Telephone and electrical lines are allowed to sag between poles so that the tension will not be
Question:
(a) Is it possible to have the lines perfectly horizontal? Why or why not?
(b) Suppose that a line were stretched almost perfectly horizontally between two poles that are 30 m apart. If a 0.25-kg bird perches on the wire midway between the poles and the wire sags 1.0 cm, what would be the tension in the wire? (Neglect the mass of the wire.)
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