Chapter 13: Problem 8
Explain how simple harmonic motion might be used to determine the masses of objects in an orbiting spacecraft.
Chapter 13: Problem 8
Explain how simple harmonic motion might be used to determine the masses of objects in an orbiting spacecraft.
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The muscles that drive insect wings minimize the energy needed for flight by "choosing" to move at the natural oscillation frequency of the wings. Biologists study this phenomenon by clipping an insect's wings to reduce their mass. If the wing system is modeled as a simple harmonic oscillator, by what percent will the frequency change if the wing mass is decreased by \(25 \% ?\) Will it increase or decrease?
Two balls each of unknown mass \(m\) are mounted on opposite ends of a 1.5 -m-long rod of mass \(850 \mathrm{g} .\) The system is suspended from a wire attached to the center of the rod and set into torsional oscillations. If the wire has torsional constant \(0.63 \mathrm{N} \cdot \mathrm{m} / \mathrm{rad}\) and the period of the oscillations is \(5.6 \mathrm{s}\), what's the unknown mass \(m ?\)
A particle undergoes simple harmonic motion with amplitude \(25 \mathrm{cm}\) and maximum speed \(4.8 \mathrm{m} / \mathrm{s} .\) Find the (a) angular frequency, (b) period, and (c) maximum acceleration.
The total energy of a mass-spring system is the sum of its kinetic and potential energy: \(E=\frac{1}{2} m v^{2}+\frac{1}{2} k x^{2} .\) Assuming \(E\) remains constant, differentiate both sides of this expression with respect to time and show that Equation 13.3 results. (Hint: Remember that \(v=d x / d t .)\)
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