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  1. W

    Freshman in quantum mechanics

    Well, my math advisor said that in his first year of graduate school at Harvard he took a class which had a freshman and a sophomore as the graders for the course. He also said it was somewhat disheartening. I also personally know of a physics undergraduate who took graduate level physics...
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    Moment of inertia of a hollow sphere

    Is it a hollow sphere(a spherical shell) or a solid sphere? Because the answer that you say is supposed to be correct is for a solid sphere, unless I've made some error. They're both pretty similar and I think you're going to get into trouble if you don't use curvilinear coordinates, at least it...
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    Calculus & velocity

    Is the question resolve the x and y components of omega? If so then your answer is not correct, your x component for omega is close, and where did v come from? First of all do you know how to take a determinant of a 3x3 matrix? If you do then the standard way to solve your problem without...
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    GRE Subject Scores

    Perhaps the point of the problem was to factor the difference of two squares, a solution that seems to me should be obvious to anyone proficient in mathematics i.e. perhaps it's testing the fundamentals.
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    Programs After obtaining a degree in math

    It depends on two things really, one is the manner in which you ask the question and the other is the depth of the question. There are many things about elementary topics that you'd never be taught in any class that was required for your undergrad math degree. Math has existed for a long time...
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    A tank of compressed air

    Check your units, can you really use atmospheres with that equation?
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    Programs Whats your major GPA .Be honest

    Well when you learn to read correctly I'll respond more courteously to your reply. Did you read that, ok re-read it; let sink in it's ok if it takes a while. Let me put it in mathematical notation, which might make it clearer (well to anyone who is mathematically inclined, and for some...
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    Programs Whats your major GPA .Be honest

    Actually I'd like to point out something that is quite wrong with your poll. It doesn't include the entire band from 0-4.0 for gpa scores. Where would a score of 2.35 or 3.89 fall? I assume that you meant( as an example I’ll use your second choice) that 2.0-2.3 should actually be 2.0-2.4 meaning...
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    Physics Careers in Quantum Physics

    I believe the field you are really looking for isn't physics or quantum physics, it sounds more like philosophy and a particular branch of it:" [Broken] .
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    Can anyone tell me anything about the INFN-DOE internship?

    Btw, the above isn't proper Italian. Italy should be a great place to stay in but I have no info on the program.
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    Who will be PFs first millionaire

    You forgot an e at the end of millionaire.
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    How hard is each?

    At a certain level any field of study becomes challenging, the trick is to find what you like and what you're good at. However, how in the world am I to relate to you how hard certain majors are compared to each other? This is highly subjective....people think in different ways, and, therefore...
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    Programs PhD in Math

    I believe IAS stands for the Institue for Advanced Study, at Princeton.
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    Bullet question

    Let's take a bullet traveling at a 1000 m/s and weighing about 100g, I don't know much about bullets but I would guess this would be pretty fast. Let's also assume there's no friction and the bullet gets stuck in a man weighing about 70kg. Then the man and bullet after the collision will have a...
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    Which classes should I enroll in?

    You should ask your college advisor. However, I personally like to take what is required first and so after finishing all that is required I can focus on the courses I truly like.
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    I love baklava!

    It's pretty good.
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    Would a 3.6ish GPA average (maybe it will be higher when i end 12th [Broken] self-reported stats for early decision...that forum has almost any major U.S. college you can think of....around the 3rd page start the deferrals(meaning you didn't get accepted and you get another review of your...
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    One last river problem that has me confused

    Here's a hint he's crossing the river not going upstream and downstream.
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    Ball rolling down a ramp question again (different than traditional ones)

    First question, how did you change the "length of the ramp" if both height and angle of elevation were constant? Also how did you take in account friction? In my opinion trying to answer these questions should give you some insight on why your results don't show the pattern you were looking for.
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    Mass and time

    Right, I don't know why I missed that. Edit: I think I've figured it out.... posted "Today, 12:13 AM"
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    Mass and time

    They wouldn't be subject to the same net force, the frictional force would be lesser on the lighter object so it would accelerate towards the end of table faster and start falling at a different(earlier) time then the heavier object. In answer to your question, in that scenario, yes.
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    Integrate [2x sin (x^2) dx]

    use the subsititution u= x^2
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    Another integration

    Here is the solution i was hinting at, without knowing the derivative of inverse tangent... \int \frac{1}{x^2+4} dx \ u = x/2 \ du =1/2 dx 1/2 \int \frac{1}{u^2+1} du \ u =\tan(\theta) \ du = \sec^2(\theta) d\theta = 1/2 \int \frac{\sec^2(\theta)}{\tan^2(\theta) +1} d\theta = 1/2 \int...
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    Another integration

    I'll assume you can do the first step, then use the trig substitution x = tan(θ). Remember after you have your answer you have to get it back in terms of x, your answer will be in terms of theta. Edit: forgot a comma and a then, it might make it confusing.
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    Another integration

    I think he/she is asking whether you need to know inverse trig derivatives/integrals to do this problem. You don't need to know the derivative of inverse trigonometric functions to do this problem, however you need to know about trig substitutions, if you can do trig substitutions then this...
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    Age Limit

    No, there is no age limit, and it would be illegal to have one. Think about it this way, assuming you are qualified, why would any university refuse money?
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    Test Anxiety

    I don't know what works for you, but what worked for me sometimes, i had a similar problem a while back, was not studying right before the exam, i mean immediately before, all it does is it makes you doubt what you learned, trust what you studied the night before. Other than that, it will just...
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    Extremely discouraged by this one guy

    College shouldn't be a competition, people are supposed to try their best, and those that excel in their fields get rewarded for that, and not rewarded for being smarter or doing better than someone else. That being said, this is not usually the situation in many people's minds, and in some...
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    I am failing my 1st year physics

    All I have to say is to try hard and hang in there, it will pay off, maybe not immediately but eventually you will see the fruits of your labor. I was thinking of the non slavic language of Albanian, the word itself may be borrowed from slavic, and in albanian budalla = stupid or goofy.
  30. W

    Work Question

    The answer is .5115 MJ the equation in symbols should look something like this F_g_r_a_v_i_t_y * d + F_f_r_i_c_t_i_o_n * d + F_a_c_c *d = .5115MJ where F_a_c_c is the force exerted by the machinery to accelerate the elevator.