During a race, a runner runs at a speed of 4 m/s. 4 seconds later she is running at a speed of 8 m/s. What is the runner's acceleration?

Identify the electromagnets with poles that are reversed from the electromagnet shown above

Select all of the statements which are true. electrons are located in shells or orbits around the atom. electrons orbit slowly around the atom. electrons travel in one flat path around the nucleus of an atom. the valence of an atom is determined by the number of electrons in the atom's outermost shell.

Which substance is a steroid? cholesterol fatty acid monosaccharide trans fat