I need help with Physics homework PLEASE

Posted on 2014-04-03 07:48:00 in Physics by VALERIE

1). A die is designed to punch holes with a radius of 9.70 10-3 m in a metal sheet that is 2.40 10-3 m thick, as the drawing illustrates. To punch through the sheet, the die must exert a shearing stress of 3.50 108 Pa. What force vector F must be applied to the die?



2). A square plate is 1.4 10-2 m thick, measures 2.6 10-2 m on a side, and has a mass of 6.5 10-2 kg. The shear modulus of the material is 5.0 1010 N/m2. One of the square faces rests on a flat horizontal surface, and the coefficient of static friction between the plate and the surface is 0.95. A force is applied to the top of the plate, as in figure (a). Determine the maximum possible amount of shear stress, the maximum possible amount of shear strain, and the maximum possible amount of shear deformation ?X (see figure (b)) that can be created by the applied force just before the plate begins to move.

a). (a) the maximum possible amount of shear stress

(b) the maximum possible amount of shear strain

(c) the maximum possible amount of shear deformation ?X that can be created by the applied force just before the plate begins to move

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