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For assistance with (but not answers to) homework problems.

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A simple reminder to all: this is the "Homework Help" forum, not the "Homework Answers" forum. We will not do your work for you, only point you in the right direction. Posts that do give the answers may be removed.

  1. Started by Science Student,

    Here's my attempt at the answer to the following question: Question: Use induction to prove that 3^n > n x 2^n for every natural number n ≥ 3 Answer: Step 1: 3^3 > 3 x 2^3 ⇒ 27 > 24 Step 2: Assume 3^k > k x 2^k Step 3: 3^(k+1) > (k+1) x 2^(k+1) ⇒ 3 x 3^k > k x 2^(k+1) + 2^(k+1) ⇒ 3^k + 3^k + 3^k > k x 2^k + k x 2^k + 2^k + 2^k. So am I allowed to use the assumption as a given to make the green and red parts of the inequality true? And am allowed to just plug in the base k value that would show the black parts of the inequality to be true? Another thing that I don't understand about induction is why we have to ass…

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  2. Hello, I need help on this topic as I am new to the field of Biotechnology. If anyone knows any articles on thiis topic: Fermentative Production of Ethylene & Propylene Glycol, kindly send me links of them. Thank you.

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  3. It is said that, " A kilogram of antimatter, annihilating with ordinary matter, can produce ten billion times the amount of energy released when a kilogram of TNT explodes." I'm attempting to figure out how much antimatter it would take to propel a ~800 kg object through space at 11 miles per second, for 20 light years. I've a very limited knowledge of E=mc2 and would appreciate a simplified explanation as to how I would even go about answering this problem and which formulas I would need. Thanks very much for any help

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  4. My teacher gave us an equation: nhcoohdeltaHhcooh+oh + nh30deltaHh30+oh = -(CcaldeltaTcal + cwaterVaciddeltaTacid + cwaterVbasedeltaTbase) & told us to find enthalpy of neutralization fo formic acid. given: hcooh + oh----h2o + hcoo h30+oh----2 h2o hcooh: t1=21.4, t2= 27.5, delta T=6.1 (* this was also the delta Tcal) naoh: 20.4, t2= 27.5 , delta T= 7.1 This is the information I calculated: 1. initial moles - nh30= 0.0632 (0.075mol - 0.011748mol) (which my teacher said to use the equation above with. We had to interpolate deltaHhcooh+oh ( which = -58517) However, I plugged in the values and got -57474.58. Please help. (* how to do the proper p…

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  5. Started by RossHeaton,

    Im writting about the synthesis of human serum albumin for my biology assignment, but I am having trouble finding clear infomation on its structure. So my questions are: How many polypeptide chains make up the HSA protein? How are the polypeptide chains bonded together? What are the domains and sub domains I keep reading about? Thankyou in advance for any infomation.

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  6. Started by h2o91,

    Hey all, just had some difficulty understanding these statements. Was wondering if I could get some help. Thanks. True or False? 1) Enzymes exhibit high stereospecificity, even on prochiral substrates, for example,distinguishing between different hydrogens on the same carbon of NAD(P)H. 2) Enzymes can enhance the spontaneity of a reaction, i.e. convert a process ( A-->B )that is endergonic so that it is exergonic. 3) By optimizing the proximity and orientation of substrates and key catalytic residues in the active site, an enzyme can couple two half reactions, one highly exergonic, the other somewhat endergonic, to yield an overall thermodyna…

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  7. i have found one of the question which i cant really answer could please help me explain this in detailed thank you

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  8. Started by shaneoconnor5498,

    Q1 - Using more than one letter and powers .: Online homework:. Work out the value of these expressions. 9(p - q) when p = 14 and q = 6 2ab + 6c when a = 3, b = 2 and c = 9 92 - tuv when t = 3, u = 7 and v = 4 r st when r = 96, s = 3 and t = 4 a 28 - b when a = 72, and b = 8 2 3m When m = 3 2 2 54 - 3s + t when s = 3 and t = 6 Q2 - Using Negatives Work out the value of these expressions. pgr when p = -3, q = 4 and r = -5 -5(a - b) when a = 2 and b = -4 2 4s - st when s = -3 and t = -6 5c - d…

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  9. Started by Function,

    Hello everyone In math class, we've proven something that had to do something with tha tangent of a hyperbola: the tangent point P is the middle point of [QR] with Q the intersection of the tangent and one assymptote, and R the intersaction of the tangent with the other assymptote. After we've calculated the values for: [math]Q\left( \frac{a\cdot\cos{t}}{1-\sin{t}};\frac{b\cdot\cos{t}}{1-\sin{t}} \right)[/math] [math]R\left( \frac{a\cdot\cos{t}}{1+\sin{t}};\frac{-b\cdot\cos{t}}{1+\sin{t}} \right)[/math] [math]P\left( \frac{a}{\cos{t}};b\cdot\tan{t} \right)[/math] we started expressing that P is middle of [QR], and getting an equality. However:…

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  10. Started by cyberproxy,

    Can you help define these problems? 1) 1972: Assembly-line workers 2) Proletariat 3) Lumpen Proletariat 4) Bourgeoisie 5) Horricutural society

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  11. Ok i know this is a very basic question the difference of m.p and b.p. of iron(ii)chloride and iron(iii)chloride. But what is the exact reason? is it because of their hybridizations? (sp and sp2 rspctvly) or is it because the ionization potential of Fe3+ is a lot more than Fe2+ ? . Please help. Nd thnx in advanec

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  12. I've got this assignment and it states that we can't use any methods that involve creating a library of cDNA clones, but is based on RT-PCR (Reverse Transcription – Polymerase Chain Reaction). The only thing we know is the mature protein sequence. How do I design a primer that is specific to the mRNA?

