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Unformatted text preview: Problem 4: The mass m = 2 slug and the spring constant is k = 72 lb/ft. The spring is unstretched when x = 0. At t= 0, x = 1 ft, dx/dt = 1 ft/s, and the force F(t) = 10sin 4t + 10cos 4t lb is applied to the mass. What is the position of the mass at t = 2s? 3 Problem 5: The stepped disk weighs 20 lb and its moment of inertia is I = 0.6 slugft 2 . It rolls on the horizontal surface. The disk is initially stationary with the spring unstretched, and t = 0 a constant force F = 10 lb is applied as shown. Determine the position of the center of the disk as a function of time. Problem 6: The frequency of the springmass oscillator is measured and determined to be 4.00 Hz. The oscillator is then placed in a barrel of oil, and its frequency is determined to be 3.80 Hz. If the mass is displaced 0.1 m to the right of its equilibrium position and released from rest, what is its position relative to the equilibrium position as a function of time? *Problems from Bedford & Fowler...
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This note was uploaded on 04/08/2010 for the course MECHENG 240 taught by Professor Perkins during the Fall '09 term at University of Michigan.
 Fall '09
 PERKINS

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