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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferHard2 min

PhysicsHardinteger

A steel block is held rigidly so that it cannot expand. It is heated by 100 K. Find the thermal stress in MPa (Young modulus $2 \times 1 0^{11}$ Pa, $α = 1.2 \times 1 0^{- 5}$ $K^{- 1}$ ; nearest whole number).

Answer:

240

Solution:

Stress = $Y α Δ T = 2 \times 1 0^{11} \times 1.2 \times 1 0^{- 5} \times 100 = 240$ MPa. Such a stress can crack a brittle block when it is cooled or heated suddenly.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

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