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  13. Please can anyone help me solve this? 1. As an example, consider a two-level cache in which the L1 hit time is 5 ns, the L2 hit time is 20 ns, and the L2 miss time is 100 ns. There are 10,000 memory references of which 10 causes L2 misses and 90 causes L1 misses. Compute the hit ratios of the L1 and L2 caches and the overall effective access time 2. Write an assembly language program, which adds three numbers and stores the result at ADD. The numbers are defined at three consecutive locations

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  14. A Quality Analyst wants to construct a control chart for determining whether four machines, all producing the same product, are under control with regard to a particular quality attribute. Accordingly, she inspected 1,000 units of output from each machine in random samples, with the following results: 23/1000 15/1000 29/1000 13/1000 What is the estimate of the standard deviation of the sampling distribution of sample proportion for whenever this process is under control? I used the formula for standard deviation for population samples and it didn't give me the right answer. I think the answer was 0.0044. I have no idea how they got there.

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  15. I need help on this question for my test. So in homologous recombination, you have 2 double stranded DNA in close proximity. Lets say the top chromosome has 5 repetitive sequences right after another, and the homologous chromosome below it has the same 5 sequences. These sequences are about 500 base pairs long. Let's say there is a DNA break on the third sequence set on the top strand. Then, homologous recombination, crossing over, non-crossovers, and other mechanisms will occur. Explain a reason that would result in overall 7 repeats of the sequence on the top strand and 5 still on the bottom strand. Any help would be appreciated. Thanks. Here is a visualiza…

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  16. Started by azka,

    my lecturer give this assignment for 2 weeks. and i don't have any idea about the logic. can anybody help me, please?

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  17. Started by Amaton,

    This should essentially be an effusion-rate problem. I know the equation is [math]\dfrac{r_x}{r_y}=\sqrt{\dfrac{M_y}{M_x}}[/math], where [math]r[/math] is the rate of effusion and [math]M[/math] is molar mass. I know [math]M_{Ar}=39.95[/math] g and the effusion rate for arsenic(III) sulfide is [math]r=.28r_{Ar}[/math]. Therefore, [math]\dfrac{r_{Ar}}{0.28r_{Ar}}=\sqrt{\dfrac{M}{39.95g}}[/math]. I'm trying to find [math]M[/math]. After the math, I get [math]M=509.6[/math] g (to 4 significant figures). The closest working ratio for the arsenic compound seems to be two formula units, As4S6. This is the textbook answer. However, this molar mass is [math]492.04…

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  18. Started by Mai-Reborn,

    Pls can someone tell me how to calculate the resonant frequency of a short circuited loop of wire in terms of (1)distributed inductance and capacitance(2) in terms of conductor length and electrical speed.thanks for any help available

  19. Started by tomsmithucd123,

    Imagine you want to do some functional tests on some resistant mutants. To aid you in this you use a set of old-fashioned F’ plasmids that carry various parts of the chromosome How could you construct a merodiploid strain that is heterozygous for your mutations (sequenced above)? Remember: every move you make requires a positive selection. How could you determine whether your mutation is dominant or recessive? What could you say about the protein whose alteration caused resistance?

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  20. Started by zkeefe,

    Hello, I have been struggling with this program for a while and was wondering if anyone could help. I am trying to make a program where the user inputs an int 0-9 and then it will print out something like this: if user input=1 if user input = 3 I hope you guys get what im trying to say. so far i have: 1 **1 *21 321 import java.util.Scanner; public class Lab07 { public static void main(String[] args) { Scanner stdIn = new Scanner(System.in); int x; System.out.println("Enter a number 1-…

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  21. Started by seppy93,

    10.00 mL aliquot of a triprotic acid is reacted with 27.42 mL 0.168M KOH solution. Determine the molar mass of the acid. I'm not sure how can I find the mass of the acid, because I don't see anything mass-related to the acid. And also, does the "aliquot" affect anything?

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  22. Started by Ceasium,

    Hi, I need to integrate the following function: f(x) = 1/x2 * e1/x Where x does not equal 0. Determine a number a < 0 such that: The integral of a till 0 f(x)dx = f(a) What the question aks is on other words: Find a number a, such that the number a equals the surface under the graph and its position on the x-axis. All that remains for me is to determine the integral of the function, I have tried integration by parts, substitution with u = e1/x , and improper intergrals, but none seemed to work. (I was working in loops, or making the integral even more difficult) Can someone help me in the right direction?

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  23. Started by Elliepanayiotou,

    Can you PLEASE help me in making a high quality investigation plan.. For the following question .. 'Will protease be able to work in the mouth'

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  24. Started by tbz709,

    I have a multiplier circuit that multiplies a 2-bit number(0-3) with a multiplier factor of, 0, 1 or 2, ignoring 3 (not interested in result) So I have my truth table made and I understand everything about the question except the actual circuit. Asides from the "Don't care" answers, would I count every non-zero product to be 1? Thanks!

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  25. Started by eyal,

    Hi, Can anyone please show me how do i use the time evolution operator (V) applied on the ground state [g> and getting the same result as in the image below? i need to show the explicit calculation.. taken from - from Cirac & Zoller, Quantum Computations with Cold Trapped Ions Thanks!!

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