Which of the following has to happen before the eardrum begins to vibrate with the same frequency as the source of the sound waves? a. vibrations have to be transmitted to the fibers of the auditory nerve. b. impulses have to be sent to the brain through the auditory nerve. c. the outer ear has to collect the sound waves and lead them to the middle ear. d. the brain has to interpret the direction from which the sounds are being delivered.

Which statement is true? a) the work done to lift an object 6 meters is greater than the gravitational potential energy it gains. b) the work required to push an object is less than the work required to pull an object the same distance. c) the work required to raise an object to a height is equal to the gravitational potential energy the object gains. d) the work done against gravity to lift an object straight up is greater than the work required to roll it up a ramp.