Enter your answer in the provided box. Calculate the electricity cost to charge a Tesla Model S vehicle with a 86.0-kWh battery capacity. The electricity cost in your area is 11¢/kWh. $

.  Most people find waterbeds uncomfortable unless the water temperature is maintained at about 85 °F. Unless it is heated, a waterbed that contains 892 L of water cools from 85 °F to 72 °F in 24 hours. Estimate the amount of electrical energy required over 24 hours, in kWh, to keep the bed from cooling. Note that 1 kilowatt-hour (kWh) = 3.6 ×× 106 J, and assume that the density of water is 1.0 g/mL (independent of temperature). What other assumptions did you make? How did they affect your calculated result (i.e., were they likely to yield “positive” or “negative” errors)?

Most people find waterbeds uncomfortable unless the water temperature is maintained at about 85 °F. Unless it is heated, a waterbed that contains 892 L of water cools from 85 °F to 72 °F in 24 hours. Estimate the amount of electrical energy required over 24 hours, in kWh, to keep the bed from cooling. Note that 1 kilowatt-hour (kWh) = 3.6 × 106 J, and assume that the density of water is 1.0 g/mL (independent of temperature). What otherassumptions did you make? How did they affect your calculated result (i.e., were they likely to yield “positive” or “negative” errors)?

Recycling aluminum consumes 95% less energy than refining the ore. Consider a material that requires a total energy of 100 kWh for refining. If recycling requires 95 % less energy compared to refining, the same mass of material can be recycled using 5 kWh of energy because 100 kWh – 95 kWh = 5 kWh. The 95 kWh is the energy saved. About 17 kWh of electricity is required to refine 1.0 kg of aluminum from its ore (17 kWh/kg). How many million kWh of energy is saved if a plant recycles 90 million kg of aluminum? Express your answer numerically to two significant figures in million kWh. Since the units are million kWh, you may skip multiplying by 10°.

Consider two coal-fired power plants that generate 5 x 1012 J of electricity daily. Plant A has an overall net efficiency of 38%. Plant B, a proposed replacement, would operate at higher temperatures with an overall net efficiency of 46%. The grade of coal used releases 30 kJ of heat per gram. Assume that coal is pure carbon. a. If 1000 kg of coal costs $30, what is the difference in daily fuel costs for the two plants? b. How many fewer grams of CO2 are emitted daily by Plant B, assuming complete combustion?

The sun supplies about 1 kilowatt(s) of energy for each square meter of surface area (1 kW/m2kW/m2, where a watt = 1 J/sJ/s). Plants produce the equivalent of about 0.19 gg of sucrose (C12H22O11C12H22O11) per hour per square meter.

A serving size of six cookies contains 6 g of fat, 23 g of carbohydrates, and 9 g of protein. If walking 1 mile consumes 170 kJ of energy, how many miles must you walk to burn off enough calories to eat six cookies? Assume the energy content of fats, carbohydrates, and proteins are 8 kcal/g, 4 kcal/g, and 4 kcal/g, respectively. 1 cal = 4.184 J.

A serving size of five cookies contains 9 g of fat, 16 g of carbohydrates, and 2 g of protein. If walking 1 mile consumes 170 kJ of energy, how many miles must you walk to burn off enough calories to eat five cookies? Assume the energy content of fats, carbohydrates, and proteins are 8 kcal/g, 4 kcal/g, and 4 kcal/g, respectively. 1 cal = 4.184 J.

A company pays the electric company at a rate of $0.18 per kilowatt-hour for their power. The factory uses three ventilator fans to keep the workers safe from dust. Each fan has a 1 horsepower motor. The company runs the fans continuously 24/7. How much is the company’s energy cost per month (30 days) to operate the ventilation system?

A serving size of eight cookies contains 7 g of fat, 17 g of carbohydrates, and 8 g of protein. If walking 1 mile consumes 170 kJ of energy, how many miles must you walk to burn off enough calories to eat eight cookies? Assume the energy content of fats, carbohydrates, and proteins are 8 kcal/g, 4 kcal/g, and 4 kcal/g, respectively. 1 cal = 4.184 J.