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Answer 1

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Answer 2

Answer:-

Mass, m = 14.5 kg

Length of the steel wire, l = 1.0 m

Angular velocity, ω = 2 rev/s = 2 × 2π rad/s = 12.56 rad/s

Cross-sectional area of the wire, a = 0.065 cm2 = 0.065 × 10-4 m2

Let Δl be the elongation of the wire when the mass is at the lowest point of its path.

When the mass is placed at the position of the vertical circle, the total force on the mass is:

F = mg + mlω2

= 14.5 × 9.8 + 14.5 × 1 × (12.56)2

= 2429.53 N

Young’s modulus = Strss / Strain

Y = (F/A) / (∆l/l)

∴ ∆l = Fl / AY

Young’s modulus for steel = 2 × 1011 Pa

∆l = 2429.53 × 1 / (0.065 × 10-4 × 2 × 1011) = 1.87 × 10-3 m

Hence, the elongation of the wire is 1.87 × 10–3 m.