. The Ontario high school physics. and therefore F ^ difference of circumferences of A and B THE INCLINED PLANE 77 PROBLEMS1. A mail weighing IGO pounds is drawn up out of a well by means of awindlass, the axle of which is 8 inches in diameter, and the crank 24inches long. Find the force required to be applied to the Fig. 94.—Windlass, with gearing, such as is usta uiUi a pile-driver. 2. Calculate the mechanical advantage of the windlass .shown in The length oi the crank is 16 inches, the small Avheel has 12 teethand the large one 120, and the diameter of the drum about which
. The Ontario high school physics. and therefore F ^ difference of circumferences of A and B THE INCLINED PLANE 77 PROBLEMS1. A mail weighing IGO pounds is drawn up out of a well by means of awindlass, the axle of which is 8 inches in diameter, and the crank 24inches long. Find the force required to be applied to the Fig. 94.—Windlass, with gearing, such as is usta uiUi a pile-driver. 2. Calculate the mechanical advantage of the windlass .shown in The length oi the crank is 16 inches, the small Avheel has 12 teethand the large one 120, and the diameter of the drum about which the ropeis wound is 6 inches. If a force of 60 pounds be applied to each crank how great a weightcan be raised ? (Neglect friction.) 92. The Inclined Plane. Let a lieavj- mass, such as a barrelor a box, be rolled or dragged up aninclined plane AC (Fig. 95) whoselength is I and height /^, by means ofa force F, parallel to tlie plane. Tliework done is i^ X ^. Again the weight is raised throntrlia height Ji and so, neglecting friction,the work done = W X h. , Hence Fl = Wh, and —- _ -,F h that is, tlie mechanical advantage is the ratio of the length tothe height of the plane.
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