Subject: Re: ?
From: Phill
Date: October 29, 19102 at 11:46:50

In Reply to: ? posted by Yoggie on October 20, 19102 at 20:51:35:

oh dear... right, light has an acquired rest mass, that is, it is travelling very fast... [hmm, simpler...] The basic bit of relativity says E=mcc. light has an enery, we know this, it warms things up (think sunlight) so it has an implied mass (even if it is all energy, a proportion of this is what we call mass) do you can use E/c=p where p is the momentum.

harder:
[What is mass? Discuss - 3000 marks]
[my answer, the stuff we can feel if we hold it in our hand, or the stuff affected by a force]

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