3A70.45 - Coupled Resonance - Springs
Place the springs on the hooks of the crossbar. Hang 1000 gram masses from the large springs and 500 gram masses to the smaller springs. Start one of the masses oscillating and eventually enough energy will transfer to the other identical system. Only the systems that are identical will show any appreciable resonance.
H. Ric Blacksten, "Exploring Resonance Phenomena", TPT, Vol. 32, #9, Dec. 1994, p. 554.
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