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Hello, I have written the below queries, can somebody tell me if they are correct. manager_id in Employee Table - supervisor ; manager_id in departments table - manager. names and department names of managers who do not supervise any employee. select e.first_name|| ' ' ||e.last_name...

Also, how do I adjust the voltage on the Integral gain constant ? How much should VCONTROL be ? should it be set to 300V, and the settings on VPULSE , Are those OK ?

No, it is a closed loop system. I think the negative of the VCONTROL should go to the output of the VCAP. That should provide a feedback path. Assuming that is done. How do I adjust the gains ?

Hello Everyone, I am trying to put together a PI controller for a boost converter. Vin = 150V Vout = 300V (Require this much boost) Switching Frequency = 25KHz I am attaching a schematic in PSPICE. Please , someone, tell me if the connections are right. Also V-PULSE / SAWTOOTH = (0...

There are three steps in wallace tree : 1. AND'ing each bit. 2. Use half and full adders. 3. Adding the two outputs to an adder to get the product. What I don't understand is the reduction at each level ?

I need to construct a schematic using and gates, full and half adders for the following : Multiply two 8-bit numbers using Wallace addition structure. Can anybody help me with it. I know that sum + carry = a + b + c. At each step we reduce something. Can anyone help.

Q1. A 10,000 Micro Farad capacitor has an asymmetric tolerance specification of +20%/-50% What is the possible range of values for this capacitor? How do I do this problem ? Q2. A 15-bit A/D converter has V(full scale) = 10 V. what is the value of the LSB> If the input voltage is 6.83 V...

Q1. If j = square root of - 1 what is square root of j ? what I did was : Plug in the value of j in square root of j and came up with -1 to the power of 0.25. Is this right. Looks like this wrong. Q2. Given a complex number w = x + jy, the complex congugate of w is defined in...

Well, this is what I found : You can take a look at the attached file. Will this help us in finding the force on each bolt.

yes, the 4 bolts on the circular base are 90 degrees from each other.

I just typed out the question from the textbook as is. The sign is hanging straight up in the x - z plane. The wind blowing on the freeway exit sign and the weight of the sign are represented by point loadings acting at the center of the sign, as shown in the sketch. The force of the wind...

Q. The base of the freeway sign is attached to its foundation with four bolts.The four bolts must be able to resist the twisiting of the pole that is caused by the wind. Assume each bolt carries the same force. If the diameter of the bolt circle is 0.9m, calculate the horizontal (shear) force on...

I have a system of equations 2x + 4y - z = 2 x - y + 2z = 1 I need to find a third equation so that there is a unique solution for the unknows x , y and z, and find them. Please help Thanks,

Yes, I agree with what you are saying. The 600 N , force is actually the weight of the copying machine but, The arrow is pointing downward on the man in the picture. Also, the frictional force must act in the opposite, direction, but I described the picture "AS IS" to you from the book. Do you...

And in case you wanted to know what the answers were, F normal = 503.5 N F friction = 318.4 N ratio = 0.632

Believe Me Gokul, I shall type the entire question, from the book, and I shall describe the figure from the book to the best of my ability. Q. A man is pushing a copy machine that weighs 600 N up an incline. A free-body diagram if the man is shown in E4.6.38 a. If the net force in...

The applied force is 180 N, at 10 degrees above the slope of the incline.

Q. A Man, is pushing a copier machine, up an incline, which weighs 600 N. I need to find the frictional force, and the normal force. The free body diagram, I shall describe that to you. Weight of the machine acting downards. and if we resolve this weight we get mg sin theta along the...

For part b, that means ,change it as follows: x = (21m/s)t - 1/2 (-5 m/s^2)(t-3)^2 or change the 2nd case, equation, to x = (19m/s)(t-3) Please advise!

Q. An object starts at time t = 0 with a velocity of v0 = + 21 m/s and undergoes a constant acceleration of a = -5 m/s^2. a) How far from its starting ( t = 0 ) is the object at time at which it comes to rest? Solution: Since, the object undergoes constant acc. constant acceleration...

Can anybody help me with part d. I did: From Fn + Mg = Mv^2/R ( Fn in my case is 0.5mg) so, 0.5mg +mg = mv^2/R Cancelling the m's through out v^2 = 1.5 *9.81 / 8 = 117.72 ( Note: R is 8 in my case ) Then, a = v^2 / 2d ( d = 15m in my case ) therefore, a = 117.72 /...

Can anybody help me with part e) here please. Thanks,

Q. A heat engine cycle is executed with steam in the saturation dome. The pressure of steam is 1 MPa during heat addition and 0.5 MPa during heat rejection. THe highest possible efficiency of the heat engine is. How to calculate heat efficiency? W = QH / COP,hp and COP = 1 / ( TH...

