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- The drag on an airplane wing in flight is known to be a function of the density of air (), the viscosity of air(), the free-stream velocity (U), a characteristic dimension of the wing (s), and the shear stress on the surface of the wing (s). Show that the dimensionless drag, sU2, can be expressed as a function of the Reynolds number, Us.We are using simple exponential smoothing to predictmonthly electric shaver sales at Hook’s Drug Store. At theend of October 2006, our forecast for December 2006 saleswas 40. In November 50 shavers were sold, and duringDecember 45 shavers were sold. Suppose a 0.50. At theend of December, 2006, what is our prediction for the totalnumber of shavers that will be sold during March and Aprilof 2007?Suppose we got the following data during a test of a 2- stroke engine in which gas is usedas a fuel:Diameter of the piston = 149 mmStroke length = 179 mmClearance volume = 0.88 literrpm of the engine = 302Indicated mean effective pressure = 6.0 barGas consumption = 6.0 m3/hCalorific value of the gas (fuel) = 16990 kJ/m3Make a clear sketch the geometry of this engine using the data and determine thefollowing:i. Indicated power developed by the engine in watt.ii. Air Standard Efficiencyiii. Indicated thermal efficiency of the engine.
- The Antoine Equation can be used to estimate vapor pressure at various temperatures for different substances using sets of empirically-derived constants. The equation can be written as: Where for water A = 8.07131, B = 1730.63, C = 233.426, T = temperature [°C], and P = vapor pressure [mmHg]. Note that with these constants the temperature and pressure must be provided in °C and mmHg, respectively. Using the Antoine Equation and the provided constants, what atmospheric pressure (provided in terms of % of standard atmospheric pressure) will permit water to boil at 75 °C?Math, 11.11.2020 07:15, kateclaire The force-deflection relation of a steel helical spring used in an engine is found experimentally as f(x) = 200x+50x2 +10x3 where the force (f) and deflection (x) are measured in pounds and inches, respectively. If the spring undergoes a steady deflection of 0.5 in. during the operation of the engine, determine the equivalent linear spring constant of the spring at its steady deflection.Here I'm finding final kinetic energy KE2, given initial kinetic energy, initial force, alpha N/m^3 and beta N representing F(x). I integrated F(x)dx though I'm not sure how to integrate Fo with respect to X. I tried just finding the integrand ouput of 7.5x10^4m and subtracting the initial force, since the initial force would count as x=0, or I assumed. I then followed the regular approach of adding over the initial KE1 to isolate the unknown KE2 which I keeo getting as 1.07x10^10 which seems to be off. Again, I suspect where I'm going wrong is integrating the initial force -3.5x10^6N with respect to x, but other than what I've already done, that doesn't make sense to me.
- During testing of single cylinder two-stroke petrol engine following data were obtained. Brake torque = 640 Nm, cylinder diameter 21 cm, speed 350 rpm, stroke length = 28 cm, mean effective pressure = 5.6 bar, oil consumption = 8.16 kg/h, calorific value of the fuel = 42,705 kj/kg. Determine: Srake thermal efficiencyCompletely solve and box the final answers. Write legibly 4. A single stage air compressor handles 30 cubic meter per minute of atmospheric pressure, 30°C air and delivers it to a receiver at 3.0 mpa. Its volumetric efficiency is 83.0%, compression efficiency of 83.0% and mechanical efficiency of 80.30%. If it rotates at 300 rpm, what power in kW is required to drive it?The following related values of the pressure p in kN/m2 and the volume V in cubic meter where measured from the compression curve of an internal combustion engine indicator diagram. Assuming that P and V are connected by the law PVn: C, find the value of n. p 3450 2350 1725 680 270 130 V .0085 .0113 .0142 .0283 .0566 .0991
- The horizontal force due to water acting on the bolt (Fh): Fh=ρ×A1×V1×V1--V2 Fh=1000×π4×0.0752×1.254×1.254+11.286( Fh)=69.472 This is the only part I did not understand how to get. Can you please explain more? I arrived with this equation, -P1A1 - P2A2 (cancelled since atmos. Pres.) +Fh = rho A1v1 (v2-v1) Why did P1A1 disappear in your solution? How did you come up with (v1 - - v2) ? What is the control volume? Why did you not do a summation of forces is equal to change in momentum but instead go immediately to getting the horizontal force acting on the bolt?يخرج الهواء من فوهة معزولة عند 27 درجة مئوية و 100 كيلو باسكال و 150 (م / ث). إذا كانت الكفاءة الحرارية للفوهة 90٪ ، ارسم مخطط Ts لهذه العملية وحدد درجة حرارة المدخل والضغط (7، & P)؟ خذ (Cp = 1.005 و k = 1.4).Students did an experiment on Swansea University jet engine. They measured ambient temperature 16 deg C and ambient pressure 1.02 bar, engine RPM 49,042, thrust 11.1328 N, air flow 23.2031 l/s, fuel flow 6.7383 l/h, gauge combustion pressure 0.1599 bar. The temperature values (deg C) at compressor exit, turbine inlet and exhaust were recorded as 31.64, 901.75, 568.35. Assume density of fuel as 0.8 kg/L. The heating value of fuel is 42,580 kJ/kg. The idea gas constant R is 0.287 kJ/kg K, the Cp value for air is 1.005 kJ/kg K and the value of specific heat ratio k is 1.4. What is the maximum fuel (thermal) efficiency for any engine operating between the measured maximum and minimum temperature limits can achieve?