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The special theory of relativity describes the motion and dynamics of objects moving at significant fractions of the speed of light.

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I modified the problem of Irodov's Problems in General Physics 1.343 as below: A stationary compound solid consisting of a cone and a hemisphere on its circular base has a taper angle 45 degree and a …
asked Sep 24 '16 by Mockingbird
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An equation for momentum, $$p = \gamma mv, \tag{1}$$ then for photon we get some indeterminate momentum which is 0/0. But the formula $E=(m^2c^4+p^2c^2)^{1/2}$ gives for photon $$p=E/c .\tag{2}$$ An …
asked Oct 30 '16 by Mockingbird