1. When a star collapses to form a black hole, its mass

a. decreases

b. remains the same

A charge of 6.4x10^-7 C experiences an electric force of 1.8x10^-1 N what is the electric field strength

Find the escape speed for a rocket leaving the moon. the acceleration of gravity on the moon is 0.166 times that on earth and the moon's radius is 0.273 re. answer in units of km/s.

Two balls of equal mass are thrown horizontally with the same initial velocity. They hit identical stationary boxes resting on a frictionless horizontal surface. The ball hitting box 1 bounces back, while the ball hitting box 2 gets stuck.

Which steps are in the proper order for survival floating. a. surface, rest, sink, breathe b. rest, sink, breathe, surface c. rest, surface, breathe, rest d. sink, breathe, surface, rest

A quantity of gas in a cylinder received 1600j of hear from a hot plate at the same time 800j of work are done on the gas what is the change in the internal energy?

What percent of my Iodine-131 sample will be left after 7 half-lives?

A 58.0 kg snow skier is on the top of 351 m high hill. After she has gone down a vertical distance of 142 m, what is her mechanical energy? Explain your answer (CER) !

A sphere has a mass of 2.10kg and travels along a horizontal plane at the velocity of 12.2m/s. Find the energy

What is the force required to accelerate a baseball with a mass of 0.145 kilograms and an acceleration of 35.00 meters/second squared?

A 4.00 kg stone is dropped from a height of 145 m. What is the stone's potential and kinetic energy respectively when it is 50.0 m from the ground?