Agolf club with 65j of kinetic energy strikes a stationary golf ball with a mass of 46g. the energy transfer is only 20% efficient. calculate the initial speed of the golf ball

Two identical small charged spheres are a certain distance apart, and each one initially experiences an electrostatic force of magnitude f due to the other. with time, charge gradually leaks off of both spheres. when each of the spheres has lost half its initial charge, the magnitude of the electrostatic force will be

What are similarities and differences of reflection, refraction, diffraction and absorption?

The ability to make things happen is also called a. heat b. force c. matter d. energy