Recent content by superkraken

Homework Statement how does the length of a rod change when it moves fast? Homework EquationsThe Attempt at a Solution

Homework Statement when we calculate the electric field due to a plane sheet or the magnetic field due to a wire,are we calculating it at a single point or the whole field due to the total wire? Homework EquationsThe Attempt at a Solution

yes.i found the answer another way but can't it be solved like this?using velocity

okay is it 50m

okay here is my attempt first at t=5 s we get v=u+at2 as u=0 v=at=5a then for time 5 to 10 seconds s=ut+1/2at2 so 150=5a x 10+1/2a x 100 150=50a+50a=100a giving a=150/100=1.5 so for 1st 5 seconds s=1/2 x 1.5 x 25=18.5

what is it ?the final answer i need to find out where i made mymistake too

this is the first time I am learning about photons and i have asmall doubt. if photons are massless then how come light dosent escape from black holes. or if they do have mass the by the eqn m=m0/(1-V2/c2)then theyll have infinite mass and turning on a torch may be like getting hit by a bullet...

is the answer 18.75?if it is the find v at the end of 5 seconds.and substitute in the eqn s=ut+1/2at2 for 5th second to 10th

for 3.i think it will rise because the force by water is ρ(of water) x volume x g(acc. due to gravity).if ρ is less than ρ(water)

ok but what do i integrate from where to where?if i take a small area of width dx and at a distance dr from tthe center .the answer is pretty confusing

Homework Statement two infinitely large plates are at a distance d from each other .they carry a unifor surface charge of densities X and -X.the plates have round coaxial holes of radius R.with d<<R.find the electric field through the axis of the holes(taking them as circles) as a function of...

i am javid and ineed a little help in some problems like the problems in ie irodovs book