What method of control is being used in the following scenario? a researcher concerned about the motivation, fatigue, ability, interests, and so on of her participants randomly assigns them to groups.

According to newton’s law of universal gravitation, which statements are true? as we move to higher altitudes, the force of gravity on us decreases. as we move to higher altitudes, the force of gravity on us increases. as we gain mass, the force of gravity on us decreases. as we gain mass, the force of gravity on us increases. as we move faster, the force of gravity on us increases.

Which of these has some mechanical energy? a. an atom b. heat inside earth c. a book on a shelf d. the fire from a lit match

Which is the most accurate name for the covalent compound p2o3?