Engineering

5. If a pilot wants to accelerate, which forceneeds to increase?a. dragb. liftC. thrustd. weight
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What is the major disadvantage of a free running oscillator used to trigger an SCR or TRIAC
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what is the Economic
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Design a circuit that will tell whether a given month has 31 days in it. The month is specified by a 4-bit input, A3:0. For example, if the inputs are 0001, the month is January, and if the inputs are 1100, the month is December. The circuit output, Y, should be HIGH only when the month specified by the inputs has 31 days in it. However, if the input is not a valid month (such as 0 or 13) then the output is dont care (can be either 0 or 1).
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A flat site is being considered for a new school that will have a steel frame and brick faade. The steel columns will have a maximum load of 250 kips, and the planned column support will consist of a 6 foot by 6 foot square footing placed 2 feet below the ground surface (to the bottom of the footing). Subsurface conditions consist of a 15-foot-thick layer of uniform silty sand (unit weight = 122 pcf, soil modulus = 160,000 psf) over stiff clay (unit weight = 118 pcf, soil modulus = 230,000 psf). Groundwater is deep.a) Sketch the problem (freehand, not to scale) and state any necessary assumptions.b) Calculate the immediate (elastic) settlement.
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Torque is a twisting force. If the required torque applied on a 3 ft wrench is 45 ftlb, what is the force that must be applied?A) 135 lbsB) 15 lbsC) 135 ftlbsD) 15 rpm
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6. For the following waste treatment facility, chemical concentration (mg/gal) within the tank can be considered uniform. The initial chemical concentration inside the tank was 5 mg/gal, the concentration of effluent coming in is 20 mg/gal. The volume of the tank is 600 gallons. The fluid coming in rate is equal to fluid going out is equal to 60 gal/min. (a) Establish a dynamic model of how the concentration of chemical inside the tank increases over time. Specify the units for your variables. (Hint: establish a mass balance of the waste chemical. The concentration inside the tank = concentration going out) (b) Find the Laplace transformation of the concentration (transfer function) for this step input of 20 mg/gal.
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how many watts does a microwave run on
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How much work is performed if a 400 lb weight is lifted 10 ft ?40 lb/ft0.025 ft/lb4000 ftlb4000 ft/lb
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Sludge wasting rate (Qw) from the solids residence time (Thetac = mcrt) calculation. Given the following information from the previous problem. The total design flow is 15,000 m3/day. Theoretical hydraulic detention time (Theta) = 8 hours. The NPDES limit is 25 mg/L BOD/30 mg/L TSS.Assume that the waste strength is 170 mg/L BOD after primary clarification.XA=MLSS = 2200 mg/L,Xw = Xu = XR = 6,600 mg/L,qc = 8 days.Make sure you account for the solids in the discharge.What volume of sludge (Qw=m3/day) is wasted each day from the secondary clarifiers?
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Create an abstract class DiscountPolicy. It should have a single abstract method computeDiscount that will return the discount for the purchase of a given number of a single item. The method has two parameters, count and itemCost. 2. Derive a class BulkDiscount from DiscountPolicy, as described in the previous exercise. It should have a constructor that has two parameters, minimum and percent. It should define the method computeDiscount so that if the quantity purchased of an item is more than minimum, the discount is percent percent. 3. Derive a class BuyNItemsGetOneFree from DiscountPolicy, as described in Exercise 1. The class should have a constructor that has a single parameter n. In addition, the class should define the method computeDiscount so that every nth item is free. For example, the following table gives the discount for the purchase of various counts of an item that costs $10, when n is 3: count 1 2 3 4 5 6 7 Discount 0 0 10 10 10 20 20 4. Derive a class CombinedDiscount from DiscountPolicy, as described in Exercise 1. It should have a constructor that has two parameters of type DiscountPolicy. It should define the method computeDiscount to return the maximum value returned by computeDiscount for each of its two private discount policies. The two discount policies are described in Exercises 2 and 3. 5. Define DiscountPolicy as an interface instead of the abstract class described in Exercise 1.
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Problem Statement: Air flows at a rate of 0.1 kg/s through a device as shown below. The pressure and temperature of the air at location 1 are 0.2 MPa and 800 K and at location 2 the pressure and temperature are 0.75 MPa and 700 K. The surroundings are at 300 K and the surface temperature of the device is 1000 K. Determine the rate that the device performs work on its surroundings if the rate of heat transfer from the surface of the device to the environment is 1 kW. Justify your answer. Note that the flow direction for the air is not specified so you need to consider all possibilities for the direction of the airflow. Assume that the air is an ideal gas, that R
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If an older multimeter is set to display its reading in megohms, what must you do to determine the correct value? Please help.
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Consider this example of a recurrence relation. A police officer needs to patrol a gated community. He would like to enter the gate, cruise all the streets exactly once, and then leave by the same gate. What information would you need to determine a Euler circuit and a Hamilton circuit
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is sampled at a rate of to produce the sampled vector and then quantized. Assume, as usual, the minimum voltage of the dynamic range is represented by all zeros and the maximum value with all ones. The numbers should increase in binary order from bottom to top. Find the bit combination used to store each sample when rounded to the nearest integer between and (clipping may occur). Note: A partially-correct answer will not be recognized. You must answer all three correctly on the same
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Two engineers are discussing the various merits of hydroelectricity. Engineer A says that tidal barrage systems can generate electricity when the tide goes both in and out. Engineer B states marine turbines can turn slowly because the force of water is greater than the force of air. Which engineer, if either, is correct? Only engineer A is correct Only engineer B is correct Neither engineer A nor engineer B are correct Both engineer A and engineer B are correct
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If you are rejected for a promotion, you should ask for feedback so you can ________.a.Explain why you are still a better candidate than person being promotedb.Determine whether your supervisor has a personal grudge against youc.Create a professional improvement plan to address the weaknessesd.Beat yourself up over the fact that you didnt address those critiques earlier
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1. What is an op-amp? List the characteristics of an ideal op-amp
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A dead-man system should shut off fuel flow within ____ of the systems maximum flow rate.A 2%B 10%C 5%D 15%keep it simple I just need an A-D
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The asymmetric roof truss is of the type used when a near normal angle of incidence of sunlight onto the south-facing surface ABC is desirable for solar energy purposes. The five vertical loads represent the effect of the weights of the truss and supported roofing materials. The 390-N load represents the effect of wind pressure. Determine the equivalent force-couple system at A. The couple is positive if counterclockwise, negative if clockwise. Also, compute the x-intercept of the line of action of the system resultant treated as a single force R.
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An insulated, vertical pistoncylinder device initially contains 10 kg of water, 6 kg of which is in the vapor phase. The mass of the piston is such that it maintains a constant pressure of 200 kPa inside the cylinder. Now steam at 0.5 MPa and 350C is allowed to enter the cylinder from a supply line until all the liquid in the cylinder has vaporized. Determine (a) the final temperature in the cylinder and (b) the mass of the steam that has entered.
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describe a simple process
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Find a negative feedback controller with at least two tunable gains that (1) results in zero steady state error when the input is a unit step (1/s). (and show why it works); (2) Gives a settling time of 4 seconds; (3) has 10% overshoot. Use the standard 2nd order approximation. Plot the step response of the system and compare the standard approximation with the plot.
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For an Ac signal with peak voltage Vp equal to 60V, the same power would be delivered to a load with a dc voltage of
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