Light from a laser forms a 1.31-mm diameter spot on a wall. if the light intensity in the spot is what is the power output of the laser?

Which surface feature of the moon is characterized by mountainous areas? terrae craters maria regolith

How many neutrons does plutonium -196 with an atomic number of 78.

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 = ?