John is traveling north at 20 meters/second and his friend betty is traveling south at 20 meters/second. if north is the positive direction, what are john and betty's speeds? -20 meters/second, 20 meters/second 20 meters/second, 20 meters/second -20 meters/second, -20 meters/second 0 meters/second, 40 meters/second done

Which bonds are found inside a water molecule

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?

The nuclear potential that binds protons and neutrons in the nucleus of an atom is often approximated by a square well. imagine a proton conned in an innite square well of length 105 nm, a typical nuclear diameter. calculate the wavelength and energy associated with the photon that is emitted when the proton undergoes a transition from the rst excited state (n 2) to the ground state (n 1). in what region of the electromagnetic spectrum does this wavelength belong?