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Population growth in Ethiopia. In 2008, the estimated population in Ethiopia was 83 million people with a relative growth rate of 3.2%.
(A) Write an equation that models the population growth in Ethiopia, letting 2008 be year 0.
(B) Based on the model, what is the expected population in Ethiopia (to the nearest million) in 2020? In 2030?
a cam is to be disinged for an automated part loader1 rise 50mm in 1.5 sec usisng the constant velocity motin scheme.2
Air undergoes two processes in series: Process 1-2: Polytropic compression, with n = 1.3, from P1 = 100 kPa, V1 = 0.04 m3/kg to V2 = 0.02 m3/kg Process 2-3: Constant pressure process to V3 = V1 Sketch the cycle on a P-V diagram and determine the work..
A steam turbine receives a steam flow of 1.35 kg/s and the power output is 500 kW. The heat loss from casing is negligible. Calculate The change of specific enthalpy across turbine when the velocities at entrance and exit and the difference in elevat..
A plane can fly 305 mph in still air. If it can fly 185 miles downwind in the same amount of time it can fly 120 miles upwind, find the velocity of the wind.
Present an overview of (i) impact testing methods, and (ii) non-destructive testing (NDT) methods presented in your textbook. Elaborate on one type of impact testing as well as one type of non-destructive testing method. What are the advantages of us..
a heat pump heats a house in the winter and then reverses to cool it in the summer. the interior temperature should be
1 kg of air at 1.02 bar, 20°C is compressed reversibly according to a law pv 1.3 = constant, to a pressure of 5.5 bar. Calculate the work done on the air and heat flow to or from the cylinder walls during the compression.
water with a quality of 70 is contained in a cylinder with a weight on a piston that maintains a water pressure of 500
A machine of mass 400 kg operates at 1500 rpm and has an unbalanced which causes a harmonic repeated force pf magnitude 20,000 N. Design an isolation system to limit the transmitted force to 3,500 N and the amplitude of vibration during operation to ..
A cannonball is shot from a boat that's initially moving at 3 m/s in the i direction and subsequently strikes the dock at 300 m/s. The cannonball's mass is 5 kg and the boat's mass is 300 kg. Assume that for all the time that the cannonball was being..
Using the Worrell-Stessel efficiency definition, what air velocity yields the highest efficiency?
two points b and c lie on radial line of a rotating disk. the points are 2 inches apart. vb700 ftmin and vc880ftmin.
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