Aflashlight beam strikes the surface of a pane of glass (n=1.56) at a 71° angle to the normal. what is the angle of refraction? express your answer using two significant figures

How would you place two electrons on a sphere of radius r so that the electrostatic potential energy is minimized. how would you place three electrons to solve the same problem.

Is it possible to use the energy from two atoms colliding to create a clean burning lasting fuel source with a large amount of force? is it also possible to harness that energy from the two atoms colliding to create a clean energy source that will last for years from just two atoms colliding. is there a possibility to control and store that energy for years but slowly let the energy out enough to power cities cheaper and faster.

Can anybody me with this? ? (picture included.)