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Inexpensive Resonance Analysis
1.Monte M. Giles, “A resonance demonstration,” Phys. Teach. 12, 178 (March 1974); http://faraday.physics.uiowa.edu/acoust/3A60.30.htm and http://www.fas.harvard.edu/∼scdiroff/lds/Oscillations Waves/BartonsPendulum/BartonsPendulum.html.
2.“Miniature Metal Gear Motor — 71 RPM” (http://www.hobby engineering.com). For the highest frequency shown, this motor required 7.2 V and 50 mA.
3.Of course a more professional‐looking setup can easily be constructed, e.g., the motor can be held with a lab clamp.
4.Timothy J. Moran, “Electricity: From tabletop to power plant,” Phys. Teach. 47, 18–20 (Jan. 2009);
4.Timothy J. Moran, “Applications of sound spectrum analysis,” Phys. Teach. 45, 93–95 (Feb. 2007).
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