a simple pendulum is shown in several states. in case a the mass is travelling back down to the bottom and is in between the bottom and its max height. in case b the mass is at its max height and has a speed of zero. in case c the ball is at its lowest position.

What is the function of the commutator in a dc motor? a. to spin the magnet b. to change direct current into alternating current c. to change alternating current into direct current d. to spin the wire coil

What color would an object that reflects green and blue light appear to be in white light? a. blue b. cyan c. magenta d. black

When considering gravity acceleration and the force of acceleration, what must be true? a. the direction of acceleration must be perpendicular to the direction of the force. b. the direction of the force and the direction of acceleration must be the same as each other. c. the direction of the force and the direction of acceleration must be opposite of each other. d. the mass of the body must be the same as the acceleration of the body.