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Author Question: 100 grams of liquid nitrogen at 77 K is stirred into a beaker containing 200 grams of 5C water. If ... (Read 82 times)

danielfitts88

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on: Jul 28, 2018
100 grams of liquid nitrogen at 77 K is stirred into a beaker containing 200 grams of 5C water. If the nitrogen leaves the solution as soon as it turns to gas, how much water freezes? (The heat of evaporation of nitrogen is 6.09 cal/gram and the heat of fusion of water is 80 cal/gram.)

Question 2

In braking an automobile, the friction between the brake drums and brake shoes converts the car's kinetic energy into heat. If a 1 500-kg automobile traveling at 30 m/s brakes to a halt, how much does the temperature rise in each of the four 8.0-kg brake drums? (The specific heat of each iron brake drum is 448 J/kgC).


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dreamfighter72

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Reply #1 on: Jul 28, 2018
Answer to Question 1

none

Answer to Question 2

47C


danielfitts88

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Reply 2 on: Jul 28, 2018
Gracias!

bigsis44

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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