The following equation describes the periodic motion of a particle, for which the unit of h is in feet and the unit of x is in hours. Solve for the amplitude, the frequency, the period, and the phase shift.
h = 5 cos(2πx + π/4)

• A. amplitude = 5 feet; period = 1 hour; frequency = 1 cycle per hour; phase shift = - 1/8 radians
• B. amplitude = 5 feet; period = 1 hour; frequency = 1 cycle per hour; phase shift = 1/8 radians
• C. amplitude = 5 feet; period = 1/2 hour; frequency = 2 cycles per hour; phase shift = - 1/8 radians
• D. amplitude = 5 feet; period = 2 hours; frequency = 1/2 cycle per hour; phase shift = 1/8 radians

Answer: (A)