# Handbook of Elementary Physics by N.I. Koshkin, M.G. Shirkevich, F. Leib

By N.I. Koshkin, M.G. Shirkevich, F. Leib

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F f" / `"`"' '"‘ _;-_—.. For small angles of O`? shear the angle erétan az: :1-ig? characterises the UC? relative deformation and is called the shearing strain. :G(L, (1,36) where the coefficient G is called the shear iizodiilus. Compressibility of matter \‘r·’hen a body subjected to pressure in all directions its volume decrest by AV as a result elastic forces arise nliirlr rend to restore the body to its original volume. I relative change in the volaane of a body Q/K produced by ned that the 42 CH.

The magnitude of sliding friction Fi, depends on the nature and quality of finish of the surfaces in contact and on the force pressing the surfaces together (the perpendicular force FD). Ff,:kFp, (1,31) where k is the coefffcient of friction; k depends on the nature and quality of finish of the surfaces in contact, and to a slight degree on the velocity of motion (the dependence on the velocity is usually neglected). ) where k' is a quantity characterising the surfaces in contact; k' has the dimensions of a length.

8. -100 l 3. 500-2,000 40 10 8537 00 Benzene 20 \$10-206 78 . 2 211 1-50 112 20 50-10 102 . 91 111. 77 35. 83 KCFGSCHC 52. 1-1 T 112. 21 72. 0 . 3 . 2F 11-12 FUNDAMENTAL CONCEPTS AND LAWS 45 Table 19 Allowed Stress of Various Materials (kg/mm2) H T--- Allowed Stress Material """`;““"""""""°__`—‘_‘”` tension l in conipressio Aluminiur 3-8 3-8 Brick masonry 0. 07 0. l-U. 3-l Pine, across grain —- 0 I5-O. 7-l l-l Steel, alloyed, for ma building and m Steel (grade 3) I4 Steel, carbon, Iiuilding . I6-25 Stone masonry Up to U.

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