What determines the color of light

Scientists and astronomers have found that in galaxies with central black holes, there are also large star formations near those black holes. What has this led researches to conclude? A. that star formations create black holes B.

a man has five 60w bulb and a 240w water heater in his apartment. if the bulb and water heater are switched on for four hours daily and the cost of electricity is $1.50 per kwh. calculate his bill for 30days.

Which of two factors influence the weight of an object due to gravitational pull?

0.5 kg air hockey puck is initially at rest. What will it's kinetic energy be after a net force of. 8 N acts on it for a distance of 2 m

A neutral atom of aluminum has 14 neutrons and 13 protons. How many electrons does this aluminum have? 1 13 14 27

Consider two rocks with masses of 1 and ten kilograms. What is the relation between their inertia's? Between their masses? Between their weights on earth?

If a cart of 4 kg mass has a force of 8 newtons exerted on it, what is its acceleration?

Why does the liquid thermometer work?

What energy do electrons have when they are farther away from the nucleus?

200 525000 lololo Boat A is 10 km north of a port. Boat B is 5 km east of the same port. Boat A sails in a straight line towards boat B. Work out the bearing on which boat A sails.