Hi, All My question , is : Is University of Waterloo, in Canada or UIUC , University of Illinois at Urbana Champaign, IL USA , better for Electrical Engineering. ( In terms of ranking and value , quality of instruction etc. etc. ) Comments, or critcisms are welcome! Thanks,

Ok, looks like a real interesting discussion going on here. I would like 'Old Union' to elaborate on his comment "does the school matter that much when finding a job?" Are you trying to say that the school from where you graduated doesn't matter much. All you need to know is the Engineering...

Ok, found out volume flow rate what next

Ok, I agree 3 forces, but the final eqn, would it be something like this: mg + mv^2/R +Us.mg

Yes, I would like very much to limit my comments to the physics itself. And yes, thank you very much for looking through the whole problem. I certainly would not be interested in how you would relate to, but please certainly don't give a negative impression. I know that this is a forum...

Force of gravity and Normal force, what else can it be?

Well, yes I understand my mistake ( a serious one maybe ), but 'OlderDan' you need to tone down, your disagreement, and try to be softer at times if not always. Well can't complain, since this is a free forum, and with 'Older ppl' I can understand that, it happens with them.

Well, do you have a sample problem you have trouble understanding with... If so post it.

Q. What do most Electrical Engineers do typically in the real world? i.e what kinds of jobs do they hold? What kind of jobs can EE major's do with a bachelor's degree? Do they deal with circuits all the time in their careers? Answers, ideas or criticisms appreciated.

Q. A chemistry student with a mass of 75 kg is riding a steadily moving Ferris wheel. When she is at the top of the Ferris wheel, the normal force from the seat on to her body has a magnitude of 556 N. Q. What would the normal force be on the student at the top of the wheel if the wheel's...

Q. A biology student rides her bike around a corner of radius 24 meter at a steady speed of 8.3 m/sec. The combined mass of the student and the bike is 87 kg. The coefficent of static friction between the bike and the road is μs = 0.39. What is the magnitude of the total force between the...

Q. The air in a 6m x 5m x 4m hospital room is to be completed replaced by conditioned air every 20 min. If the average air velocity in the circular air duct leading to the room is not to exceed 5 m/s, determine the minimum diameter of the duct. We can figure out the volume of the room...

Q. A 2-m3 rigid tank contains nitrogen gas at 500kPa and 300 K. Now heat is transferred to the nitrogen in the tank and the pressure of nitrogen rises to 800 kPa. The work done during this process is ... Do we need to use W = P2v2 - P1v1/ ( 1-n) Some guidance requested please. Thanks,

A biology student rides her bike around a corner of radius 24 meter at a steady speed of 8.3 m/sec. The combined mass of the student and the bike is 87 kg. The coefficent of static friction between the bike and the road is μs = 0.39. a) If she is not skidding, what is the magnitude of the...

Q.Suppose the moon were held in its orbit not by gravity but by the tension in a massless cable. You are given that the period of the moon's orbit is T = 27.3 days, the mean distance from the Earth to the moon is R = 3.85 x 108 m, and the mass of the moon is M = 7.35 x 1022 kg...

I know part c. once I find part b.

Force due to gravity while in air , and on contact the balls acceleration. Ft = mv know m , v ... but don't know time

Thanks, whozum, I finally got them all.!

Yup I got it thanks!

Suppose you were given \lambda^{2}+9=0 How would factor it , in order to find the two values for [tex] \lambda

Can somebody explain how they arrived at \lambda^{2}+9=0 I know that the two roots are 3i and -3i. I had figured out this already.

My thought is to compute the wronskian: and see if it is equal = 0 it is dependent, if not independent.

My thought is to compute the wronskian: and see if it is equal = 0 it is dependent, if not independent.

Ok, Let us give up technology for a moment ,and actually think , how to solve this problem analytically using calculus. I know we could use Euler's Method or Linear Approximation, but how do we apply them analytically .. How to get started? Please help!

Yeah, I think you are right, Euler's Method would work definetly. How about using calculus. any ideas. I can make a 'spreadsheet' in Excel that can calculate the differential at the specified point using Euler's Method and Euler's Improved method. But any ideas on how to actually...

Q. Determine a homogeneous linear differential equation with constant coefficients having having the following solution: y = C1sin3x + C2cos3x My idea is to differntiate both sides with respect to x and come up with an equation in dy/dx what else? can be done... Is my idea correct.

Q. { x^2 + x + 2 , x^2 -3x + 1, 5x^2 -7x + 7 } Prove wether or not the above function's are linearly dependent. Any help shall be very helpful!