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mireia cisneros

mireia c.

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For the following reactions - Answer the following questions on this sheet and upload - either by scanning it on a photocopier or taking a pic. Please make sure it is legible - If I cannot read it you do not get credit! 1. Which of these will undergo a rearrangement during the reaction? 2. For reaction c-what is the nucleophile for each step of the reacton? 3. For each of the reactions a. Complete the reaction, showing the mechanism by using arrows, b. Draw the intermediate - showing the carbocation and any rearrangement needed, c. Draw and write the name of the final product. To name a compound with a halide attach - treat the halide as a substituent group, give it a number showing its placement. Bromine = bromo, Chlorine = chloro, etc... a b c HBr HCl HCl

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how to transform a square matrix into a hermit matrix, give examples.

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4. Determine the input impedance of this circuit if $R_B$ is equal to 1.5 M$\Omega$, $R_E$ is equal to 4.7 k$\Omega$, $V_{CC}$ is 12 V, $r_e$ is equal to 100 k$\Omega$, and $\beta$ is 240. ?) 1.67 k$\Omega$ ?) 3.45 k$\Omega$ C) 5.17 k$\Omega$ D) 8.50 k$\Omega$

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Let $a = 2$, $b = 4$, $c = 4$, and $f(x, y) = \frac{abx^3 y^2}{bxy^2 + ax^2 y^3}$ Find the limit $\lim_{(x,y)\to(c,0)} f(x, y)$. If the limit does not exist, then enter 999.

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18) A rectangular microstrip patch antenna is to be designed to operate in TM$_{01}$ mode at 3.5 GHz. The antenna will be designed on a FR4 substrate with $\varepsilon_r$ = 4.4 and h = 1.6 mm. a) Calculate the width and the length of the patch. b) At the main resonant frequency of the antenna, the antenna input impedance for a feed point at the patch edge is found to be 320 $\Omega$. Calculate the position of the feed point, relative to the length of the patch, required to obtain a 50 $\Omega$ input impedance.

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5. (15 Points) Computer A transmits data with Computer B through RS232C com port 1 without handshaking. Computer A as a transmitter transmits an ASCII String 'Hello world' ends with 'EXIT'(ASCII Code is 03H), to computer B. computer B as a receiver receives this ASCII String and display them on Screen. Suppose this asynchronous system requires 7 data bits, ODD parity a baud rate of 9600 bps (divisor=000CH), and 1 stop bit, 8 bytes FIFO, and uses polling way communicate with each other. "Microcomputer Principle and Interface Technology" Final Assignment Paper Page 3 Page (1) Please write an assembly code section to initialize the 16550 for Computer A. (2) Please determine how many characters can be transferred in one second? 6. (8 Points) (1)Please decide addresses for all 82C55 ports if A9-A2=10101101 is used to activate /CS. (2) Please write an assembly code section to initialize this 82C55 (mentioned in the previous question) to set all ports work on mode 0 input. 7. (12 Points) (1) What are the two subtypes of hardware interrupts? (2) Where is interrupt vector of type 60H stored? (3) How many interrupt inputs can be handled by 6 8259As which are cascaded in 1 master and 5 slaves' configuration? (4) Suppose the address of IMR in one 8259A is 21H, please write a program section to unmask(enable) IR0-IR3 but not to change other's statue.

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Prepare adjusting entries for the following: 1. On December 1, 2020, Burt Hub had signed and recorded a 5.4% bank loan for the amount of $350,000 due in 3 years. This is the only outstanding note payable. 2. Prepaid insurance in the amount of $60,000 represents a 6-month insurance policy purchased on December 1, 2020. 3. Utility costs incurred but unrecorded for the month of December were estimated to be $5,000. 4. Accrued wages totaling $60,000 were unpaid and unrecorded at December 31, 2020. 5. Unearned revenue of $24,000 represents a 12-month contract for consulting services that will be performed monthly. The payment from the customer was received and recorded on December 1, 2020.

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Ahmed & Co. makes and sells two types of shoes, Plain and Fancy. Data concerning these products are as follows: Plain Fancy Unit selling price $ 25.00 $ 36.00 Variable cost per unit 13.00 20.00 Sixty percent of the unit sales are Plain, and annual fixed expenses are $95,200. The weighted-average unit contribution margin is: a. $9.40 b. $13.60

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How large is the centrifugal acceleration (Ω^2 * r * sinθ) at the equator? Ω is given as 2π divided by the rotation period (i.e. the time for one rotation of the earth around its axis). Take r = 6371 km. Compare this to the gravitational acceleration and discuss.

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A homeowner takes out a $227,000, 20-year fixed-rate mortgage at a rate of 6.15 percent. What are the monthly mortgage payments? (Do not round intermediate calculations. Round your answer to 2 decimal places.)

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