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Practical Shop Mechanics and Mathematics

Practical Shop Mechanics and Mathematics


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 Excerpt: ... equivalent of the work necessary to overcome a greater resistance through a smaller space, or the equivalent of the work necessary to move a large weight through a small distance. But the work done by a machine is always less than the energy supplied, due to losses in friction, heating, etc. This relation of work done to the energy supplied is an expression of the efficiency of the machine, and is commonly stated as the relation of output to input. Efficiency is commonly stated as a per cent. As the losses in a machine become less, its efficiency increases. In all calculations, unless otherwise stated, we will assume that the work done equals the energy supplied, and express it by the form: PXdi = WXd2, where in the case of moving a weight with a certain force; P = applied force in pounds; di = distance in feet applied force moves through; W = weight to be lifted or resistance to be overcome; d2 = distance in feet through which the weight is lifted or the resistance is overcome. Example. A 250-lb. weight on a pile-driving machine is dropped upon a pile from a height of 15 ft. At each fall the pile is driven 3 ins. into the ground. Assuming that none of the energy due to the velocity of the falling weight is lost in overcoming the friction on the slide, what is the resistance offered by the pile? According to the above rule: 250 lbs. X15 ft. =3750 ft.-lbs. = energy supplied in driving pile 3 ins. 3" (or i ft.) X resistance in pounds overcome=work done or energy expended. That is 3750 = jX resistance in pounds overcome. Reduced to its simplest form this equals 15,000 lbs., the resistance in pounds overcome. This also equals force acting upon the head of the pile. PROBLEMS INVOLVING THE USE OF THE WORK FORMULA 1. 132 gallons of sea-water arc pumped from ...


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Product Details
  • ISBN-13: 9781152581791
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 26
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 1152581791
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 68 gr


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