PROBLEM 39 & 40 May 14 2010

PROBLEM 39 & 40 May 14 2010 - mc 2 includes the...

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Solving Problems 39 and 40 Physics 002C May 12, 2010 Problem 39. What is the speed of an electron ( mc 2 = 0.511 MeV) with kinetic energy 1 MeV? Note the total energy mc 2 is the sum of the rest energy mc 2 plus the kinetic energy. a) 1.511 c; b) 0.647 c; c) 0.804 c; d) 0.338 c; e) 0.707 c. What do you know? MeV MeV MeV 511 . 0 1 511 . 0 so 957 . 2 511 . 0 / 511 . 1 . 2 2 2 / 1 c v so c c v 6469 . 0 1 2 Problem 40. How much more does a given sample of 1 kg of ice weigh when it is melted? The latent heat of fusion of water is 333.6 kJ/kg. The rest energy
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Unformatted text preview: mc 2 includes the internal energy (thermal energy) of the water. a) 3.7 10-3 kg; b) 3.7 10-6 kg; c) 3.7 10-9 kg; d) 3.7 10-12 ; e) 3.7 10-15 kg. What do you know? The rest energy mc 2 changes by 333.6 kJ. Therefore the mass changes by 333.6 kJ/c 2 = = 3.7 10 2 2 16 10 9 / 6 . 333 s m kJ-12 kg....
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