Text-Book of Mechanics Volume 1

Text-Book of Mechanics Volume 1

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 edition. Excerpt: ...between P and Q, assuming the wedge and block HE as weightless. In Figs. 99 and 100 are shown the wedge and block respectively, with all forces acting on the same. From Fig. 99, IX = P-fiR-Ni smd-ftiNi cos 0=o, . (1) 1Y = R-Nl cosd + Ni sin 0 = o.... (2) Exercise 130. Find the relation of P to Q in the machine shown in Fig. 98, if Q is applied normally to AB by means of a block restrained from moving parallel to AB. Section XIV MISCELLANEOUS MACHINES The Bent-lever Balance.--This balance is shown in Fig. 102, where ABC is the bent lever turning about a pivot at B. D is the index Nr which points to some division on the graduated arc MDN. C is the centroid of the lever CBA. Exercise 132. Find the relation existing between (j and W, if W is the load in the pan and is the angle through which BC is displaced from its position, when W=o, by the load W. Assume as constants of the balance BC = a, BA =b, w=weight of pan, Wi= weight of lever CBA, and that when W=o the end A is on a horizontal through B while BC makes an angle /? to the vertical. Exercise 133. Find the relation between F and W in the combination of levers shown in Fig. 103. Fig. 102 Exercise 134. Find the weight, W, that can be sustained by a force of 100 pounds and the pull on each point of support in the combination of pulleys shown in Fig. 104, if the movable pulleys weigh 5 pounds each and the fixed pulleys 3 pounds each. The Differential Wheel and Axle.--This machine is shown in Fig. 105. It is similar to the wheel and axle, but instead of one axle it has two of different diameters with the same rope coiled in opposite directions around them. In the loop of this rope hangs a single movable pulley to which the weight is attached. An end view of the machine is shown in Fig....show more

Product details

  • Paperback
  • 189 x 246 x 2mm | 91g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236972244
  • 9781236972248