The annihilation of matter that ocurs when a proton and an anti-proton collide in a particle accelerator is an experiment that is of interest to physicists

measure their densities same density, same sub

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.

did yall get answers for this yet