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vlabodo [156]
3 years ago
14

7. En la sala de una casa hay una gran ventana de vidrio, por la que se presenta una pérdida significativa de calor; las medidas

de la ventana son 2,5 m x 1,5 m y 2,8 mm de espesor. Hallar la variación de calor en la unidad de tiempo si la temperatura exterior del vidrio es 16°C y la temperatura interior del vidrio es 20°C 8. De un cubo de 1 m de arista de un material X se saca de un horno a 40°C, se quiere saber qué cantidad de calor está radiando al exterior, si el coeficiente de emisividad (e) es 0,8 9. En un laboratorio hay una cantidad de 30 moles de un gas perfecto que sufre expansión isotérmica (temperatura constante). La presión inicial de esta masa de gas es de 20 atmosferas y el volumen es de 12 litros. Al final de la expansión, el volumen es de 50 litros. Por lo tanto, determine: a. La presión final de la masa de gas b. La temperatura que se produce en la transformación 10. Un sistema pasa de un estado a otro, intercambiando energía con el exterior. Calcular la variación de energía interna del sistema en los siguientes casos: a. El sistema libera 300 cal y realiza un trabajo de 700 J b. El sistema libera 300 cal y sobre él se realiza un trabajo de 500 J c. El sistema recibe 400 cal de calor y realiza un trabajo de 250 J
Physics
1 answer:
jonny [76]3 years ago
7 0

Answer:

I DON'T SPEAK TACO BELL!

Explanation:

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Answer:

heat required in pan B is more than pan A

Explanation:

Heat required to raise the temperature of the substance is given by the formula

Q = ms\Delta T

now we know that both pan contains same volume of water while the mass of pan is different

So here heat required to raise the temperature of water in Pan A is given as

Q_1 = (m_w s_w + m_ps_p)\delta T

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Now similarly for other pan we have

Q_2 = (m_w s_w + m_ps_p)\delta T

Q_2 = (0.5(4186) + 1.50(s))\Delta T

So here by comparing the two equations we can say that heat required in pan B is more than pan A

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