A 3-m long thin-walled tube has an equilateral triangular cross-section with a constant thickness of 10 mm. If each side of the triangle is 200 mm measured at the median line and the applied torque is 40 k N-m, what is the angle of twist in degrees

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A: σ=MyII=BH312-bh312=100×150312-80×130312=13478333.33mm4M=1.4k-m

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Q: Refer image below

A: Given data: Steel:L=2 mDi=70 mmDe=100 mmBronze:L=1.5 mD=70 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.