Recent content by bckcookie

I got it, thanks so much!

I don't know what is the value of changing L and how to calculate it, please advise me!

I think about many times for few days, but I still can't find out the correct answer! Maybe my steps are somethings wrong, please advise me! Thanks! A copper rod, 0.4m long and 4.0mm in diameter, has a resistance of 550μΩ at 20℃. Calculate the resistivity of copper at that temperature. If the...

You are right! I misunderstood my calculation before. I corrected it and submit it to my tutor! Thanks a lot!

My following approach! Thanks a lot! a) i) d/v =t, where d=15, v=c, so, = 15/c= 5x10^-8s ii) d/v =t, where d=15, v=c, so, = -15/c= -5x10^-8s iii) d/v =t, where d=30, v=c, so, = 30/c= 10^-7s iv) d/v =t, where d=30, v=c, so, = -30/c= -10^-7s b) The times according to Tom for the above...

Thanks so much! You are right! Done!

I can confirm that the time of (i) is faster than (ii), but i have no idea how to calculate it, please advise!

Please advise me the updated solution as follows; a) You are right! i) d/v =t, where d=15, v=c, so, = 15/c= 5x10^-8s ii) d/v =t, where d=15, v=c, so, = 15/c= 5x10^-8s iii) d/v =t, where d=30, v=c, so, = 30/c= 10^-7s iv) d/v =t, where d=30, v=c, so, = 30/c= 10^-7s b) The times...

Problem in Lorentz transformation(Urgent!) 1. Homework Statement Please see the attached file and advise me my solution is right or not! Thanks! 2. Homework Equations ~ d/t = v ~ Lorentz transformation : x'=(x-Vt)/(√(1-(V^2)/c^2), t' = [t-(V^2)/(c^2)]/√1-(V^2)/c^2), 3. The...

Please advise!

Please advise!

you are right! Thanks for your hints!

Homework Statement Please let me know whether it's wrong for my attached solution. Homework Equations i = (d∅/dt)/R The Attempt at a Solution In part (d), does it calculate wrong?? In part (e), where has the dissipated energy? is it for heat energy?? Thanks!

Homework Statement Please let me know whether it's wrong for my attached solution. Homework Equations magnetic flux = BAcosθ The Attempt at a Solution I don't know how to calculate the part (c) as attached file, please advise!

Homework Statement As attached file! Please advise me my solution is right or not! Thanks a lot! Homework Equations F=qvB - (1) R=mv/eB d/t = v length of arc = 2pi(R) sinθ=a/c The Attempt at a Solution a) the magnetic force, F = qvb =1.6x10^-19 x 10^7 x 0.03N = 4.8x10^-14N (does it need to...