A vertical steel girder( عارضة خشبية ) with a cross sectional area of 0.15 m2has a 1550kg sign hanging from its end. (Ignore the mass of the girder itself.) a)What is the stress within the girder? b)What is the strain on the girder? c)If the girder is 9.50 m long, how much is it lengthened?

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