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 0 Click here to jump to the problem! NoPhysicist42017-03-23 14:53:40 Do not mix infinite square well and harmonic potential as I did. In the first case, the numbering starts from 1, while the latter employs 0 as the initial state. Therefore the correct answer is E.Click here to jump to the problem!
 4 Click here to jump to the problem! NoPhysicist32017-03-23 12:37:05 The distance considered in $mgh$ is the center of mass, therefore in this problem $\\delta h$ is 5 meters. Thus, the difference in energy is $mg\\delta h$ $=$ $1000$ $J$.Click here to jump to the problem!
 5 Click here to jump to the problem! NoPhysicist32017-03-23 12:31:21 The words \"certain region\" are VERY confusing. However, when choosing between B and E, one should keep in mind that it is unlikely for ETS to consider a correct answer containing ultimate statements. Therefore B is the only correct.Click here to jump to the problem!
 10 Click here to jump to the problem! NoPhysicist32017-03-23 10:13:45 Notice that the total resistance of the smallest circuit is 20 ohms. Therefore total resistance of the right vertical bar is 50 ohms, which is the same as R2. Since the current distributes between R2 end effective R (combined from R3, R4, R5) equally, we imply that the maximum current is at the R1, and therefore the maximum power is.Click here to jump to the problem!
 14 Click here to jump to the problem! NoPhysicist32017-03-23 08:42:15 Taking limits in this task is a perfect way to solve the problem (and I think it is what GRE wants to test here), however it could be complicated to guess the factor of 2 between C and D.\r\nMore explicit reasoning is the following: since we have two triangle wedges, the big mass M would be distributed between both, therefore the maximum mass M would be twice of that in answer C, therefore leaving us with the correct D.\r\nClick here to jump to the problem!