JEE Main Physics question
A load of 1 kg weight is attached to one end of a steel wire of area of cross-section and Young's modulus . The other end is suspended vertically from a hook on a wall. When the load is pulled horizontally and released, when the load passes through its lowest position the fractional change in length is [BITSAT 2008]
Answer: (A)
Solution
After release, the load eventually comes to rest hanging vertically in its lowest (equilibrium) position, where the wire supports only the static weight, so the tension is (note: if instead the strain were evaluated at the instant the load first swings through the lowest point, energy
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