5. [-17.5 Points] DETAILS MOAVENIENG6 12.3.036.EP. 0/9 Submissions Used MY NOTES ASK YOUR TEACHER Consider a relatively

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5 17 5 Points Details Moavenieng6 12 3 036 Ep 0 9 Submissions Used My Notes Ask Your Teacher Consider A Relatively 1 (60.73 KiB) Viewed 16 times

5. [-17.5 Points] DETAILS MOAVENIENG6 12.3.036.EP. 0/9 Submissions Used MY NOTES ASK YOUR TEACHER Consider a relatively small house in the United States that has an annual electrical energy consumption of 3,720 kWh. Estimate the annual consumption of coal burned in a power plant to generate the required electrical energy. Assume a heating value of approximately 7.5 MJ/kg for coal, 37% efficiency at the power plant, and 6% loss for the power transmission lines. (Due to the nature of this problem, do not use rounded intermediate values in your calculations-including answers submitted in WebAssign.) What is the required energy input (in kWh/yr) to generate 3,720 kWh/year of electrical energy? kWh/year Express the required energy in joules/year. J/year Determine the amount of coal required in kg/yr. kg/year Express the amount of coal required in lbm/yr. Ibm/year Express the amount of coal required in tons/yr. tons/year Need Help? Read It Watch It 6. (-/6 Points) DETAILS WAS MOAVENIENG6 12.5.031. 0/9 Submissions Used MY NOTES ASK YOUR TEACHER A name brand 60 W CFL uses 13 watts, produces 809 lumens, and costs $4.49. As an alternative, a generic 60 W incandescent light bulb costs $0.40, produces 729 lumens, and has a service life of 750 hours. Compare the performance of each light by calculating the efficacy (in lumens/w) for each light and estimate how much it would cost to run each light for 4 hours per day for 315 days in a year. Assume electricity costs 9 cents per kWh. (Do not include the purchasing cost of the bulbs in your calculations.) CFL efficacy lumens/W incandescent efficacy lumens/ CFL cost $ incandescent cost $