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Homework Help

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 matinjanin,

    arrachment? Answe to A is that it is dominant! But how do i do the rest?

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  2. Started by matinjanin,

    The pairwise map distances for four linked genes are as follows: A-B = 14 m.u., B-C = 30 m.u., C-D = 34 m.u., B-D = 4 m.u., A-D = 18 m.u., A-C = 16 m.u. What is the order of these four genes? Choose one of the alternatives below. A) ABCD B) ADBC C) CBDA D) BADC E) CADB F) BACD G) DABC H) DBAC I) BDCA J) DBCA K) None of the above

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  3. Started by matinjanin,

    does anyone know this?

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  4. Started by matinjanin,

    please help with following that is in the attachment

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  5. Started by matinjanin,

    The pairwise map distances for four linked genes are as follows: A-B = 14 m.u., B-C = 30 m.u., C-D = 34 m.u., B-D = 4 m.u., A-D = 18 m.u., A-C = 16 m.u. What is the order of these four genes? Choose one of the alternatives below. A) ABCD B) ADBC C) CBDA D) BADC E) CADB F) BACD G) DABC H) DBAC I) BDCA J) DBCA K) None of the above

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  6. Started by raja.mugavai,

    A'B'C'+A'BC'+A'BC+ABC How to simplify the above expression.... Kindly help me...

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  7. Started by ForeignHorse,

    When I substitute z=x+yi, I can't seem to work out the answer. Anyone knows how to solve this ? Thanks

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  8. Started by Science girl313,

    Q1: If a person breathes at the rate of 15 respirations per minute, and each respiration involves 0.500 dm^3 of air, calculate the total mass of air breathed in one hour at 280K and 1 arm pressure. Average molar mass of air is 28.8g/mol. Q2: A 600cm^3 gas sample contains only methane, CH4, and ethane,H2C_CH2 . Half of the sample was burned in oxygen and found to produce 486.8cm^3 of dry carbon dioxide at 1atm, 300K. The water produced during combustion had been removed. The remainder of the sample was found to require 187.8cm^3 of hydrogen at 1 arm and 300K to convert the ethene to ethane C2H6. A) determine the molar fraction of methane in the orginal sa…

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  9. If anyone could just help point me in the right direction, I've been at this for many hours and I can't figure out how! Thank-you! Propose a mechanism for the synthesis of Phthalic acid. Taking into account that you have the following organic reactants and any inorganic reactants, gases and material that you need. We have only learned the following reactions so I think I'll have to stick to these for the midterm: Electrophilic addition reactions (hydrogen halides, hydrogen bromide in the presence of peroxide, addition of halogen-Cl2 or Br2, Acid catalyzed addition of h20 and alcohols, oxymercuration-reduction, alkoxymercuration-reduction, hydroboration-oxidation, an…

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  10. Started by Chikis,

    [MATH]\frac{3.87^3+20}{3.87^3-20}[/MATH] I want solve the above using logarithm. I don't know how to solve it using logarithm because I can't deal with this: [MATH]\frac{10^{(0.5877)3}+10^{1.3010}}{10^{(0.5877)3}-10^{1.3010}}[/MATH] If this is given: [MATH]\frac{3.87^3\times20}{3.87^3\times20}[/MATH] It would have been easiar for me to solve if I add and subtract all the powers that has base 10. Please I need help.

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  11. Started by Extreme112,

    My assignment asks me to "Write the Boolean equations for an 3 to 8 decoder." Now from what I think I understand, you'll get something like this http://en.wikipedia.org/wiki/Decoder#mediaviewer/File:Decoder_Example.svg. Are the minterms just the boolean equations? Because I don't really see how else to make boolean equations.

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  12. Started by psyclones,

    Hi All, I found this problem, The sum of p, q, r terms of an Arithmetic Progression, are P, Q, R respectively: show that [latex] \frac{P (q - r )}{p} + \frac{Q (r - p )}{q} + \frac{R (p - q)}{r} = 0 [/latex] My thoughts on how to start the problem is; if [latex] S_{n} = \frac{a}{2} (n + (n-1)d ) [/latex] then the sum of say 'p' terms, would be [latex] P = S_{p} = \frac{a}{2} (p + (p-1)d ) [/latex] Therefore; [latex] Q = S_{q} = \frac{a}{2} (q + (q-1)d ) [/latex] [latex] R = S_{r} = \frac{a}{2} (r + (r-1)d ) [/latex] If I used the following series, to simplify the above P, Q & R series; [latex] S_{n} = 1 + 2 + 3 ... + n, [/latex] then [latex] …

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  13. Started by miller.4314,

    I need help with a problem in my CS420 Data Mining course. The question asks to use the Relief Algorithm for feature selection. The algorithm is as follows: W(A­i)new = W(Ai)old – (diff(X[Ai], H[Ai])2 + diff(X[Ai], M[Ai])2)/m where W(Ai) is the quality score for all feature Ai, X is a randomly selected sample, H is nearest Hit, M is nearest Miss, and m is the number of randomly selected training samples. Any help with this problem would be greatly appreciated. Thanks!

