
2005-11-08 21:14:27 | If there is no selection rule for spin, then there would be no for j too. Recall that j=l+s. I was wondering this is because the photon emission obeys the conservation of spin momentum so that delta s is zero. Can anybody tell your opinion? Thanks. |
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