Which of the following describes the study of matter and how materials interact with each other at the atomic level, a) physics b) chemistry c) astronomy

Ablock having mass m slides down an inclined plane. the force of friction between the block and the inclined plane is f, the block's weight is m g, and the normal force is n. (a) draw a free – body force diagram showing the forces acting on the block. (b) write down all relevant newton’s equations for a given situation.

Which of the following are appropriate acceleration units?

What happens to an isotope during radioactive decay?