The parameters of a 3-phase, 4-pole, 50 Hz, Y-connected, wound-rotor induction motor are listed below. These are the default values of the “Asynchronous Machine” model in MATLAB Simulink. r1=0.5968 ?; r2=0.6258 ?; L1=0.0003495 H; L2=0.005473 H; Lm=0.0354 H; Stator line voltage = 400 V rms. The motor for rotor speeds nm= 0 to 1500 rpm.

X1= 0.1097 ohm, X2= 1.719 ohm , Xm= 11.12 ohm, RTH = 0.5853 , XTH = 0.1395 and VTH = 230.82 V.

Suppose the motor is to rotate a fan for which the load torque is proportional to cube of the speed: ?m = (1.3×10^ -5 )*?m^3 where ?m is the fan speed in rad/s. Then use MATLAB to plot the torque-speed characteristic of the fan as the motor torque-speed characteristic. What would be the motor speed and torque?

*************** Please do not copy and paste from other answered questions on Chegg, *******************

QUESTION 2

The following reactions in certain anaerobic soils control the solubility of Fe2+ and Mn2+ in soil solutions:

γ-MnOOH(s) + 3H+(aq) + e- = Mn2+(aq) + 2H2O E0 = 1.457 V Fe(OH)3(s) + 3H+(aq) + e- = Fe2+(aq) + 3H2O E0 = 1.057 V

(A) Which mineral is the stronger oxidant, γ-MnOOH or Fe(OH)3?

(B) Define the redox equilibrium between γ-MnOOH(s) and Fe2+(aq) using the two half

reactions defined above. In a soil that is at equilibrium with this reaction, what is the concentration of Fe2+(aq) when the concentration of Mn2+ is 10-5 M?

(C) Calculate the Eh and pe of this soil if the pH is 7 and the Mn2+ activity is 10-5M.
(D) If molecular oxygen were introduced into this anaerobic soil system, what would be the

likely sequence of chemical processes with respect to the above reactions?

Sandra drives a bus with a wheelbase of 2.6 meters. The center of gravity is in center of the bus, 1.2 meters above the ground. You can treat the bus as if all of its mass was at its center of mass. Sandra turns right on flat ground. The center of mass has a turning radius of 47 meters. The bus moves at a constant speed V, and has a mass M. a) What is the acceleration of the bus? b) What is the total normal force on the bus? What is the frictional force? c) What is the torque on the bus about its center of mass from the force of friction? d) If all of the normal force comes from the left wheels, what is the torque on the bus about its center of mass from the wheels? e) At what speed V would these two torques be equal? f) What should Keanu do if he wants to make the turn at a slightly higher speed?

Fundamental of power electronics:

In a certain application, an unregulated dc input voltage can vary between 18 and 36 V. It is desired to produce a regulated output of 28 V to supply a 2 A load. control circuit automatically adjust D to maintain the constant output voltage and current. All ideal components.  Hence, a converter is needed that is capable of both increasing and decreasing the voltage. Since the input and output voltages are both positive, converters that invert the voltage polarity (such as the basic buck-boost converter) are not suited for this application.

(1) Sketch the waveforms of the transistor voltage Vds and transistor current IT or (Id for drain current) and give expressions for their peak values. find the numerical maximum value on the sketch for Vds and IT (Id). ignore the effect ripple.

(2) Derive the expression for switching frequency at the converter operates between the CCM and DCM at the boundary. the answer is in term of D, Vin, L1, L2, iL1, iL2. you may assume L1=L2.

A voltaic cell consists of a Pb/Pb2+ half-cell and a Cu/Cu2+ half-cell at 25 ∘C. The initial concentrations of Pb2+ and Cu2+ are 0.0500 M and 1.50 M , respectively.

Standard Reduction Half-Cell Potentials at 25 ∘C Half-Reaction E∘(V)

Cu+(aq)+e−→Cu(s) 0.52

Cu2+(aq)+2e−→Cu(s) 0.34

Cu2+(aq)+e−→Cu+(aq) 0.16

Pb2+(aq)+2e−→Pb(s) −0.13

1. What is the initial cell potential? Express your answer using two decimal places.

2. What is the cell potential when the concentration of Cu2+ falls to 0.200 M ? Express your answer using two decimal places.

3. What are the concentrations of Pb2+ and Cu2+ when the cell potential falls to 0.37 V ? Enter your answers numerically separated by a comma. Express your answer using two significant figures.

. True or false?

(1) There is at most one pivot in any row.

(2) There is at most one pivot in any column.

(3) There is at least one pivot in any row.

(4) There is at least one pivot in any column.

(5) There cannot be more free variables than pivot variables.

(6) There is a linear system that has exactly two solutions.

(7) The weights c1, ..., cp ? R in a linear combination c1v1 + ... + cpvp cannot all be zero.

(8) Given nonzero vectors u, v in R n , span{u, v} contains the line through u and the origin. Hint: can you describe this line as a set of vectors?

(9) Asking whether the linear system corresponding to a1 a2 a3 b is consistent, is the same as asking whether b is a linear combination of a1, a2, a3.

(10) If the augmented matrix of a linear system has two identical rows, the linear system is necessarily inconsistent

Analyze the following statements to see if they are true or false and then explain your answer.

A. In a two-good world, complements would have right-angle indifference curves.

B. Shepherd's Lemma explains how the Marshallian demand curves can be derived from the expenditure function.

C. If V is the indirect utility function, h is Hicksian demand and X is Marshallian demand, then h (P, V(P, I)) = X ( P, I)

D. Persons with consistent preferences exhibit diminishing marginal rates of substitution.

E. Economic models which are inaccurate descriptions of the real world are not of much use in predicting behavior of analyzing polices.

F. The Hicksian demand curve is steeper than the Marshallian demand curve.

G. A flat rate income tax could increase the work effort (hours worked) of the population compared to a graduated tax, even if everyone ended up paying more in taxes.

Question 1

U.S. homicide rates are 10 times greater than France or Germany's rates.

True

False

Question 2

Beyond injuries from gun violence, what other costs exist that are difficult to quantify?

Question 3

What was the court's decision of the McDonald, et al. v City of Chicago, et al. case?

Question 4

The City of New York v. A-1 Jewelry & Pawn, Inc. et al. case revealed two sides of an ongoing debate about whether gun manufacturers should be responsible for gun injuries.

A Mechanical design company produces an innovative design Component Z100 design of producing one(1) unit of component Z100 is provided in the bill of materials BOM which requires mix shown in Table Q3-1. The current monthly production of Component Z100 is consumption shown in Table Q3-2. Determine the following;

(i) Material usage variance;

(ii) Material price variance;

(iii) Total material cost variance;

(iv) Discuss at least two(2) importance of variance analysis in a manufacturing company

Table Q3-1

Table Q3-2

I need write in computer and all steps

A model rocket is fired vertically upward from rest. Its acceleration for the first three seconds is a(t)=96t, at which time the fuel is exhausted and it becomes a freely "falling" body. 1919 seconds later, the rocket's parachute opens, and the (downward) velocity slows linearly to −16 ft/s in 5 s. The rocket then "floats" to the ground at that rate.

(a) Determine the position function s and the velocity function v(for all times t).

(b) At what time does the rocket reach its maximum height? (Round your answer to two decimal places.)

What is that height? (Round your answer to the nearest integer.)

(c) At what time does the rocket land? (Round your answer to one decimal place.)