The theory of plate tectonics a. incorporates continental drift but not seafloor spreading b. incorporates seafloor spreading but not continental drift c. incorporates and explains both seafloor spreading and continental drift d. does not incorporate seafloor spreading or continental drift

The experiment done in lab is repeated, using a ball that has unknown mass m. you plot your data in the form of f 2 versus m/l, with f in rev/s, m in kg, and l in m. your data falls close to a straight line that has slope 3.19 m/(kg · s2). use g = 9.80 m/s2 and calculate the mass m of the ball.