The first (living) star other than our own Sun found to have more than one planet orbiting it is called

An observer that stands still as the electron moves by him, will observe

Phase changes are chemical changes. true or false

Determine the fraction of the magnitude of kinetic energy lost by a neutron (m1 = 1.01 u) when it collides head-on and elastically with a target particle at rest which is 21h (heavy hydrogen, m = 2.01 u).