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## Homework Statement

In a certain accelerator, protons of kinetic energy 1.6 x 10^-7 J move round a circular path of diameter 2000m .

Calculate:

(a) the centripetal acceleration

(b) the mass

ans for a is 9x10^13 ms-2, for b is 1.78 x 10^-24 kg

## Homework Equations

centripetal acceleration = v^2 / r

relativistic KE = (gamma - 1)mc^2

## The Attempt at a Solution

I initially thought I could use the relativistic KE formula to find the velocity of the protons, then find the centripetal acceleration (and i got the answer, apparently, using the mass of protons as 1.67 x 10^-27, but this would contradict with the second part).

I'm not so sure why the mass of the protons would differ and how to go about getting the centripetal acceleration, otherwise ><..

thanks for any help :)