A steel tape was exactly 30 m long - Civil Engineering

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A steel tape was exactly 30 m long at 22°C when supported throughout its length under a pull of 10 kg. A line was measured with this tape under a pull of 16 kg and a mean temperature of 33°C and found to be 780 m long. The cross-sectional area of the tape was 0.035 cm and its total weight was 0.695 kg. Coefficient of thermal expansion (a) is 11x10^-6/°C and modulus of elasticity is 2.1x10^6kg/cm². Compute the length if the tape was supported during measurement.

i. At every 30 m and ii. At every 15 m