Answer the following. (a) How much energy is necessary to heat 8.0 kg of water from room temperature (20°C) to its boiling point? (Assume no energy loss.) kcal (b) If electrical energy were used, how much would this cost at 54c per kwh?

A power plant burns coal and generates an average of 615.0 MW of electrical power while discharging 1020.90 MW as waste heat. Find the total electrical energy generated by the plant in a 30-day period. Submit Answer Tries 0/5 This discussion is closed. Send Feedback

The average electricity consumption of a house in Gainesville is known to be 1,007 kWh in a month (One month = 30 days). They would like to install solar panels of 29 % efficiency to generate this electricity. Given that the average solar power density in Gainesville is 5.47 kWh/m2/day, how much surface area must the panels occupy? Calculate the result in m2 but do not write the unit. Round off %3D you answer to a whole number (zero decimal place.)

As a gasoline engine is running, an amount of gasoline containing 13,600 J of chemical potential energy is burned in 1 s. During that second, the engine does 3,400 J of work. (a) What is the engine's efficiency (in percent)? % (b) The burning gasoline has a temperature of about 4,100°F (2,500 K). The waste heat from the engine flows into air at about 90°F (305 K). What is the Carnot efficiency (in percent) of a heat engine operating between these two temperatures? Need Help? % Read It

Solar panels are rated by their theoretical maximum output capacity. A 2-kW PV panel would theoretically produce 2 kW of electricity at its maximum output (during peak solar radiance). If the average daily peak sun-hours in Philadelphia are approximately 4.0 hr and a rowhome is outfitted with 10 PV panels each having a capacity of 260 W, how much energy (kilowatt x hours) would be generated in one year (in units of kWh/year)?

An electric heater transfers 8.90 ✕ 105 J into a block of ice with a mass of 2.16 kg and an initial temperature of 0°C. (a) How much of the energy (in J) supplied by the heater goes into melting all the ice into liquid water? (Enter your answer to at least three significant figures.)  J (b) How much of the energy (in J) supplied by the heater goes into raising the temperature of the liquid water? (Enter your answer to at least three significant figures.)  J (c) What is the final temperature of the liquid water in degrees Celsius?  °C

In an air conditioner, 12.65 MJ of heat transfer occurs from a cold environment in 1.00 h. (a) What mass of ice melting would involve the same heat transfer?              (b) How many hours of operation would be equivalent to melting 900 kg ofice?                                                                                                                    (c) If ice costs 20 cents per kg, do you think the air conditioner could be operated more cheaply than by simply using ice? Describe in detail how you evaluate the relative costs.

A hot water heater in a residential home runs for an average of 2.2 hours per day with a heat energy input of 3.7 kW. What would be the annual cost for hot water in this home using a gas hot water heater if the cost of natural gas is $0.33/m3? The gas water heater can get 23 MJ of energy from 1 m3 of natural gas. [round your final answer to zero decimal places]?

My computer uses 15 W, if I run it for 3 hours how many Joules have I used?

As a gasoline engine is running, an amount of gasoline containing 18,500 J of chemical potential energy is burned in 1 s. During that second, the engine does 3,700 J of work. (a) What is the engine's efficiency (in percent)?  % (b) The burning gasoline has a temperature of about 4,100°F (2,500 K). The waste heat from the engine flows into air at about 90°F (305 K). What is the Carnot efficiency (in percent) of a heat engine operating between these two temperatures?  %