Consider the following debate between two students about the cause of the phases of the moon. student 1: the phase of the moon depends on how the moon, sun, and earth are aligned with one another. during some alignments, only a small portion of the moon’s surface will receive light from the sun, in which case we would see a crescent moon. student 2: i disagree. the moon would always get the same amount of sunlight; it’s just that in some alignments earth casts a larger shadow on the moon. that’s why the moon isn’t always a full moon. who is right?

Two manned satellites approaching one another at a relative speed of 0.550 m/s intend to dock. the first has a mass of 2.50 ✕ 103 kg, and the second a mass of 7.50 ✕ 103 kg. assume that the positive direction is directed from the second satellite towards the first satellite. (a) calculate the final velocity after docking, in the frame of reference in which the first satellite was originally at rest.(b) what is the loss of kinetic energy in this inelastic collision? (c) repeat both parts, in the frame of reference in which the second satellite was originally at rest. final velocity(d) loss of kinetic energy = ?