2. (1 point) Two metal spheres with different radii are each hanging from insulating nylon threads. One of the spheres has a net negative charge, while the other has no net charge. If the spheres are close together but do not touch, they will: A. attract each other B. repel each other C. repel if the sphere with the larger radius is the one that is negatively charged D. repel if the sphere with the smaller radius is the one that is negatively charged E. exert no force on each other

The lights used by mark watley (played by matt damon) during the film the martian seem to be metal halide lamps. metal halide lamps are filled with vaporized mercury and metal-halogen compounds. when an electric current is passed through the lamp, the tube begins to glow a bright white/blue color. if you were to pass this light through a prism to separate the individual light frequencies, you would see a rainbow just as you would if using natural sunlight because of the complexity of the metal halide gas and the vast amount of possible electron transitions. (the study of light in this way is known as spectroscopy and allows astronomers to know exactly what atoms compose distant stars, simply by looking at the light they emit. the spectral lines an atom produces uniquely identifies that atom just like a fingerprint uniquely identifies a person. the momentum equation and energy equation that we have used above can be combined to give the following equation: c = e p where again p is the phonon momentum, e is the photon energy and c is the speed of light. when you divide the photon energy found in #6 by the photon momentum found in #4, do you get the speed of light? (if not, check your work for questions #4 through #6). yes no

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

Which transition by an electron will release the greatest amount of energy? oa ob oc od