Which of the following statements about an apple falling from a tree is true? a) its kinetic energy decreases and its potential energy increases. b) its potential energy decreases and its kinetic energy increases. c) its kinetic and potential energies remain constant. d) its mechanical energy increases.

The midpoints? a, b, and c are marked on the histogram. match them to the indicated scores. which? scores, if? any, would be considered? unusual?

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

Which notation is used to represent an alpha particle? a. b. c. d.