Which of the following is true of electron-spin-resonance dating? a. It measures the breakdown of molecules in teeth to estimate their age. b. It uses a magnetic field to count the number of trapped electrons in apatite crystals. c. It is used to date zirconium crystals and has been used in South Africa where potassium-argon methods can’t be applied. d. It cannot be used on teeth.

Anonzero net force acts on a particle and does work. which one of the following statements is true? the kinetic energy of the particle changes, but the speed of the particle does not change. the kinetic energy of the particle does not change, but the speed of the particle does change. the kinetic energy of the particle changes, but the velocity of the particle does not change. the kinetic energy and the speed of the particle change, but the velocity of the particle does not change. the kinetic energy, speed, and velocity of the particle change.