SHM in a Car Engine?. The motion of the piston of an automobile engine is approximately simple harmonic. (a) If the stroke of an engine (twice the amplitude) is 0.100 m and the engine runs at 4500 rev/min, compute the acceleration of the piston at the endpoint of its stroke. (b) If the piston has mass 0.450 kg, what net force must be exerted on it at this point? (c) What are the speed and kinetic energy of the piston at the midpoint of its stroke? (d) What average power is required to accelerate the piston from rest to the speed found in part (c)? (e) If the engine runs at 7000 rev/min, what are the answers to parts (b), (c), and (d)?
Chapter 2 from “Mastering the World of Psychology” by Samuel E. Wood, Ellen Green Wood, Denise Boyd, 5 edition Pg 39. Lesion: injury to a specific part of the nervous system *scientists used to rely on studying changes in people with injuries to understand the nervous system Electroencephalogram (EEG): a record of brain wave activity *can’t show what happens in individual neurons Microelectrode: small wire used to monitor activity in a single neuron Pg 40. CT scan: “a brain scanning technique that uses a rotating computerized x ray tube to produce cross sectional images of the structure of the brain” (can’t show brain activity) MRI: “a diagnostic scanning technique that produces high resolution images of the structure of the brain” (no harmful x rays