A text book of elementary mechanics, for the use of colleges and schools (1881)
Dana, Edward Salisbury, 1849-1935 · New York, J. Wiley & sons · leaf 271
14 feet, thepower is 60 lbs., and the weight 6 tons (6 X 2240 lbs.): What isthe distance between the threads of the screw? 8. The power-arm of a differential screw is 18 inches; there are6 threads to the inch in the larger screw, and 8 threads in thesmaller; the power is 30 lbs.: What weight can be… … toward B; its velocity (v) at any point M will be thesame (40) as if it had fallen through the vertical heightFF; that is, v* = 2g.FF. (1) Since DMB and DAB are right angles, by geometry,MB* = DB.FB, (2) AB2 = Di?.^. (3) Let ^45 = a, and MB == 2; also, D5 = 2r; substitut-ing these values and…
Mechanics
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