# Physics (Stress & Strain)

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What is the factor of safety of a steel hanger having an ultimate strength of 550.000MPa and supporting a load of 79000.000N. The steel hanger in question has a cross sectional area of 7.000cm^2.
ANS = (Round to 3 decimal places)

ultimate strength = 550.000MPa
area = 7.000cm^2 = .07m
Not too sure how to start. A little help would be greatly appreciated. Thanks.

• Physics (Stress & Strain) -

Factor of safety =
=ultimate strength/allowable strength=
= ultimate strength x Area/ Load=
=550•10⁶•7•10⁻⁴/79000=4.873

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