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A copper cube measures 6.00 cm on each side. The bottom

Chapter 5, Problem 37E

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QUESTION:

A copper cube measures 6.00 cm on each side. The bottom face is held in place by very strong glue to a flat horizontal surface, while a horizontal force ?F ?is applied to the upper face parallel to one of the edges. (Consult Table 1.1.) (a) Show that the glue exerts a force ?F ?on the bottom face that is equal but opposite to the force on the top face. (b) How large must ?F ?be to cause the cube to deform by 0.250 mm? (c) If the same experiment were performed on a lead cube of the same size as the copper one, by what distance would it deform for the same force as in part (b)?

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QUESTION:

A copper cube measures 6.00 cm on each side. The bottom face is held in place by very strong glue to a flat horizontal surface, while a horizontal force ?F ?is applied to the upper face parallel to one of the edges. (Consult Table 1.1.) (a) Show that the glue exerts a force ?F ?on the bottom face that is equal but opposite to the force on the top face. (b) How large must ?F ?be to cause the cube to deform by 0.250 mm? (c) If the same experiment were performed on a lead cube of the same size as the copper one, by what distance would it deform for the same force as in part (b)?

ANSWER:

Solution 37E This question is based on the concept of shear modulus. Mathematically, shear modulus is expressed as Shear modulus = Shear stress Shear strain Shear strain on the other hand is force per unit area and shear strain is the ratio of the deformation to transverse length. Given that, length of each side of the cube h = 6.00 cm h = 0.06 m (a) The bottom of the cube is fixed to the horizontal surface with a very strong glue. Thus the bottom will not move upon t

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