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Exercício de Calorimetria
Exercício:
Uma massa de 100g de agua a 5°c de temperatura é aquecida por merio de uma resistencia eletrica de imersao de potencia 800 W ,durante 30 s .Adote o calor sensivel da agua como 4j/kg.K. Suponha qye todo calor fornecido pela resistencia seja absorvida pela agua .A temperatura final da agua será de??
Eel=Q=800*30=24000J/s
Q=100*4*(Tf-5)
24000=400Tf-2000
Tf=26000/400=65ºC
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um cilindro de prata de 150g esta com temperatura de 200°c. Ao sofrer aquecimento atinge 700°c. Quantas calorias ele recebeu ? Dado calor específico da prata c= 0,56cal/g°c
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