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Why do spring balances show wrong readin...

Why do spring balances show wrong readings after they have been used for a long time?

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A bird is in a wire cage hanging from a spring balance.Is the reading indicated on the balance,when the bird is flying out in the cage greater than ,less than or the same as that when the bird is sitting in the cage ?Explain.

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  10. The stress-strain graphs for materials A and B are shown in Fig. 9.12....

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