Chegg a “black hole” theoretically has an escape velocity that is greater or equal to the velocity of light (3 x 108 m/s). it the effective mass of the black hole is equal to the mass of the sun (2 x 1030 kg), what is the effective “radius” (called the “schwarzschild radius” of the black hole

Which statement is true? a. kepler's laws apply only to the motion of earth. b. kepler's laws can be used to predict eclipses. c. kepler's laws are true for a central force that is directly proportional to distance. d. kepler's laws can be deduced from newton's laws of motion and gravity.

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

The magnitude of the amount of energy released by burning a fuel source, measured in energy per unit mass, is called its fuel value. note that the fuel value is the negative of the isobaric specific heat of combustion for the fuel. if all the energy obtained from burning 1.23 pounds of butane with a fuel value of 10.85 kcal/g is used to heat 128.0 kg of water at an initial temperature of 18.3 °c, what is the final temperature? note that 1 lb = 453.6 g.