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Why are the bridges declared unsafe afte...

Why are the bridges declared unsafe after long use ?

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A bridge during its use undergoes alternating strains a large number of times every day . When a bridge is used for long time it loses its elastic strength . Due to this the strain produced for a given stress may be quite large . Asa result the bridge may collapse . To avoid this the bridges are decleared unsafe after long use .
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BINA LIBRARY-PROPERTIES OF SOLID -EXERCISE
  1. For what stress will the strain be 1% of 0.1?(Y = 12.4*10^11 Nm^(-2))

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  2. Two metalic wires of same length an d same cross - section but differe...

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  3. Why are the bridges declared unsafe after long use ?

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  4. Why do spring balances show wrong reading after long use ?

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  5. The breaking force of a wire is F . What will be the breaking force fo...

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  6. A steel wire 4 m in length and 2.4*10^(-7)m^2in cross - section is str...

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  7. The breaking stress of a material is 9.8*10^(6)dynes /sq.cm. find the ...

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  8. A uniform steel wire of density 7.8 g/cc weighs 8 g and is 125 cm long...

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  9. A rubber cord of radious 2 mm is loaded with a weight of 13 kg . Lengt...

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  10. A steel wire of diammeter 2 mm is pulled to increase its length by 1% ...

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  11. Calculate the force required to increase by 1% length of a rod of cros...

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  12. Two wires of same radius and legth are subjected to the same load . On...

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  13. A wire length L and cross sectional area A is made of material of Youn...

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  14. The following four wires are made of same material and same tensiom is...

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  15. If S is the stress and Y is young's modulus of the material of a wire ...

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  16. A wire suspended vertically from one end is stressed by attaching a we...

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  17. what percentage of length of a wire will increase by applying the stre...

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  18. K is the force constatnt of a spring . The work done in extending it f...

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  19. The difference in properties of a substance in three states of matter ...

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  20. Inter - molecular forces are

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