A small space heater uses 1,212 Watts of power. What does it cost in dollars to use the heater for an average of 14.7 hours every day for 30 c must pay 12.3 cents per kilowatt-hour? (Enter answer with 2 digits right of the decimal. Do not enter dollar sign.)
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- How much efficiency would a solar panel of surface area A = 2 m² need to have to generate 1.4 kWh of electricity in a region where the solar power density is 4.5 kWh/m2/day? Write the efficiency in decimal value rounded off to 2 decimal places, not as a percentage. For instance you would write 0.25 and not 25%.If you expended 1500 watts for 3 hours, how many kilowatt-hours (kWh) would that be? Enter answer as number followed by a space and then the correct units (i.e "123 Unit").A retailer buys Dalmatian stuffies for $6 each. (Assume that the retailer has no other variable costs). The retailer can only charge by the dollar so no need to consider cents -- e.g., $3 is a price you could choose, $3.11 or $2.99 are not. The potential customers have the following WTP. Student (1= yes) Parent (1=yes) Cat Lover (yes =1) Over 65? (1=yes) WTP 1 $20 O $20 1 $18 1 $15 O $15 O $14 O $14 1 $14 O $14 1 $13 O $10 1 1 1 1 1 1 1 1 O $8 O $8 1 $7 1 1 $7 1 $5 O $5 1 1 1 1 $5 O $4 1 $3 1 1 1 If you can only charge a single price what is the best price to maximize revenue?
- If the average household in a region consumes about 5,250 kWh of energy per year. In the region, the average annual solar energy potential is about 1,450 kWh/m² per year. If solar panels are available in sizes of 1 m x 1 m with an efficiency of 18 %, how many panels will be needed to power a house? (Since you can't have a fraction of panel, always round up you number to the next integer.) Your Answer: AnswerHow would you solve this problem?? Thank you so much!!!Assume that it takes a net work of W to give an object a speed v and kinetic energy KE, starting from rest. What would be the object's kinetic energy (in terms ofKE) if a net work of 4.8xW to the object (again starting from rest)? We are asking how many KE's the new kinetic energy would be. If the new kinetic energy is nX KE, just enter n using one decimal place! Add your answer
- Some outdoor security lights are kept on overnight - 7 hours. They use 164 watts of power (figure out how much energy do they consume). If electricity costs $.10 per kilowatt hour, what is the electricity cost for these lights? Please include two decimal places in your answer.A 70-kg physicist is running up the stairs of the physics building and makes it up 48 m vertically in 1 minute. (a) what is the physicist's power output while running up the stairs? (b) if the physicist's work efficiency is just 3%, at what rate were they using metabolic energy? (c) if the physicist's metabolism can provide 5.6x10^6 J of energy before they need a rest, how long could they continue running up the stairs?A microwave oven has a power requirement of 1,248 W. A frozen dinner requires 5.0 min to heat on full power. (a) How much electrical energy (in kWh) is used? (b) If the cost of electricity is 11¢ per kWh, how much does it cost to heat the dinner? (Do not round your final answer. Fractional cent values are acceptable.)
- A particular frost-free refrigerator uses about 720 kWh of electrical energy per year. Express this amount of energy in joules (J). Express this amount of energy in kilojoules (kJ).On a particular day, the following appliances are used for the times indicated: a 1600-W coffee maker, 16 min, and a 1100-W microwave oven, 3.0 min. With these power requirements, find how much it costs to use these appliances at an electrical cost of 6 per kWh. (Do not round your final answer. Fractional cent values areOn a particular day, the following appliances are used for the times indicated: a 1600-W coffee maker, 19 min, and a 1100-W microwave oven, 4.6 min. With these power requirements, find how much it costs to use these appliances at an electrical cost of 7¢ per kWh. (Do not round your final answer. Fractional cent values are acceptable.)