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albert clark

albert c.

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There are four cis, trans isomers of 2-tert-butyl-5-methylcyclohexanol, where the cis, trans designations of the substituents are made relative to the OH group. CH3 5 1 OH H3C CH3 CH3 (a) Using a planar hexagon representation for the cyclohexane ring, draw structural formulas for the four cis, trans isomers. (Do this on paper. Your instructor may ask you to turn in this work.) (b) Draw the more stable chair conformation for each of your answers in part (a). (Do this on paper. Your instructor may ask you to turn in this work.) (c) Of the four cis, trans isomers, which is the most stable?

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The most common cause of otitis media and meningitis is: Group of answer choices Streptococcus pneumoniae Staphylococcus aureus Escherichia coli Clostridium perfringens

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Suppose that α/2 is an angle in quadrant 1 and that cos α = 41/841. Compute the exact value of sin(α/2). What does sin(a/2) equal?

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Texts: Canine retinal degeneration is an X-linked recessive trait in dogs. Rex, a male dog, has X-linked retinal degeneration. Neither of his parents are affected. Rex’s mother has an unaffected mother and an affected father. Rex’s father has an affected mother and an unaffected father. A. In the space below, draw a pedigree to describe these dogs. Shade the symbols of dogs affected by X-linked retinal degeneration. B. Of the four dogs in the first generation (the grandparents), circle the one that is the source of Rex’s disease.

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Remember the continuous-time LTI system whose step response is given by s(t) = e^(-t)u(t). y(t) = e^(-(t-1))u(t - 1) - e^(-(t-3))u(t - 3) Now, by completing the following solution, verify the above response. y(t) = x(t)*h(t) ∗ ∫[u(t -1) - u(t -3)][-e^(-(t-t))u(t -t) + e^(-t)]dt = ..

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4. Consider the Diesel cycle diagrammed below (Figures from Schroeder). You will derive the efficiency assuming the working fluid is an ideal gas. Pay careful attention to the signs of Q and W. The four stages consist of a) Compression: 1?2, an adiabatic compression from $V_1$ to $V_2$, b) Ignition: 2?3, an isobaric (constant pressure) volume increase from $V_2$ to $V_3$, c) Power stroke: 3? 4, an adiabatic expansion from $V_3$ to $V_1$, and d) Exhaust: 4? 1, an isochoric pressure decrease from $P_4$ to $P_1$. $P_4$ $P_2$ 2 3 $P_1$ $V_2$ $V_3$ $V_1$ V Hot reservoir, $T_h$ $Q_h$ Engine $Q_c$ Cold reservoir, $T_c$ W a) Use conservation of energy to write the efficiency of the engine in terms of only $Q_c$ and $Q_h$. Identify the stages in the Diesel cycle where $Q_c$ and $Q_h$ are nonzero. (3 points). b) How much work is done on the working fluid during ignition (note in a diesel, the piston moves during ignition in such a way as to maintain constant pressure)? Express your answer in terms of convenient P's, V's, and f, as needed. (3 points)

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Evaluate the indefinite integral.\\ $\int \frac{(\ln(x))^3}{x} dx$ \\ We must decide what to choose for $u$. \\ If $u = F(x)$, then $du = F'(x) dx$, and so it is helpful to look for some expression in $\int \frac{(\ln(x))^3}{x} dx = \int (\ln(x))^3 (\frac{1}{x}) dx$ for which the derivative is also present, though perhaps missing a constant factor.\\ For example, $\ln(x)$ is part of this integral, and the derivative of $\ln(x)$ is $\frac{1}{x}$, which is also present.

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A common type of reference electrode comprises of silver and silver chloride, immersed in an aqueous solution of potassium chloride (Ag|AgCl|KCl). a) Why is a reference electrode required in many electrochemical experiments? b) In the case of the silver-silver chloride reference electrode, the equilibrium can be written as Ag + Cl- = AgCl + e-. Write down the Nernst equation for the reaction of Ag/Ag+ redox-reaction in the absence of chloride ions, using the standard reduction potential EAg+|Ag0=0.800 VSHE. c) AgCl is poorly soluble in water and the activities of silver and chloride ions are related through the solubility product K = a(Ag+) · a(Cl-) = 1.76 · 10-10. Make use of this to rewrite the Nernst equation from (b) as a sum of a constant term and a term depending on the chloride activity a(Cl-). d) At room temperature and in a saturated KCl solution, a(Cl-) ≈ 2.7. What is the reversible potential of the silver-silver chloride reference electrode in that solution?

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What are the advantages and disadvantages of the Mondragon Cooperative Council system?

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You have a 25-year-old female patient with the following symptoms: eyelid droop, double vision, and muscle weakness in the arms and legs. The patient has a series of tests that confirm this patient has the disease myasthenia gravis. Your patient wants to know how they are different from a normal, healthy person. You correctly tell the patient that compared to a normal person, a person with myasthenia gravis has _______________ at the neuromuscular junction. A) larger amplitude (more depolarization) end plate potentials B) more inhibitory end plate potentials (more hyperpolarization at the motor end plate) C) fewer functioning ACh receptors than normal on skeletal muscle cells D) smaller amplitude (less depolarization) end plate potentials E) C and D One test used to help confirm a diagnosis of myasthenia gravis is an "anticholinesterase test" and the drug Tensilon (edrophonium) is most commonly used for this test. In this test, the patient is given Tensilon, a drug that inhibits acetylcholinesterase (it is a short-acting acetylcholinesterase inhibitor). Which result would indicate the patient has myasthenia gravis? A) increased muscle weakness during the anticholinesterase (Tensilon) test B) decreased muscle weakness during the anticholinesterase (Tensilon) test Being a great healthcare provider, you know that during the "anticholinesterase test" a ___________ in heart rate occurs in some patients that you should be prepared for, and therefore, you should have ___________ available in case that occurs. A) increase, atropine B) decrease, acetylcholine C) decrease, beta-1 antagonist D) decrease, atropine E) increase, beta-1 agonist You write a prescription for the drug neostigmine for this patient you have diagnosed with myasthenia gravis. Could a side effect of neostigmine treatment be overactivity of muscarinic receptors causing increased gut motility, diarrhea, and excess salivation? A) yes, it makes sense B) no, it does not make sense

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