Recent content by tfhub

Hi, is there any general formula to find out the final velocity w, happened by a boost in x direction forst and then to y direction? I could find the boost matrices for both and I know it's not purely another boost, rather a boost and a rotation, but I am really confused which formula to use...

Homework Statement I have been given a functional $$S[x(t)]= \int_0^T \Big[ \Big(\frac {dx(t)}{dt}\Big)^{2} + x^{2}(t)\Big] dt$$ I need a curve satisfying x(o)=0 and x(T)=1, which makes S[x(t)] an extremum Homework Equations Now I know about action being $$S[x(t)]= \int_t^{t'} L(\dot x, x)...

the question statement is2. In a course, a student's final exam is weighted twice as heavily as his midterm exam. If a student receives a score of 84 on his final exam , 90 on his midterm, what is the average for his courses? now i am pretty confused should I have to know the total marks for...

Hi , I finished my undergrad major in physics this fall. I wish to apply to grad school for next fall, so I need some book review books on physics, I n my university we followed Griffith's intro to QM as textbook, I solved almost all the problems there upto chapt 7, but this seemed a more...

Hi. I completed my undergrad major in physics and want to go to grad school for astrophysics. I want to have a year revision of the mathematics needed for astrophysics. What type of math is needed to excel to be a successful astrophysicist. I have some lacking in integration . What others are...

Homework Statement -h^2/2m (sqrt(2b/pi)) e^(-bx^2) d^2/dx^2 (e^(-bx^2)) dx from - to + infinity Homework Equations I tried differentiating e^(-bx^2) twice and it came up weird , I positioned the values and finally cam up with (-2b sqrt(pi/2b)...is there any other way to do it ? The...

nah

well I am pretty good with classical mechanics, I think everybody is, but I suck at quantum mechanics, my peers are not very intuitive though

well I know my scores are not helping me anyway, and I have not finished my graduation yet, so I want easily wait one more year to retake. But its a masters program, so do you think my chances are really null?

Hi, I can do it well when I approach the same problem next time, I just have problem with the first time, like when i face a problem , I just don't know how to start it, as soon I see the solution I can do it. How can I know how to initialize the solving ?

Hi, I have some basic problem with solving physics problems. I cannot solve the quantum or statistical problems without help or by myself. sometimes the problem is that I don't even get what to start with. I am in my undergrad last year now. do you have any suggestion how to improve my problem...

hi, i have been applying to ms in physics at umass dartmouth for fall-15, I have 85% cgpa in undergrad and I have my paper and thesis, but my first physics gre is out today and I got only 580(25%)! I can't believe I scored this bad. my toefl and genera gre are to be held soon. I hope optimum...