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(PHYS126)[2011](s)quiz~3030^_10057.pdf
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PHYS126 Quiz 2 3-3-2011
Student Name: Student ID: Time 20min
1) Ms A and Ms B are separated by

in their frame,

(Ms
A and Ms B share the same frame). In their frame Ms A gives birth to her daughter 1s before Ms B do. Stanley is a spaceman travelling in a rocket. And he observes that the two babies are born at the same time in his frame,

i.
Deduce the relative speed of Stanley. What is the distance between Ms A and Ms B in ?
From the Lorentz Transformation






ii. Uncle Sam, another spaceman, claims that Ms B gives birth first. Is it possible? Explain.
(within 20 words.) It is possible as the interval between two events is a space\like interval. / If you travel even faster, by symmetry, you can observe the reverse of the consequence./ Or any acceptable answer
2) The rest energy of a certain nuclear particle is 3 GeV and its kinetic energy is 2GeV. Find its momentum (in GeV/c) and speed (in c).