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To study a small insect's aerodynamics, helium was used instead of air in a wind tunnel. If flow speed remains the same as in actual scale, estimate how much the insect model size can increase and still maintain the true Reynolds number (for helium use ρ = 0.179 kg/m3, μ = 1.9 × 10-5 N s/m2).
The ball A is moving with constant velocity of 2 m/s and hits ball B. The ball B and C are at rest and they are connected with an unreformed spring with k= 100 N/m. All three balls are identical with 200 kg mass. Assume the impact between A and B is ..
If the unit step response of a system with input f(t) and output x(t) is given by, x(t) = 1 + 0.5e-2t + te-5t for all t > 0. For zero initial condition, find the differential equation relating f(t) to x(t)
incoming air flow of 200 m3h at a temperature of 20oc and a humidity ratio of 0.012 kgvkga is mixed in a chamber with
Explain how hindsight bias could affect the accident or incident investigation process. Describe the general process of the CAST technique
at t0 a disk with mass 3kg is placed on a spinning platform. the disk slides and begins to accelerate. if the maximum
The plating operation is carried out in an acid sulfate electrolyte, using a current = 20 amps for a duration = 30 min. Determine the average thickness of the plated metal resulting from this operation.
Determine the equilibrium value of h measured from the dashed position, where the spring is untwisted
if f1 110n f2 121n and f3 85n determine the magnitude and coordinate direction angles of the resultant couple
Dry Coke composed of 4% inert solids (ash), 90% carbon, and 6% hydrogen at 40C is burned in a furnace with dry air at 40C. The solid refuse at 200C that leaves the furnace contains 10% carbon and 90% inert, and no hydrogen. The ash does not react. An..
a 19th-century piston engine ran on steam. the steam supply is at 5 bar and 350oc. the steam discharges to the
What is the rotation rate (in radians per second) of 17.0 inch diameter wheels on a vehicle traveling at 211 inches per second?
A four-stroke engine has a total displacement volume of 10L, 125mm bore and 16.3:1 compression ratio. The engine produces a maximum of 210 kW at 2100 RPM. The intake air is at 45 degrees C and 22.5 g/s of air flow into each cylinder. Calculate the vo..
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