3 - The strain gauge rosette indicated in the figure provides the following readings: &o= 400μ, E60= 250μ, E120= -480μ. Using the relations given below, find the magnitudes and directions of the principle strains and the maximum shearing strains. Ex=Eo Ey=1 (2860 +2€120 - Eo) Xxy = 17 (E60-E120) 2 13 30° 120 -X

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British Gravitational Bg System Of Units

Measuring is the comparison of a particular physical quantity with its reference value. A unit is a fixed physical quantity. The length is a physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.