Mass of moving electron is 11 times equal to its rest mass. Find its kinetic energy and momentum.
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Electron's 'rest' mass is 9.11 • 10^-31 kg. So the KE is 1/2mv^ = 1/2(11 • 9.11 • 10^-31 kg)(2.975 • 10^8 m/s)^2= 443.461 • 10^-15 J or 4.4346 • 10^-13 J(Joules). And the momentum is p = mv = (11• 9.11 • 10^-31kg)(2.975•10^8m/s) = 298.125 • 10^-23 kg•m/s or 2.9813 • 10^-21 kg•m/s
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