The moon with orbital radius 384 000 km takes 27 days to complete the orbiting of
the earth, determine the period of orbiting
for a satellite at height 500 km from the
earth surface.

Which of the following correctly describes the early view of catastrophism?

Mutt and jeff are running along a path each pushing a cart loaded with rocks. if mutt's wagon has a mass two times greater than jeff's and they want to stay together, arriving at their destination at the same time, what must happen? a) jeff should slow down so mutt can catch up. b) mutt must use half as much force to push his cart. c) mutt must use twice as much force to push his cart. d) mutt and jeff will use the same force, but mutt will take bigger steps.

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?