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Compact fluorescent light (CFL) bulbs have been avaiable for years; they are bery efficient but a little pricey. A CFL bulb that puts out as much light as a 60-W incandescent bulb might costs $10, compared to about $1 for the incandescent bulb. But CFL bulbs are expected to last (on average) 15,00 hours, compared to about 1000 hours for an incandescent bulb. so it is easy to say that you would meed 15 incandescent bulbs (total cost $15) to last the 15,000 hours that you would get from one ($10) CFL bulb; you save $5 and a lot of climbing ladders to replace all those incandescent bulbs.
But theres more. A CFL bulb that puts out as much light as a 60-W incandescent bulb will use about 13W or power. according to the US Energy Information Administration, residential electricity costs average about $0.10 per kilowatt/hour (1kQ/h=3600 kW/s=3600 kJ). Over the 15,000 hours that one CFL bulb is expected to last, how much will you save on power if you replace an incandescent bulb in your home with a CFL bulb.
Find the Total energy cost and savings from using both CFL bulbs and incandescent bulbs.
The car was travelling on a 3% upgrade on a pavement with friction factor of 0.30. How much further would the car have skid if it did not strike the concrete barrier?
how much money should timothy and tiffany deposit annually for 20 years in order to provide an income of $30,000 per year for the next 10 years. Assume the interest rate is a constant 4%
Complete mixed system that contains a single reactor against a system that contains three Complete Mixed reactors of equal volume in series. (total volume of three reactors should be equal to the single reactor)
Whether the wall has adequate sliding resistance and whether the wall is safe against over-turning
a 9in radius cylinder of weight 18lb rests on a 6lb carriage. the system is at rest when a force p of magnitude 2.5 lb is applied ( p is coming out of the car the cylinder is sitting on and going to the right) for 1.2s.
A subsurface detention basin is installed beneath a street to help prevent flooding. Water from the rain is chanelled into the basin and begins to infiltrate into the ground when it reaches 1ft.
A torque of magnitude T = 1000Nm is applied at D as shown. Knowing that the diameter of shaft AB is 56 mm and that the diameter of shaft CD is 42 mm, determine the maximum shearing stress in (a) shaft AB, (b) shaft CD.
a rectangular prism box which is floating on water has a length L =1200mm, breadth = 800mm, height = 500mm and mass of 52kg. when the box is loaded with the suspended hexagonal mass, its immersion is 300mm, and when it the mass is placed inside th..
A person produces about 0.17 pounds of BOD per day in fecal waste. What is the population equivalent of the wastewater flow Based on this calculated population, what would the average daily wastewater production be per person
a regular hexagonal pyramid has an upper base edge of 16 ft. and a lower base edge of 28 ft. if the volume of the frustum is 18041 ft^3., find the lateral area of the frustum.
Water enters a pipe at 100 psig and 70 degrees F. The density of water under these conditions is 62.3 lbm/ft^3. The pipe has an inside diameter of 4.5 inches. The mass flow rate of the water is measured to be 7500 lbm/hr.
A telephone wire 5 mm in diameter is suspended between telephone poles spaced 50 m apart. If the wind velocity is 100 km/h and the air is at 2 degrees C, 1 atm, determine the horizontal force (in N) the wire exerts on the poles.
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