The equation you quoted is only used for particles that have rest mass.And anything with rest mass CANNOT travel at the speed of light.As you've noticed, putting v=c yields infinity so you'll need infinite energy to accelerate something with rest mass to the speed of light.For a photon, the...
1) Photons reaching your eyes.Photon IS light!
2) It has no ress mass, but it does have momentum! Energy of photon=its momentum x c
3) That is the 'apparent' speed barrier of the universe.Nothing can travel faster.If light could travel faster, the universe would have 'that' speed as the...
I always thought GPE was absolute since GPE is a scalar...I never really thought about it that way o.O silly me :P
Thanks a lot for the replies guys :D
Homework Statement
This is elementary level stuff and I am pretty much past this, and yet I can't seem to find a suitable way of explaining this.I was thinking about Potential Energy of a particle of mass m falling freely under gravity(ignoring air resistance, again, beginner stuff :P) from...
Let the total time be t seconds.So the time before falling half the distance is (t-1.7) seconds.
Before falling half the distance:Find the velocity of the particle at T=(t-1.7)seconds.The velocity at t seconds is?(hint:use v=u+at)
After falling half the distance, the velocity you calculated...
Luminosity, which is a measure of the total output power of a star(unit: Watts) can be used to find the temperature of the surrounding stars. The luminosity of a star is proportional to its radius and temperature raised to the power 4.That is, L=σ x 4πr2x T4
Wien's law, on the other hand is a...
I am self-taught.Others have tutors, so they don't face much problems.
The book has examples, actually 'example', on center of mass toppling problems but the exercises include problems that are tougher, like, 'an extra mass M is added to point C to help the lamina stay in equilibrium.Find the...
I am studying for the mechanics modules of A level mathematics under EdExcel.So far the books seemingly published to support the specifications aren't doing a very good job.The examples in the books don't tell the students how to solve problems in the exercises, which is a sheer let down.I want...
It would be better if you could tell me the rules? Because i need help immediately.This types of math are completely foreign to me since even the books don't say how we should approach such problems :frown:
Sorry if i sound impatient :redface:
I tried outlining the forces and resolving...
[Mentor's note: this was originally posted in a non-homework forum and then moved here, so it doesn't use the standard homework forums template.]
I am studying the edexcel A level M2 mathematics module and came across this question that i don't know how to do.Even the book doesn't have any...