A block is hanged by means of two identical wires having cross section area 1mm2 as shown. If the temperature is lowered by ΔT = 10°C, find the mass to be added to hanging mass such that the junction remains at its initial position(α = 2×10-5/°C, Y = 5 × 1011Pa, g = 10m/s²)

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4 kg

8 kg

12 kg

16 kg

answer is C.

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Detailed Solution

Resolving tension into components T sinθ components cancel each otherThermal force m = 12 kg

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