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Please help how to solve this problem...calorimetry problem....

Please help how to solve this problem...calorimetry problem....

Question Image
Grade:11

1 Answers

Arun
25763 Points
2 years ago
Density of block = 6000 kg/m^3Mass = 1.2Kg => Volume = 0.0002 m^3Buoyant force on block(Fb) = (Volume of block)× (density of water)× g=> Fb = 0.0002×1000×10 = 2N (appx)Weight of block = mg = 12N (appx)=> Net force on spring = mg-(Fb) = 10N (appx)or kx = 10 => x = 10÷200 = 0.05 MTherefore, elastic potential energy of spring = 0.5kx^2 = 0.5 × 200 × 0.05^2 = 0.25JGravitational potential energy of block = mgh = 1.2 × 10 × 0.4 = 4.8J=> Total energy = 5.05JNow, Total energy = Heat of system = Internal energy of block + Internal energy of water => 1.2 × 250 × ∆T + 0.26 × 4200 × ∆T = 5.05JTherefore, ∆T = 5.05 ÷ (300+1092) = 0.003 ℃ or 0.003 K (appx)

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