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Determine the deflection

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The rigid bar ABCD is suspended from three identical wires as shown. The cross-sectional are of each wire is A, the unloaded length of each wire is L, and the elastic modulus is E. Knowing that a = b, determine the deflection in wire A, B and D caused by the load P applied at C.

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The deflection of a wire in a rigid bar is determined.

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Determine the stress in a stay at a given temperature

A steel 'stay' of effective length 5m is fitted in between the walls of a ships refrigerated compartment when the temperature is 18 degrees centigrade.
Assume zero stress in the stay on completion of fitting. when the temperature falls to -10 degrees centigrade, the gap between the walls is reduced by 0.5mm.
Determine the stress in the 'stay' at this temperature.

Coefficient of linear expansion = 11 x 10^-6 per degrees centigrade.

Modulus of Elasticity = 210 GN m^-2

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