Chapter 13: Problem 8
Explain why the frequency of a damped system is lower than that of the equivalent undamped system.
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Chapter 13: Problem 8
Explain why the frequency of a damped system is lower than that of the equivalent undamped system.
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A \(450-\mathrm{g}\) mass on a spring is oscillating at \(1.2 \mathrm{~Hz}\), with total energy \(0.51 \mathrm{~J}\). What's the oscillation amplitude?
The human eye and the muscles that hold it can be modeled as a mass-spring system with typical values \(m=7.5 \mathrm{~g}\) and \(k=2.5 \mathrm{kN} / \mathrm{m}\). What's the resonant frequency of this system? Shaking your head at this frequency blurs vision, as the eyeball undergoes resonant oscillations.
A \(280-\mathrm{g}\) volleyball with a \(21.0-\mathrm{cm}\) diameter is suspended by a wire and is undergoing torsional oscillations at \(1.57 \mathrm{~Hz}\). Find the torsional constant of the wire.
This problem explores what would happen if a hole were drilled through Earth's center and out the other side, and an object were dropped into the hole. Approximating Earth as a uniform solid sphere, the gravitational acceleration within the planet (including inside the hypothetical hole) would be \(g(r)=g_{0}\left(r / R_{\mathrm{E}}\right)\), where \(g_{0}\) is the value at Earth's surface, \(r\) is the distance from Earth's center, and \(R_{\mathrm{E}}\) is Earth's radius. This gravitational acceleration is directed toward Earth's center. (a) Write an expression for the force on a mass \(m\) at any point \(r\) in the hole, apply Newton's second law, and show that you get an equation analogous to Equation 13.3. Neglect air resistance. (b) Use your analogy to find an expression for the period of the simple harmonic motion that results when the mass is dropped into the hole. (c) Use appropriate values to find a numerical value for the period, and compare with the period for circular low- Earth orbit that we found in Chapter 8 .
A particle undergoes simple harmonic motion with amplitude \(27 \mathrm{~cm}\) and maximum speed \(4.6 \mathrm{~m} / \mathrm{s}\). Find the (a) angular frequency, (b) period, and (c) maximum acceleration.
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