A CFL light bulb turns electrical energy into mostly light in some heat. The prediction of heat in this energy transformation is most likely caused by which law of thermal dynamics
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- An electric power plant uses energy from burning coal to generate steam at 450oC. The plant is cooled by 20oC water from a nearby river. If burning coal provides 100MJ of heat, what is the theoretical minimum amount of heat that must be transferred to the river during the conversion of heat to electric energy? a- 100MJ B- 90MJ c- 60MJ D- 40MJThe 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 thereA heat machine is working between two thermal reservoirs with the temperatures of 800oC and 20oC. ¼ of the work of heat machine is being used to operate a Carnot heat pump. This heat pump draws heat from the outside environment at a temperature of 2oC and transfers it to a home at a temperature of 22oC. Given house is losing a heat of 62000 kJ per hour to the outside world, the heat engine must be supplied to keep the house stable at 22oC. Calculate the minimum amount of heat that should be supplied to the heat machine to keep the house stable at 22 degrees.
- 8.8 J of work expands an ideal gas in a metal piston cylinder in a bucket of ice water from 3.7 cubic centimeters to 9.9 cubic centimeters. How much heat was transferred from the ice water to the gas? If you feel this question is incomplete, please explain HOW it is incomplete.A 58-kg cross-country skier glides over snow as in the figure below. The coefficient of friction between skis and snow is 0.18. Assume all the snow beneath her skis is at 0°C and that all the internal energy generated by friction is added to snow, which sticks to her skis until it melts. How far would she have to ski to melt 1.5 kg of snow?You put heat energy into your car and it does not work . The difference between what you put in and the work it does is the change in internal energy of your car's "system." This is an example of which law of thermodynamics?
- The first law of thermodynamics relates the heat transfer into or out of a system to the change of internal and the work done on the system. How much heat, in joules, is transferred into a system when its internal energy decreases by 165 J while it was performing 27.5 J of work?If I bring a small object at temperature 200C in thermal contact with a large object at the same temperature, a) thermal energy will flow from the large to the small object because the large object has more internal energy. b) thermal energy will flow from the small to the large object because that will increase entropy. c) thermal energy will not flow.