NEW IMPROVED METHOD(E)!!!!
1) Have a friend hold your feet in the air while you position the base of your skull on a convenient pivot (preferably an edge of width=0 or a point of width=0, length=0).
2) The point is to hold your body (except your head) upside-down as vertically as possible, the same distance (along a horizontal axis) from the pivot as your head. That is, if your head extends, say, ten inches to one side of the pivot, your body will go no more than ten inches to the other.
3) Start stacking weights on your forehead until your head-side and body-side are balanced. This will be intensely painful, as over 100L of weights will be required. Try to think of something pleasant.
4) The equation for the approximate weight of your head will be:
HEAD = .5(BODY - ADDED)
(nb-I'm sure I'm missing something, as I used all my grade-school physics notes to construct a giant papier-mache nest in the corner of my office, rendering them utterly illegible.)
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