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  14. Started by unconstrained1,

    So basically I've been out sick for the past week and have no idea what is going on in my Honors Gen Chem II class. :/ I have a basic understanding of kinetics, but the class moves so fast that I feel I am very behind from missing two periods. The questions seem straightforward enough that they can be solved with the information I have provided; however, I am completely lost. http://njit2.mrooms.net/file.php/4799/Images_Chem_126_RH_/Z15-31.gif I just have a few questions, based off of the above image link: 1.The reaction below was studied by performing two experiments. NO(g) + O3(g) → NO2(g) + O2(g) In the first experiment (results shown in left table) the rate …

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  15. Started by ForeignHorse,

    Is this a binomial distribution question ? I need help for this. Can anyone explain ? Thank you in advance !

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  16. Started by rasen58,

    A child runs in a circular path with constant speed. Which one of the following quantities is constant and non-zero? A. Linear velocity B. Angular velocity C. Centripetal acceleration D. Angular acceleration E. Total acceleration I thought none of them would be constant since the direction of the vectors would always be changing when you move in a circle. But since I had to pick an answer, I thought it might be between linear velocity and angular velocity and picked linear velocity since there is a constant speed. But the answer is angular velocity. Why?

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  17. Started by rasen58,

    A uniform meter stick of mass 0.24 kg can be balance by a mass of 2.16 kg at the 100 cm mark if the fulcrum is placed at the point in cm ___. So the mass on one side is just the mass of the stick (0.24 kg) and the other side is (2.16 kg + .24 kg = 2.4 kg) So the torques have to be equal So on one side, it's 0.24 kg * 10 m/s^2 * d And the other is 2.4 kg * 10 m/s^2 * (100-d) So I set them equal to each other and got 26.4 d = 2400 d = 90 cm. But the answer is apparently 95 cm. why?

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  18. Started by madde,

    Question in the title?Like forum sites to ask science and math questions?

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  19. Started by physica,

    The time has come for me to propose my final year project. I can do a literature review or design a practical. The two subjects I am interested in are: Quantum Entanglement and Quantum Information Magnetic Imaging in Medicine Although I am interested I appreciate that others may know more about these fields. I'm also acknowledging that simple interest isn't going to cut it in terms of getting a good grade. Realistic projects are a must. Many thanks in advance

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  20. Started by bsl2724,

    If 75 mL of 0.01 M HCl is added to 100 mL of 0.15 M acetate buffer (pKa = 4.7) at pH = 5.7, what is the resultant pH?

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  21. Started by bsl2724,

    an enzyme catalyzes the phosphorylation of creatine from ATP, yielding creatine phosphate and ADP. Using the values on Table 3.3, first calculate the standard state free energy change for this reaction. Then, calculate the equilibrium constant. PLEASE HELP IM SO LOST!

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  22. Started by physica,

    Sorry for the hibernation recently I have assignments in and this question has had me stuck for 2 days straight. What I get for the first 2 parts of the question is to apply poisson's equation with cylindrical coordinates. Only the radius will change so del squared will only consist of the radius. For the general solution I get the following: V( r )=(p/6EE_0)(r^2)-(A/r)+B I am completely stuck on part C. I think that the boundary conditions are: V(a)=V(2a)=0. I use simultaneous equations to solve for A and B but my result is completely different to the solution given in C. Where do the logs come from? Where have I gone wrong? I would be very grateful if someone co…

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  23. Started by Anekto,

    Hello science forum and thanks in advance for the help I want to design in principle and test if a space elevator design could be possible already today I was thinking about the space elevator design and saw that its shortcomings was that the cables used to connect earth with the satelite in orbit were not strong enough today. Then i came to the conclusion that to solve this with today technologies one would ve to make breaks for the cable so it doesnt break under its own weight. This i thought about doing with helium filled balloon or stations that would carry the weight of the previous branch of cable and relieve the weight of the above section. What…

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  24. Please help!!

  25. Started by Nicco35,

    Could you help me with them, please. The bedrock plateau at a depth of about two meters and consists of almost unweathered quartz sandstone. Which of the following geophysical methods might be principally used to locate the ditch and why ? Gravimetry [density = density]. Magnetometry [magnetic susceptibility]. Geoelectric (resistance) methods [resistivity]. Radionuclide methods [of uranium, thorium and potassium]. Seismic (refraction) measurements [propagation velocity of longitudinal seismic waves]

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    • 11 replies
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