The apprentice, or First book for mechanics, machinists, and engineers (1860)
Byrne, Oliver · New York, P. J. Cozans · leaf 42
Ques, 9. The weightof the lever S R, of thefirst order = 31 lbs.; SR = 85 inches; S F =55 ; A F = 43 ; B F =19 ; and W = 34 lbs.Required P? PRACTICAL MECHANICS. 37 P X 43 + 31 X 3| = W X 19, P=:^ 34 X 19 — 31 X 3 43 2 12* lbs. Ques. 10. The weight of alever of the second order =8 lbs. S R = 80… … 76 — 802 = 36 W X 2-|-8 X 36 = 100 X 70,,•. W = 3356 lbs. Ques. 11. A beam R S, whose weight is 4 cwt., is sup-ported by props at A and F ; a weight W, of 20 cwt. isplaced at B ; it is required to determine the pressures onthe props, when R S = 50 feet; F R = 2 feet; B F = 12feet: A F = 30 feet ?…
Mechanics, Applied
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