Recent content by crystalplane

hey guys, <n|(a-+a+)^4|n> = 5n2+5n+3 I am wondering if some one can show me why left and right side are equal 　　　　Thanks in advance

the graph is attached now...

Homework Statement a)What is the minimum refractive index of the prism in order for the light to reflect? b) What is wrong with this ray path for a reflecting prism? Homework Equations nisin(theta 1)= ntsin(theta 2) The Attempt at a Solution for part a, nt is 1, theta 2 is 90...

Homework Statement a particle is on a trajectory defined by the parametric equations x(t)= 2t^2,y(t)= t^2-4t, z(t)= 3t-5, where t is the time.Find the components of its velocity and acceleration at time =1, in the direcion i-3j+2k. Homework Equations what i thought is r(t)=x(t) i...

Homework Statement A thin, circular plate assumed to lie on the xy-plane is rotating about its center, located at (0, 0), with angular speed ω. (ω > 0 means that the plate is rotating in the counterclockwise direction.) Show that the velocity field of of this plate is given by v(x, y) =...

For the IVP problem, you should find I(X) you may get I(x)=e^x dx then you multiply I(X) on both sides and you can solve the problem i guess

i get the exactly same question... i don't know how to solve it either... have you already got the answer yet? if you have, could you give me some hint? please email me jaywang19880830@gmail.com

if i know a meter is observed at an altitude of 6km, to be traveling with an initial velocity of 20 km/s and the decelerating at a rate dv/dt=0.2km/s^2, which formula i should use to get the length of the semimajor axis of the meteor'orbit?

i got a atronphysics question that i have a hard time to solve it: In the most massive stars, nuclear fusion continues until iron-56 is formed in the core. consider the net process, which is to take 56 hydrogen atoms and turn them into one iron atom. a, how much enegry is released per atom...

Homework Statement the image below shows the Moonat perigee and apogee. Measure the diameters for the two, and determine the ratio between perigee and apogee idstance.Based on your result, what is the eccentricity of the Moon'orbit? Compare your value with the Moon' s mean orbital...