A black hole is

an object so diffuse that light leaving it is bent totally back to center of the universe.

an object so diffuse that light approaching it is blocked from view.

an object so dense that light leaving it is bent totally back to the nearest star.

an object so dense that light leaving it is bent totally back to the object.

According to the law of conservation of mass, in a chemical reaction the total starting mass of all the reactants equal the total final mass of all the products. true or false?

Energy is the ability to do work which measures what

Atriangle with equal sides of length 10 cm has -2.5-nc charged objects at each corner. part a determine the direction of the electrical force exerted on the object at the top corner due to the two objects at the horizontal base of the triangle. determine the direction of the electrical force exerted on the object at the top corner due to the two objects at the horizontal base of the triangle. horizontally rightward vertically downward vertically upward horizontally leftward