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Which of the following statements is true about the Tuskegee Syphilis study? A It had nothing to do with medical experiments, and no treatment was offered. B There was no informed consent from the participants. C The contagious nature of the disease was never made known to the families. D Diagnostic spinal tabs (back shots) were misinterpreted as special free treatment when in actual sense, they withheld treatment. E All the statements are true.

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Problem 3 A 7200 / 12,470 V wye-connected feeder serves a peak load of 7000 kVA at a lagging power factor of 0.8 connected at the end of the feeder. The minimum daily load is approximately 3000 kVA at a power factor of 0.85. If the total impedance of the threephase feeder is 0.55 + j1.30 Ω, determine the following: a) The necessary kvar rating of the shunt capacitors located at the load to improve the peak-load power factor to 0.95 b) The reduction in kVA and line current due to the capacitors at peak load c) The effects of the capacitors on the voltage drop on the feeder at peak load d) The reduction in kVA and line current due to the capacitors at minimum load e) The effects of the capacitors on the voltage drop on the feeder at minimum load f) The power factor at minimum daily load level g) Assuming the utility has a rule of thumb that fixed capacitors should be sized to correct the minimum load power factor to 0.95, and then switched capacitors should be employed to correct the peak load power factor to 0.95, what is the kvar split between fixed and switched capacitors to achieve the needed kvar of shunt capacitors found in a) above?

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A cube will increase in ______ when heated: area length mass volume

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4. A metal strip of length L and thickness d is moving with speed v through a region of a uniform magnetic field of magnitude B perpendicular to the direction of the velocity of the strip. The magnetic field goes into the page as shown. A voltage $V_H$ is measured between the points A and B of the strip. (a) Which end A or B has a higher voltage? (b) Calculate the speed v of the slab in terms of L, d, B, $V_H$ as necessary. (c) Does your result depend on the magnitude or the sign of the charges which make up the metal strip? Discuss.

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A square loop of wire with side length, a, carries current I. What is the magnetic field at point P, located a horizontal distance x/2 to the left of the loop?

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Ubiquinone transports two electrons through the hydrophobic core of the inner mitochondrial membrane where the electrons are released at Complex III using the Q-cycle. What benefit(s) does the Q-cycle provide that would not be possible If the electrons were directly transferred from UQ/UQH2 to Complex III? ? Without the Q-cycle the electron transport chain and Oxidative Phosphorylation of ADP to form ATP would be decoupled. ? It facilitates transport of electrons from Succinate dehydrogenase ? The Q-cycle facilitates the pumping of 4 protons per pair of electrons transferred, otherwise only 2 protons would be pumped by Complex III ? The Q-cycle contributes electrons to cytochrome c. ? It facilitates transport of electrons from NADH dehydrogenase ? The Q-cycle promotes O2 binding at Cytochrome c Oxidase.

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Problem 1: Density matrix for partially polarized light A beam of light travels in the z-direction. Define the basis states $|x\rangle = \begin{pmatrix} 1 \\ 0 \end{pmatrix}; |y\rangle = \begin{pmatrix} 0 \\ 1 \end{pmatrix}$, (1) (i) Construct the density matrix $\rho$ and its square $\rho^2$ in this representation; (ii) by checking whether $\rho^2 = \rho$ determine whether $\rho$ represents a pure or a mixed state in each case; and (iii) find $\rho$ in the representation in which it is diagonal, for the following situations: a) the $x$-polarized state; b) the $y$-polarized state; c) a state linearly polarized at 45°, i.e. the state $|45^\circ\rangle = (|x\rangle + |y\rangle)/\sqrt{2};$ d) a state linearly polarized at 135°, i.e. the state $|135^\circ\rangle = (|x\rangle - |y\rangle)/\sqrt{2};$ e) a right-circularly polarized beam, i.e. the state $|R\rangle = (|x\rangle + i|y\rangle)/\sqrt{2};$ f) a left-circularly polarized beam, i.e. the state $|L\rangle = (|x\rangle - i|y\rangle)/\sqrt{2};$ g) a beam that is a mixture of 50% $x$-polarized and 50% $y$-polarized; h) a beam that is a mixture of 50% 45°-polarized and 50% 135°-polarized; k) a beam that is a mixture of 50% right and 50% left circular polarization; l) a beam that is a mixture of 33% $x$-polarized, 33% 45°-polarized, and 33% right-circularly-polarized.

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March 27, 2019 Be given for correct answers if no work is showed. 1) Infrared spectroscopy has a region that is typically not interpreted. What is the region's name? 2) Express the energy in the expression below as a function of wavelength $E = h\nu$ 3) Why is KBr used as a matrix to prepare IR samples? 4) A polymer has the IR spectrum below. Given the frequencies in the table below, which is the polymer corresponding to this spectrum? B). H PMMA A). C). H HH H 1 D). None of the above HHHH Bond C-O Table 10.1 Typical vibrational frequencies of functional groups Molecule Wavenumber (cm$^{-1}$) 1300 - 1000 C=O Alcohols, ethers, esters, carboxylic acids, etc. Aldehydes, ketones, esters, carboxylic acids Amides 1750 - 1680 C=O 1680 - 1630 N-H (Stretching) Amines and amides 3500 - 3100 -N-H (Bending) Amines and amides O-H Alcohols C-N Amines S-H Mercaptans 1640 - 1550 3650 - 3200 1350 - 1000 2550

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PROBLEM 1 You will implement and test an application that acts as main-memory database containing information about cricket matches. All the records with cricket matches information will be stored in a Sorted-Circular Doubly-linked list container class. The insertion of each match record will be based on the match id and its league number. For example: PSL1-1, PSL1-4, PSL2-1. The following diagram illustrates a general level organization of a cricket match database for these three matches, when inserted in that order PSL2-2 next prev 0 next prev PSL1-4 Next Prev PSL1-1 Next Prev In reality, each node will not have simply the match id, but a record that has the following information: 1. Match ID 2. Team 1 3. Team 2 4. Match Date 5. Winner 6. Location You will implement the following operations for the cricket matches database application 1. Add match - add a new match record to the cricket matches database. You cannot insert the cricket match which already exist in the list. 2. Delete match - deletes a cricket match record from the cricket match database. 3. Find match - finds the information record for a cricket match 4. Print match in order - prints all the cricket match in the list sorted order. NOTE: You must keep the movies in sorted order at all times

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Evaluate the following integral $\int_0^{\pi/2} (8 + 4\cos x) dx$ using Trapezoidal composite rules (n=5) Choices 16.5776 -16.5776 16.5334 None

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richard a.