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In an engine, a piston oscillates with simple harmonic motion so that its position varies according to the following expression, where x is in centimeters and t is in seconds. x = (5.00 cm) cos(t + ?/7)

(a) At t = 0, find the position of the piston. Correct: Your answer is correct. cm

(b) What is its velocity? Incorrect: Your answer is incorrect. Your response differs from the correct answer by more than 100%. cm/s

(c) What is its acceleration? Incorrect: Your answer is incorrect. Your response differs from the correct answer by more than 100%. cm/s2

(d) Find the period and amplitude of the motion. s cm

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