What types of refrigeration units are used to chill water for air-conditioning purposes?
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What types of refrigeration units are used to chill water for air-conditioning purposes?
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- Over the course of a day, 4.0 kg of water evaporates from the leaves of a corn plant. a) How much energy is required to evaporate the water? (Assume that the temperature of the leaves is 30C.) b) If the plant is active for 12 hours, how much power does this correspond to? You can think of this as the necessary power to drive transport in the plant.The air inside a bicycle tire pump has 26.2 joules of heat conducted away from while 88.5 joules of work done are being done on it. What is the change in internal energy of the air?The urban heat island effect is often strongest at night when temperatures would typically drop. What does this indicate about energy transfer and the material used in the building? (a) The material in buildings releases more energy at night than it absorbs during the day (b) The material in buildings absorbs a lot of energy during the day and when it gets colder at night the energy is released back into the cooler air. (c) The material in buildings absorbs energy during the day and releases it because the temperature of the buildings is lower than the cooler air (d) The material in buildings releases a lot of energy into the hot air during the day so at night all of the energy is still there
- The air inside a bicycle tire pump has 14 joules of work done on it as 8.8 joules of heat is conducted away from it. What is the change in internal energy of the air? Calculate answer to one decimal.A 0.288-kg coffee mug is made from a material that has a specific heat capacity of 930 J/kg C° and contains 0.319 kg of water. The cup and water are at 25.6 °C. To make a cup of coffee, a small electric heater is immersed in the water and brings it to a boil in two minutes. Assume that the cup and water always have the same temperature and determine the minimum power rating of this heater. Number i Units