velocity of the proton in units of km/s

University Physics Volume 3
17th Edition
ISBN:9781938168185
Author:William Moebs, Jeff Sanny
Publisher:William Moebs, Jeff Sanny
Chapter5: Relativity
Section: Chapter Questions
Problem 89AP: (a) All but the closest galaxies are receding from our own Milky Way Galaxy. If a galaxy 12.0x109ly...
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A cyclotron is a machine that can be used to accelerate charged particles to achieve large kinetic energies.  The resulting beams of highly energetic particles then can be used for many medical applications, including Proton Therapy (a more precise form of "radiation" used in the treatment of some cancers).  

If a proton (of mass 1.673x10-27kg) is accelerated to its maximum velocity inside a dee with radius 4.46cm (this is the radius you would use for the "r" term in the centripetal acceleration), and if the magnetic field has a magnitude of 3.49x10-2T, what is the resulting velocity of the proton in units of km/s (kilometer per second)? 

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