Recent content by Parbat

i mean,how can we say "time" is a dimension? & dimension means something that is required to explain any object,is that true?

What does "time" really mean? What does "time" really mean? i really don't know that.

that's there: 0.5mv^2=Kfriction*1.70 u see that?

how can magnetic & electric field become zero & again increase?how does that happen?

we represent electromagnetic waves by sinosoidal curves. magnitude of what changes sinosoidally? or what does that represent?

ya.Everything's right. but some scalars require direction also for complete information.For eg:current produces magnetic field but it's direction can only be determined if u know the direction of current.

u r right.the energy in the bullet is used to take the block & the bullet 1.70 m ahead. so u can equate the kinetic energy of bullet & work done by "bullet & block" to travel 1.70 m against friction. use: Kfriction=coefficient of friction * weight of (block+bullet) & 0.5...

Has Neil Turok told somethin about how the "universes" which collide to form new universe exists? isn't he missin somethin again?

thank u for that suggestion.

I have become very alone in PF.i need some friends.would anybody like to be my friend? please be my friend.

i was talking about light entering at an angle.[for refraction]

if absorbing & re-emitting is the phenomenon,why isn't it possible without the direction change?(i mean refraction)

Hey guys,please tell me what u think about it?

the wavelength increase is not actual,it just seems so.And this is the Doppler's effect.I would like u to study Doppler's effect.:smile:

thank u for ur reply.