. The principles of physics. 82. pounds applied at its circumference may be in equilibrium with a resist-ance of 600 pounds applied to its axle, which is 3 inches in diameter ? 27. How would you calculate the mechanical advantage gained by amachine like that of Fig. 81 ? (On the axle A is an endless screw a, bymeans of which motion is communicated from the axle to the wheel W.) COMBINATION OF MACHINES. 115 28. a. Where is the fulcrum in a claw-hammer (Fig. 82) ? 6. Whatis the ratio of the mechanical advantage gained by means of it ? 29. In its technical meaning, a perpetual motion machine is n
. The principles of physics. 82. pounds applied at its circumference may be in equilibrium with a resist-ance of 600 pounds applied to its axle, which is 3 inches in diameter ? 27. How would you calculate the mechanical advantage gained by amachine like that of Fig. 81 ? (On the axle A is an endless screw a, bymeans of which motion is communicated from the axle to the wheel W.) COMBINATION OF MACHINES. 115 28. a. Where is the fulcrum in a claw-hammer (Fig. 82) ? 6. Whatis the ratio of the mechanical advantage gained by means of it ? 29. In its technical meaning, a perpetual motion machine is not amachine that will run indefinitely, but a machine which can do workind^nitely witJiout the expenditure of energy. Show that such a machineis imt) SECTIOIf OF MACHINES. 91. Combination of pulleys.—As has been shown (p. 98),mechanical advantage is gained with the movable pulley. InFig. 83, M, the cord passing around the movable pulley maybe supposed to be divided into two parts each supporting half M N 3.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysics, bookyear1895
