Give some examples of applications that resulted from work done by physicists

The heliocentric and the geocentric models of the solar system included these central principles

Ben (55kg) is standing on very slippery ice when junior (25kg) bumps into him. junior was moving at a speed of 8 m/s before the collision and ben and junior embrace after the collision. find the speed of ben and junior as they move across the ice after the collision. give the answer in m/s. describe the work you did to get the answer.

Thermal radiation gets its name because