In an engine, a piston oscillates with simple harmonic motion so that its position varies according to the expression, x = 7.00 cos 4t + ???? 7 where x is in centimeters and t is in seconds. (a) At t = 0, find the position of the piston. (No Response) seenKey 6.31 cm (b) At t = 0, find velocity of the piston. (No Response) seenKey -12.1 cm/s (c) At t = 0, find acceleration of the piston. (No Response) seenKey -101 cm/s2 (d) Find the period and amplitude of the motion. period (No Response) seenKey 1.57 s amplitude (No Response) seenKey 7 cm