The pinion gear A rolls on the gear racks B and C.

If B is moving to the right at 10 ft/s and C is moving to the left at 6 ft/s, determine the angular velocity of the pinion gear and the velocity of its center A. State your answer as a vector and indicate your coordinate system.

Which configuration would produce an electric current? a) rotate a coil of copper wire between two magnets. b) connect a wire between a copper and zinc strip sitting in a beaker of water. c) connect a wire to the (+) positive end of a battery and the other end to a light bulb. d) connect a wire to the negative end of a battery and the other end to a light bulb.

If gases like carbon dioxide and methane make up less than 1% of the total atmosphere, why is it important for scientists to monitor changes in percentages of these gases?

What are similarities and differences of reflection, refraction, diffraction and absorption?