The expected time (t,) of a PERT activity in terms of optimistic time (t), pessimistic time (t,) and most likely time (t,) is given by a) te + 4t, +lp (b) te to + 4t, + t, %3D %3D 6. to + 4t, + tp to + 4t, + t,
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- 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?Calculate energy available in 17 Kg wind, if the power available at the rotor of a wind turbine is 327 kW, diameter of the rotor, D = 100 m, Air density, ρ = 1.23 kg/m3 and Power Coefficient, Cp = 0.5Need help with engineering problem. Match the RTT term with its explanation: A: ddt(∫CVβρdᏉ) B: ∫CSβρVcosθdAout C: ∫CSβρVcosθdAin A. B. C. Match one of the following answers below to each letter. A change within the control volume Outflow of B from the ontrol volume Inflow of B to the control volume
- 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?A balloon filled with helium (of density ρHe = 0.164 kg/m3 ) has a cube shape and rises through the stratosphere. Air density is given by ρ(z) = ρa exp(− gz/ RT), where ρa = 1.225 kg/m3 is the density of air at the sea level, g = 9.81 m/s^2 is the gravitational acceleration, R = 287.06 J/kg/K is the specific gas constant of air, and T is the air temperature, which is constant in the stratosphere and equal to 217 K (Note that this expression for the atmospheric density is strictly correct only in the isothermal region of the stratosphere. However, please use it for solution to this problem). This balloon is designed so that ρHe and its side length h = 30 cm remain constant for all z. The lower surface is located at z and the upper surface at z + h. Derive an expression for the buoyancy force on the balloon and compute the maximum altitude to which the balloon rises in a unit of m.The speed of sound traveling through the sea is a function of temperature, salinity, and pressure. It is modeled by the function C = 1449.2 + 4.67T -0.055T² +0.00029T³ + (1.34-0.01T) (S-35) + 0.016D where C is the speed of sound (in meters per second), T is the temperature (in degrees Celsius), S is the salinity (the concentration of salts in parts per thousand, which means grams of dissolved solids per 1000 grams of water), and D is the depth below the sea surface, in meters. Calculate the following (Check attached image d3) when T = 10 °C, S = 35 parts per thousand, and D = 100 m. Explain the physical meaning of these derivatives.
- A pump 254mm suction pipe and a 127mm discharge pipe is used to deliver 52L/s of water. The suction gage reads 15.6 kPa vacuum and the discharge gage located 100 cm above the suction gage which reads 108 kPa gage. Determine the following: a. the total dynamic head in meters 13.865 14.409 13.415 b. the water power in kW 7.831 7.348 8.245 c. the motor horsepower if the pump efficiency is 66% 15.935 14.924 13.935A work group of 5 workers in a certainmonth produced 500 units of output working 8hr/day for 22 days in the month. (a) Whatproductivity measures could be used for thissituation, and what are the values of theirrespective productivity ratios? hint (moth, day,and hours) (b) Suppose that in the next month,the same work group produced 600 units butthere were only 20 workdays in the month.Using the same productivity measures asbefore, determine the productivity index usingthe prior month as a base.An experiment is done on a single cylinder engine whose crankshaft makes two complete revolutions in every cycle and the observation data were recorded for 1 hour duration: Crankshaft revolutions =70000, Indicated mean effective pressure=38*0.7 bar, Engine swept volume=1.1 litres, Brake load on dynamometer=6kg, Brake drum diameter=37*0.8 cm, Fuel used=Diesel, Calorific value of fuel=41*0.75 MJ/kg. What percentage of indicated power is available at the engine output shaft? What will be the Indicated Specific Fuel Consumption (ISFC) in kg/kWh, if the conversion efficiency of heat released in the cylinder to indicated power is [38*0.9] %. If the conversion efficiency is less than or equal to 35%, then use [71]*0.5 % for finding conversion efficiency.
- Explain the APPROACHES TO FORECASTING?Completely 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?When using the method of repeated variables in a problem, it is determined that one of the independent Πs is given by the product between the independent variable lift force FL [N], and the repeated variables density ρ [kg/m3], velocity V [m/s], and area A [m2]. Remembering that Πs are given by the product of the primary dimensions raised to the zero power, of the type m0L0t0 T0, determine this independent Π. (the form is in the side picture)