Another cause of sunspots may be solar jet stream " torsional oscillation ".
2.
The torsion pendulum executes only two torsional oscillations per minute, which is 1 / 30 the rate of the pendulum in a grandfather clock.
3.
According to the two engineers, the failure of the bridge was related to a wind-driven amplification of the torsional oscillation that, unlike a resonance, increases monotonically with increasing wind speed.
4.
The user s guide for the current American Association of Physics Teachers ( AAPT ) DVD states the bridge collapse was not a case of resonance . Bernard Feldman likewise concluded in a 2003 article for the Physics Teacher that for the torsional oscillation mode, there was no resonance behavior in the amplitude as a function of the wind velocity .
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