Numerade

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1. (6') Use properties of phasors (complex numbers) to calculate the following: $$\bar{V}_1 + \bar{V}_2$$ $$\bar{V}_1 - \bar{V}_2$$ $$\bar{V}_1 \cdot \bar{I}_1^*$$ $$\bar{V}_1/\bar{I}_1$$ $$V_1 \cdot I_1$$ $$V_1/I_1$$ $$v_1 = 10 \cos(1000t + 30^\circ), v_2 = 3 \cos(1000t + 60^\circ), i_1 = 2 \cos(1000t - 10^\circ)$$

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An association of workers who organize to improve their economic status and working conditions is called: Question 10 options: a union a multi-national a commune a social movement

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12 11 10 9 8 7 6 5 4 3 2 1 0 Time Slept (Hours) Mon Tues Wed Thurs Fri Sat Sun

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True or false? Two pulses identical in form, but inversely shaped, travel toward each other. According to the superposition principle, the two pulses will cancel each other. After interference, both the pulses will disappear. Select one: True False

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Give the equation of the oblique asymptote, if any, of the function. g(x) = (x + 8)/(x^2 - 16)

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(a) Consider a dual-mode system in which the kernel is separated from user-level applications using two "rings of protection". • (4 points) Is it safe for the kernel to directly access user-level memory in any process address space? Briefly explain your answer. • (6 points) Is it safe for the kernel to directly execute user-level code in any process address space? Again, briefly explain your answer. • (8 points) Systems such as UNIX allow processes to associate signal handlers with various events. Unlike interrupts, signals are not handled until the target process is active. Briefly explain one CPU, memory and I/O protection problem if we allowed a signal handler for process $p1$ to execute in the context of another process, $p2$. If we could address these protection problems, what would be the advantage of this scheme?

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Journalize, post, and prepare a partial income statement. (LO 2, 3, 5) P5-28 Copple Hardware Store completed the following merchandising transactions in the month of May. At the beginning of May, the ledger of Copple showed Cash of $5,000 and Share Capital-Ordinary of $5,000. May 1 Purchased merchandise on account from Nute's Wholesale Supply $4,200, terms 2/10, n/30. 2 Sold merchandise on account $2,300, terms 1/10, n/30. The cost of the merchandise sold was $1,300. 5 Received credit from Nute's Wholesale Supply for merchandise returned $500. 9 Received collections in full, less discounts, from customers billed on sales of $2,300 on May 2. 10 Paid Nute's Wholesale Supply in full, less discount. 11 Purchased supplies for cash $400. 12 Purchased merchandise for cash $1,400. 15 Received refund for poor quality merchandise from supplier on cash purchase $150. 17 Purchased merchandise from Sherrick Distributors $1,300, FOB shipping point, terms 2/10, n/30.

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Question 30 17 Points Lysozyme is a natural antibacterial agent found in tears and egg whites. Lysozyme catalyzes the reaction to cleave the ($\beta\;1\rightarrow4$) glycosidic C-O bond between the two types of sugar residues of peptidoglycan, the carbohydrate found in many bacterial cell walls. The key catalytic amino acid residues in the active site are Glu-35 and Asp-52. The reaction follows the $S_N2$ mechanism, and is shown in the figure below: Based on the mechanism, answer the following questions: (a) What are the protonation states for Glu-35 and Asp-52, respectively, at the active site? (2 pts) (b) In the first catalytic step, what is the nucleophile, and what electrophilic center does it attack? Explain in one sentence or two. (3 pts) (c) In this step, what catalytic strategies are Glu-35 and Asp-52 involved, respectively? Explain how you can tell. (4 pts) (d) How is the covalent intermediate displaced in the second step? What is the nucleophile in this step? What catalytic strategy is Glu-35 involved in this step? (4 pts) (e) According to your analysis of the catalytic mechanism, what do you expect a mutation of Glu-35 to Gln may affect the enzyme activity? Explain your reasonings. (4 pts)

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def binary_search(alist, target): return binary_search_0(alist, 0, len(alist)-1, target) def binary_search_0(alist, low, high, target): if low > high: return False else: mid_idx = (low+high)//2 mid_element = alist[mid_idx] if mid_element == target: return True elif mid_element > target: answer = binary_search_0(alist, low, mid_idx-1, target) return answer else: answer = binary_search_0(alist, mid_idx+1, high, target) return answer print(binary_search([2, 6, 9, 10, 12, 13, 15, 16], 14)) (b) Draw a memory diagram that shows what memory looks like right before line 2 is executed. (c) Draw a memory diagram that shows what memory looks like right before line 5 is executed for the first time. (d) Draw a memory diagram that shows what memory looks like right before line 5 is executed for the second time. (e) How often is line 5 going to be executed in total? And what are the values for low and high for each time that line 5 is executed?

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Suppose that $2 \le f'(x) \le 5$ for all values of $x$. What is the minimum possible value of $f(6) - f(1)$?

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samuel i.