Question about Computers & Internet
Does this help, it may be a start.
A Cos[w t - è[t]] + B è''[t]==0, where A and B are arbitrary constants?
If you expand the Cosine term, you get A Cos[w t] Cos[è[t]] + A Sin[w t] Sin[è[t]] +B è''[t] ==0, which can be approximated as:
B è''[t] + A Sin[w t] è[t]== -A Cos[w t]
So is the frequency of small oscillations just Sqrt[(A Sin[w t])/B]?
Posted on Nov 07, 2007
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Posted on Jan 02, 2017
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Franklin wrote, in 1753 It has pleased God in his goodness to mankind, at length to discover to them the means of securing their habitations and other buildings from mischief by thunder and lightning. The method is this: Provide a small iron rod (it may be made of the rod-iron used by the nailers) but of such a length, that one end being three or four feet in the moist ground, the other may be six or eight feet above the highest part of the building. To the upper end of the rod fasten about a foot of brass wire, the size of a common knitting-needle, sharpened to a fine point; the rod may be secured to the house by a few small staples. If the house or barn be long, there may be a rod and point at each end, and a middling wire along the ridge from one to the other. A house thus furnished will not be damaged by lightning, it being attracted by the points, and passing through the metal into the ground without hurting any thing. Vessels also, having a sharp point rod fix'd on the top of their masts, with a wire from the foot of the rod reaching down, round one of the shrouds, to the water, will not be hurt by lightning.
Look for 1/4" thick Copper Bare solid wire near where your Water pipe comes in the Hose or near the Electicty power comer into the house.
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