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The population of an island was 2 million in 1950. The population grew in an exponential trend for 63 years and became 6.5 million in 2013. It is estimated that the carrying capacity of the island is 10 million. Assuming the population growth rate in the future remains the same as in the last 50 years, what will be the population of the island in 2050?
(Assume constant carrying capacity and consumption/capita.)
For fully developed laminar pipe flow in a circular pipe, the velocity profile is given by u(r) = 2(1 - r2/R2) in m/s, where R is the inner radius of the pipe. If the pipe's inner diameter is 4 cm, find the maximum and average velocities in the pip..
A rectangular channel carries a discharge of 2.00 m3/sec per meter of channel width over a weir crest that is 1.4 m in height. The energy grade line upstream of the weir measure 2.7 m above the channel bottom.
An insurance sales representative sells policies to 5 men, all of identical age and in good health. According to the actuarial tables, the probability that a man of this particular age will be alive 30 years hence is 2/3.
Two small liquid-propellant rocket motors are mounted at the tips of a helicopter rotor to augment power under emergency conditions. The diameter of the helicopter rotor is 7m, and it rotates at 1 rev/s.
a.) Determine the maximum shear stress in a rectangular beam 6 in. wide and 8 in. deep produced by a shear force of 38,400 lb. b.) For the same section and shear force conditions of part (a) above.
What impact will the type of aeration system have on a chemical dosage? What is the advantage of a plug flow system versus complete mix for a nitrifying system
Using the equation of state P(v - a)= RT, verify (a) the cyclic relation and (b) the reciprocity relation at constant v.
A full tank (3 m height) discharges water from an output pipe following the equation: W_out = A z^1/2. Calculate the time required to reduce the level to 1 m. Data: A _s = 1 m^2, A = 0.2777 kg (s m^1/2), density water = 1000 kg/m^3
If the discharge into the ocean from the estuary is q = 1.5 m3/s per meter width, determine the distances upstream from the ocean where the depth is equal to 6
where u(t) is in vehicles per minute and t is in minutes. When will the queue clear?
The piezometer A is located 4,000 ft south of piezometer B. Approximately 3,000 ft of piezometer B there is a river with an elevation relative to sea level of about 455 ft.
What is the pH value of water containing 0.005 M of an acid with a acid dissociation constant of 0.001 M. The dissociation of the acid in water can be represented as: HA H+ + A-
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