Ten seconds after an electric fan is turned on, the fan rotates at 300 rev/min. its average angular acceleration is

Apositive rod is placed to the left of sphere a, and the spheres are separated. which best describes the spheres? sphere a is negative and sphere b is positive because protons from sphere a are attracted to the rod and move to sphere b. sphere a is negative and sphere b is positive because electrons from sphere b are attracted to the rod and move to sphere a. sphere a is positive and sphere b is negative because electrons from the rod move to sphere b and protons then move to sphere a. sphere a is positive and sphere b is negative because protons move from sphere b to the rod and also to sphere a.

How have the competing explanations' experiments on atoms affected the development of the atomic model?

Acompound machine is also called a machine. a. force b. simple c. complex d. directional