HELP PLEASE A moon revolves around a planet with a speed of 9.0×1 0 3 m/s. The distance from the moon to the center of the planet is 5.43×1 0 6 m. What is the orbital period of the moon?

Give an example of a collision in real life. use the law of conservation of energy to describe the transfer of momentum. be sure and discuss the momentum before and after the collision occurs. you will need at least 3 sentences to thoroughly answer this question.

If element x has 99 protons how many electrons does it have

Which system of units is used by only a small number of countries in the world, including the u.s.