#classicalmechanics: A hashtag related to classical mechanics
#physics: A hashtag related to physics
#mathematics: A hashtag related to mathematics
#theoreticalphysics: A hashtag related to theoretical physics
#computationalphysics: A hashtag related to computational physics
#nanotechnology: A hashtag related to nanotechnology
#optics: A hashtag related to optics
#nuclearphysics: A hashtag related to nuclear physics
#opticalphysics: A hashtag related to optical physics