Astudent swings his keychain around in a circle. what is the source of the centripetal force for this action?

Write a paragraph that provides examples of each stage of volcanic activity, a description of the volcano, and facts about each stage.

What is the polyatamic ion of thiosulfate

Suppose that some of the compound spilled out of the crucible after it was heated. would that cause the percent by mass of water in the compound determined by the experiment to be too low, too high, or unchanged? briefly explain your answer.