In 1991 the fly's eye detector in utah observed a cosmic ray with energy 320 eev (i eev-1018 ev). the identity of the primary particle is unknown, but it might have been a gamma ray. what is the photon wavelength for this energy? how does it compare to the size of a proton?

not moving. pos accel,

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

answer( sicar );