As shown, three steel wires, each 29 mm2 in area, are used to lift a mass M. Their unstretched lengths are 19.99 m, 19.98 m, and 20 m. If M= 1,200 kg. what stress exists in the MIDDLE wire? Use E= 215 Gpa. Answer must be in MPa.

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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.