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A residential size WT has a diameter of 1 meter. Due to the size, its efficiency is only 25% of the Betz limit. What is the expected power output at a wind speed of 20 miles per hour? Assume the air density is 1.225 kg/m3.
A 15.9-kg aluminium block initially at 197 C is brought into contact with a 17-kg block of iron at 92 C in an insulated enclosure. Determine the final equilibrium temperature and the total entropy change for this process.
It is desired that the reflectivity of light at normal incidence to the surface of a trans- parent medium be less than 5.0%. Which of the following materials in Table 21.1 are likely candidates: soda-lime glass, Pyrex glass, periclase, spinel, pol..
On the street map shown in Figure 3-28, determine first if an Euler's tour is possible. Show why or why not. Then show how you would route a truck so as to achieve the least number of deadheads. You are to collect on both sides of the street at on..
what is thermal energy storage? how does it differ from thermal energy generation? what role do the terms play in a
air whose density is 0.082 lbmft3 enters the duct of an air conditioning system at a volume flow rate of 450 ft3min. if
a rigid tank which has a volume of 0.1 m3 contains 1kg of water at 100 celcius. a 3kwatt heater is energized until the
Assume that crude oil from a supertanker has density 750 kg/m'. The tanker runs aground on a sandbar. To reflect the tanker, its oil cargo is pumped out into steel barrels, each of which has a mass of 15.0 kg when empty and holds 0.120 m' of oil Y..
starting out a trip from a mountain you inflate the tires on your car to a pressure of 321kpa pi when the temperature
what is the ratio of the flowrates through the straws? Assume the drink is viscous enough to ensure laminar flow and neglect gravity.
consider a 2-d incompressible velocity field are given u ax b and v -ay cx where a b and c are constants. a check
An moles of an ideal gas A ad (1-n) moles of an ideal gas B, each at 1 atm pressure, are mixed at total constant pressure. What ratio of A to B in the mixture maximizes the decrease in the Gibbs free energy of the system?
1 a flat bottomed test tube of 200mm height and 10mm internal diameter stands on its base. it initially contains a
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