In some countries, liquid nitrogen is used on daily trucks instead of mechanical refrigerators. A 3.00-hour delivery trip requires 200 L of liquid nitrogen, which has a density of 808 kg/m 3 . (a) Calculate the heat transfer necessary to evaporate this amount of liquid nitrogen and raise its temperature to 3.00 ℃. (Use cp and assume it is constant over the temperature range.) This value is the amount of cooling the liquid nitrogen supplies. (b) What is this heat transfer rate in kilowatt-hours? (c) Compare the amount of cooling obtained from melting an identical mass of 0-℃ ice with that from evaporating the liquid nitrogen.
In some countries, liquid nitrogen is used on daily trucks instead of mechanical refrigerators. A 3.00-hour delivery trip requires 200 L of liquid nitrogen, which has a density of 808 kg/m 3 . (a) Calculate the heat transfer necessary to evaporate this amount of liquid nitrogen and raise its temperature to 3.00 ℃. (Use cp and assume it is constant over the temperature range.) This value is the amount of cooling the liquid nitrogen supplies. (b) What is this heat transfer rate in kilowatt-hours? (c) Compare the amount of cooling obtained from melting an identical mass of 0-℃ ice with that from evaporating the liquid nitrogen.
In some countries, liquid nitrogen is used on daily trucks instead of mechanical refrigerators. A 3.00-hour delivery trip requires 200 L of liquid nitrogen, which has a density of 808 kg/m3. (a) Calculate the heat transfer necessary to evaporate this amount of liquid nitrogen and raise its temperature to 3.00 ℃. (Use cp and assume it is constant over the temperature range.) This value is the amount of cooling the liquid nitrogen supplies. (b) What is this heat transfer rate in kilowatt-hours? (c) Compare the amount of cooling obtained from melting an identical mass of 0-℃ ice with that from evaporating the liquid nitrogen.
In some countries, liquid nitrogen is used on dairy trucks instead of mechanical refrigerators. A 3.00-hour delivery trip requires 250 L of liquid nitrogen, which has a density of 808 kg/m3.
(a)
Calculate the heat needed in kilocalories to evaporate this amount of liquid nitrogen and raise its temperature to 2.50°C. (You must use cp, and you can assume it is constant over the temperature range.) This is the amount of cooling the liquid nitrogen supplies.
(b)
What is this in kilowatt-hours?
(c)
How much cooling in kilocalories would be obtained from melting an identical mass of 0°C ice?
Question 9: a) Some water has frozen in a gutter. The gutter is a cylinder that has a 3 inch diameter and is 8 feet long. If this volume of ice starts to melt, how much heat energy, in Joules, does it take to raise the temperature of the ice from −7 ◦C to 0◦C? The density of ice is 916.9kg/m3 .b) Now that the ice is at 0◦C, how much heat does it take to melt all of the ice into liquid water at 0◦C? c) Finally, how much heat does it take to raise the temperature of the liquid water by 7 more degrees C? Assume the specific heat of water is 4186 J/kg◦C.
Question 10: a) Now suppose the entire volume of the gutter from Question 9 is filled with water which is flowing at a rate of 40 cm3 per second through the gutter. The gutter is connected to a drip irrigation system and splits into six tubes, each going to a different tree. Each of the irrigation tubes is 1 cm in diameter. What is the flow rate through a single irrigation tube in milliliters per second? b) What is the velocity of water…
In some countries, liquid nitrogen is used on dairy trucks instead of mechanical refrigerators. A 3.00-hour delivery trip requires 150 L of liquid nitrogen, which has a density of 808 kg/m3.
(a)
Calculate the heat needed in kilocalories to evaporate this amount of liquid nitrogen and raise its temperature to 3.50°C. (You must use cp, and you can assume it is constant over the temperature range.) This is the amount of cooling the liquid nitrogen supplies.
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