A copper cylinder 150mm outside diameter has walls 25mm thick. End plates are stayed by a 25mm diameter bar of steel which passes through the cylinder and is just tight at -11°C. Estimate the stress in cylinder and stay when steam at atmospheric atmosphere (100°C) is admitted. Assume the end plates do not deform. Use the following values: ac = 17 x 10-6/°C Ec = 117 GPa a, = 12 x 106/°C Es = 200 GPa

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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.