Question 1: The average cost of power in the US is 12 cents per kilowatt hour...
Please use dimensional analysis (factor label method) and show all steps Electricity in Chicago goes for about $0.06 per kilowatt hour. A kilowatt hour is just a unit of energy, like a Joule, since a Watt is a Joule per second, and a kilowatt hour is the number of Joules one would get from running 1000 Watts times one hour (3600 seconds). In the form of electricity, how much would a gigaJoule cost?
If electrical energy costs 12 cents, or $0.12, per kilowatt-hour, then what would the following events cost? (a) Burn a 100 W light bulb for 24 h straight. ______$ (b) Operate an electric oven for 6.0 h if it carries a current of 20.0 A at 220 V. ________$
If the price of electrical energy is $0.10 per kilowatt · hour, what is the cost of using electrical energy to heat the water in a swimming pool (11.0 m ✕ 8.00 m ✕ 1.5 m) from 15 to 27° C? _________ dollars
A typical cost for electric power is 10.5¢ per kilowatt-hour. (a) Some people leave their porch light on all the time. What is the yearly cost to keep a 120-W bulb burning day and night? (Round your answer to two decimal places.) (b) Suppose your refrigerator uses 485 W of power when it's running, and it runs 7 hours a day. What is the yearly cost of operating your refrigerator? (Round your answer to two decimal places.)
3. An average active person consumes about 2500 Cal (1 Cal =1000 cal) per day. (a) What is this in joules? (b) What is this in kilowatt-hours? (c) If your power company charges about 30 ¢ per kilowatt-hour, how much would your energy cost per day if you bought it from the power company? Just for fun… Do you think you could you feed yourself (adequately) on this much money per day? show work!!
1. You are in a spaceship which is moving at 7.5 x 10 m/s (one-fourth the speed of light, 0.25c) away from a star. At what speed would the light from the star pass you? What if you were moving at the same speed towards the star? 2, Energy and mass are related by the formula E doughnut that weighs 150 g into energy how many joules of energy would be released? How long could this doughnut power New York...
The average US citizen consumes 12000 kWh of electric energy per year an ‘ end use’ number and does not include the energy lost in converting other energy sources, e.g. fossil fuels to electricity. Note also that a kWh (kilowatt hour) is a unit of energy (not power) but a ‘kWh per year’ is a unit of power. The average electric bill indicates that a consumer pays about $0.12 per kWh of electric energy. Your Uncle Joe wants to get...
Question 5 (a) A electric power distributor charges residential customers $0.10 per kilowatt-hour (kWh) The company advertises that "green power" is available in 150 kWh blocks for an additional $4 per month per block. (i) A customer uses an average of 300k Wh per month and commits to one monthly 150k Wh (3 marks) (4 marks) (4 marks) block of green power, what is the annual power bill? (ii) What is the average cost per kWh using green power during...
If electrical energy costs 12 cents, or $0.12, per kilowate hour, how much does it cost to (a) burn a 100-W lightbulb for 24 h? (b) Operate an electric oven for 5.0 hifit carries a current of 20.0 A at 220 V?
11. The kinetic energy of an 80-kg object moving at 10 m/s is 2000 J 4000 J 6000 J 100 J 1000 J 12. The kilowatt-hour is a unit of speed power force momentum energy 13. Energy sources used today (in the U.S.) are, mostly, from: hydroelectric dams solar panels nuclear power stations geothermal sources fossil fuels 14. What is the velocity of a 30-kg box with a kinetic energy of 6,000 J? 64 m/s 6.0 m/s 18 m/s 20...