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1- what is the maximum acceleration of platform that oscillates at amplitude 2.20 cm and frequency 6.60hz?


15- an oscillator consists of a block attached to a spring (k=400N/m). at some time t, the position (measured from the system's equilibrium location ),velocity, acceleration of the block are
x=0.100m, v=-13.6m/s, and a=-123m/s2. calculate (a) the frequency of oscillation , (b) the mass of the block , and (c) the amplitude of the motion.


88- a simple pendulum of the length 20cm and mass 5.0 g is suspended in a race car traveling with constant speed 70m/s around a circle of a radius 50 cm. if the pendulum undergoes small oscillation in a radial direction about its equilibrium position , what is the frequency of oscillation?