Light spreads out from all directions in a straight line is called?

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

Write a full page that sumerizes thermodynamics it’s from the website visionlearnig

You throw a small rock straight up from the edge of a highway bridge that crosses a river. the rock passes you on its way down, 7.00 s after it was thrown. what is the speed of the rock just before it reaches the water 28.0 m below the point where the rock left your hand? ignore air resistance.