Problem No. 2 The steel shaft of a socket wrench has a diameter of 8.0 mm. and a length of 200mm (see figure). If the allowable stress in shear is 60 MPa, what is the maximum permissible torque Tmax that may be exerted with the wrench? Through what angle f (in degrees) will the shaft twist under the action of the maximum torque? (Assume G=78 GPa and disregard any bending of the shaft.) d = 8.0 mm T L= 200 mm

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Unit Conversion

Standard units are also called SI units. SI units are used for measuring a physical quantity satisfying certain conditions. There are two types of units: fundamental units and derived units. Fundamental units are physical quantities that are independent, that is, they do not depend on other quantities like mass, length, or time. There are plenty of quantities in our lives which need to be measured and compared. Measuring is the comparison of a particular physical quantity with its reference value. A unit is a measure of a fixed physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.