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Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

Forfatter: Guilford L. Molesworth

Sider: 744

UDK: 600 (093)

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383 OF ENGINEERIKG FORMULÆ. Gravity. L = Latitude. . . H = Elevation above sea-level in teet. R, = Radius of earth in feet. _ Force of gravity, feet per second. g = 32-1889 at London at the level of g = 32-088 (1 + -005133 sin. L) (1 jj )' R = 20,923,000 at the equator. = 20,853,000 at the poles. - 20,888,000 mean radius. Centrifugal Force. W = Weight of revolving body in lbs. . It = Radius or distance from centre of motion i N — Number of revolutions per minute. F = Centrifugal force in lbs. __ F = • 00034 W BN2. 2941 F W = B N2 ' . j • Momentum , f onv hodv multiplied by its velocity J aü 5« second). Impulse Is the force (say feet per second) multiplied by the time during which it acts. •
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