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A 25-W compact fluorescent lightbulb (CFL) produces the light equivalent of a 100-W incandescent bulb. The population of North America is estimated to be about 305 million. Estimate the amount of coal needed to light one 100-W incandescent lightbulb for each person for one year and the amount of coal that would be saved if each incandescent bulb were replaced with a CFL. Assume the coal has a NHV of 28.5 MJ/kg and the power plants are 33% efficient.
What difference does the tightening of bolt in the friction grip joint make to the load at first slip and the failure load.
The frame shown is used to support high-tension wires. If W = 200 lb, b = 3 ft, a = 30°, what is the axial force in member HJ?
The natural water content of a saturated soil is 41% and its shrinkage limit = 20%. Gs (sp. gravity of solids) = 2.75. Calculate the percentage change in volume based on its volume at its natural water content if the soil is dried to a water conte..
Two sites are being considered for wind power generation. In the first site, the wind blows steadily at 7 m/s for 3000 hours per year, whereas the second site the wind blows at 10m/s for 2000 hours per year
The rod is made of a-36 steel and has a diameter of .25 in. if the springs are compressed 0.5 in when the temperature of the rod is T=40F, determine the force in the rod when its temperature is T=160 F.
What would be the resistance on a level road. What horsepower must be delivered to the wheels on the grade? If the efficiency is 80%, what must be the rated horsepower of the motor.
The tank contains water to depth of 2m and oil (SG=0.8) on top of the water to a depth of 1m. Determine the magnitude and location of the resultant force acting on one end of the tank (i.e. 3m high by 3m wide).
Determine the uniform flow depth in a rectangular channel 2.5 m wide with a discharge of 3 m3/s. The slope is 0.0004 and Manning's roughness coefficient is 0.015
A line passes through the points (22 m, 19 m) and (-2 m,-5 m). determine the perpendicular distance d from the line to the origin O of the system of coordinates.
The uniform 25 kg plate is welded to the vertical shaft, which is supported by bearings A and B. Calculate the magnitude of the force supported by bearing B during application of the (M =) 140 N·m couple to the shaft.
Why is granular activated carbon(GAC) used to treat the industrial wastewater stream but not the domestic wastewater stream
Air at the turbine inlet is at 700 kPa and 25 degree C. The turbine discharges air in to the atmosphere at a temperature of 11 degree C. Inlet and outlet air velocities are 100 m/s and 2 m/s respectively.
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