Ttakes a star, with 28 times the mass of the sun, 3 years to orbit a black hole. if the average distance between the star and the center of the black hole is 9 au, then the mass contained inside the black hole is msun.

Achemistry student needs of 40ml diethylamine for an experiment. by consulting the crc handbook of chemistry and physics, the student discovers that the density of diethylamine is 0.7 . calculate the mass of diethylamine the student should weigh out. round your answer to significant digits.

Two point charges are on the y axis. a 3.90-µc charge is located at y = 1.25 cm, and a -2.4-µc charge is located at y = −1.80 cm. (a) find the total electric potential at the origin. v (b) find the total electric potential at the point whose coordinates are (1.50 cm, 0). v

Complete the sentence to describe the law of conservation of energy. the law of conservation of energy states that energy cannot be created