Use the orbital velocity law mr=rãv2g to calculate the mass of the central black hole. give your answer in kilograms.

Two thin 80.0- cm rods are oriented at right angles to each other. each rod has one end at the origin of the coordinates, and one of them extends along the x- axis while the other extends along the yaxis. the rod along the x- axis carries a charge of - 15.0 μ c distributed uniformly along its length, and the other rod carries 15.0 μ c uniformly over its length. find the magnitude and direction of the net electrical force that these two rods exert on an electron located at the point (40.0 cm, 40.0 cm). (e

An object's buoyant force and weight mean the same thing.a. trueb. false

The pressure proportional to the area a- inversely b- directly c- increase d-decrease