<PRE><B>Question 633670</B>
A proton is traveling at a constant speed of 0.5 c (half the speed of light)
 along a circular path inside a particle accelerator.
  The area enclosed inside the accelerator is 1.6 square kilometers.
  How many times can the proton go around in 80 nanoseconds?
:
We know that light only travels about 30 cm in 1 nanosecond
At half the speed of light: 15 cm
:
80 * 15 = 1200 cm or 12 meters, not even close to making one round
:
No point in finding the circumference and all that stuff.</PRE>