- #1
smij44
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help with velocity in relativistic momentum?
a proton has 1836 times the rest mass of an electron. At what speed (in c) will an electron have the same momentum as a proton moving at .0180c?
-- here's what i have so far------------------------
1. by using the mass of a proton i determined the momentum of the electon as p proton= p electron
p proton= (1.673e-27 * .0108*3e8)/(1-.0108^2)^1/2
p proton= 9.035e-21
i am having trouble converting the equation p= m1*v1/(1-(v1/c)^2)^1/2 into an equation that i can use to find the velocity of the electron. All of the answers i get seem to put c well over one... any ideas? any help would be greatly appreciated.
a proton has 1836 times the rest mass of an electron. At what speed (in c) will an electron have the same momentum as a proton moving at .0180c?
-- here's what i have so far------------------------
1. by using the mass of a proton i determined the momentum of the electon as p proton= p electron
p proton= (1.673e-27 * .0108*3e8)/(1-.0108^2)^1/2
p proton= 9.035e-21
i am having trouble converting the equation p= m1*v1/(1-(v1/c)^2)^1/2 into an equation that i can use to find the velocity of the electron. All of the answers i get seem to put c well over one... any ideas? any help would be greatly appreciated.