. Practical physics. ation may be writ-ten in the form B/E = Bjr^r. (5) that is, the weigltt lifted on the axle is as many times the force applied to the tvlieel as the radius of the wheel is times the radius oftlte axle. Otherwise stated,tlie meclianieal advantage of the tvheeland axle is equal to the radius oftJie wheel divided hy the radius ofthe axle. The capstan (Fig. 129) is a spe-cial case of the wheel and axle, thelength of the lever arm takino- theplace of the radius of the wheel,and the radius of the barrel corre-sponding to the radius of the The work principle applied to t
. Practical physics. ation may be writ-ten in the form B/E = Bjr^r. (5) that is, the weigltt lifted on the axle is as many times the force applied to the tvlieel as the radius of the wheel is times the radius oftlte axle. Otherwise stated,tlie meclianieal advantage of the tvheeland axle is equal to the radius oftJie wheel divided hy the radius ofthe axle. The capstan (Fig. 129) is a spe-cial case of the wheel and axle, thelength of the lever arm takino- theplace of the radius of the wheel,and the radius of the barrel corre-sponding to the radius of the The work principle applied to the inclined plane. The work done against gravity in lifting a weight B (Fig. 1-30) from the bottom to the top of a plane is evidently equal to B times the height h of the plane. But the work done by the acting force E while the carriage of weight B is being pulled from the bottom to the top of the plane is equal to E times the length I of the plane. Hence the principle of work gives j^i _ j>]^^ ^,. p^/^ = i/k; (6). Fig. 129. The capstan
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysics, bookyear1922
