By J. O. Bird and P. J. Chivers (Auth.)
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Extra resources for Newnes Physical Science. Pocket Book for Engineers
A malleable material is capable of undergoing plastic deformation without fracture. Shear stress and strain 17 For a shear force the shear stress is equal to force/area, where the area is that which is parallel to the direction of the force. T h e symbol for shear stress is the Greek letter tau, τ. 7 shear strain y = - . e. shear stress shear stress C=-. 4 of the modulus of elasticity, E . 8 τΤΟΘ where τ = shear stress at radius r T= torque on shaft J = polar second moment of area of section of shaft G = modulus of rigidity 0 = a n g l e of twist (radians) in a length / of shaft.
5 integer and λ is the wavelength there will be constructive interference and a maximum intensity occurs on the screen. 6, the path difference is BC, that is, d sin Θ. 7. T h e pattern is modified by the type of diffraction pattern produced by a single slit. 7 7 A diffraction grating is similar to the two slit arrangement, but with a very large n u m b e r of slits. Very s h a φ values of maximum intensity are produced in this case. If the slit separation is d and light is incident along the normal to the grating, the condition for a maximum nX = d sin Θ.
S2X—S,X) is called the path difference. If (S2X—SjX) = «A, where η is an integer, and λ is the wavelength, the waves arriving a t X from Sj a n d S2 must be in phase. ) At X , constructive interference takes place a n d the resultant amplitude is a maximum. At a second point, Y, positioned such that ( S j Y - S i Y ) = («H--J)A, the waves arriving at Y from Sj a n d Sj are out of phase. T h e resultant amplitude at Y is a minimum and destructive interference has taken place. 2 ( S 2 Y - S , Y ) = A, that is, n=\).
Newnes Physical Science. Pocket Book for Engineers by J. O. Bird and P. J. Chivers (Auth.)