Question: 2 1 . 1 3 The spring constant is and the spring is unstretched when The mass of each object is 3 0 kg .

21.13 The spring constant is and the spring is unstretched when The mass of each object is 30 kg. The inclined surface is smooth. The radius of the pulley is 120 mm and its moment of inertia is At and (a) Determine the frequency and period of the resulting vibration. (b) What is the value of x at t =4 s?

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