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  1. E

    Length contraction of a square

    thanks, I get it now.
  2. E

    Length contraction of a square

    How is it that "the case of motion along diagonal AC, both sides are contracted" ? Isn't it one side being contracted, the one parallel to motion? I'm having trouble picturing this.
  3. E

    Length contraction of a square

    If you have a drawing of a square (labeled ABCD starting at lower left and going clockwise) and it is first at rest in an inertial frame. When this square moves, length contraction changes its shape. In each of the following three situations the speed is the same, and the velocity is in the...
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    Neurons and axons

    can't somebody help me? :(
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    Lewis acid/base

    well to start with, since F has three lone pairs, it would seem to be a good explanation, except that it is so electronegative that most of the time, electron of hydrogen are with F instead, giving it a dipole moment. A Lewis acid is when it can accept electrons or donate protons, in this case...
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    Neurons and axons

    What problems does a neuron need to overcome to maintain the health and growth of the axon? I thought it has a problem with axon's length? Another question is: How would you estimate the muscle mass of a person? I know that muscle does not float, but adipose tissue does. Would I just...
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    Sordaria Questions

    thank you guys for all your help
  8. E

    Entropy How much of the water is solid?

    there should be an equation in physics specifically for adiabatic problems.
  9. E

    Calculate the change in energy of the hydrogen atom

    E = (-2.18 x 10^-18 J) (1/1 -1/16) = - 2.04378 x 10^-18 J The answer is negative because the atome loses evergy.
  10. E

    [chem]Lewis Structure-Expanded Valence Shell

    it's better that it fills its octet before making the charges be zero on a central atom. that's why there is resinance structures.
  11. E

    Chemistry questionpretty

    I did a project on Palladium, if you need that?
  12. E

    Sordaria Questions

    if anyboday has an idea please help me, because the paper is due very soon
  13. E

    Sordaria Questions

    I think the simplest hypothesis to work on is that there is greater number of crossing over when there is a bigger map distance. but this has already been tested, and i don't know if I can use it but just in my words...
  14. E

    Sordaria Questions

    Thanks for the idea Ouabache. I also found out that Sordaria has 7 chromosomes, but I don't know if that is useful here. Please tell me if this hypothesis is ok: Hypothesis: The color of the spores of Sordaria are different because it is polygenetic. It is due to many genes. If this is...
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    Sordaria Questions

    I'm really out of ideas. Help.
  16. E

    What would I do to be able to recover the silver metal?

    I think you would have to add HNO3 and a white precipitate would form in order for you extract silver ions. Going reverse, to dissolve the silver ions, you would have to add more ammonia.
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    Sordaria Questions

    Well, there actually three colors, but for second division segregation, I'd see either black and grey or I would see black and tan. So if I say my hypothesis is: Grey is dominant over tan by Mendelian genetics. To test this, I would have to interbreed them using the same technique that...
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    Sordaria Questions

    I assume they want me to come up with a hypotheses about Sordaria, and then describe what needs to be done in order for the hypothesis to not be rejected. I'm thinking, what if I want to find out why Sordaria is sometimes grey and sometimes tan? What causes this? can we minupulate the...
  19. E

    Nitrogen Fixation

    Does anyone know the answer to the second question?
  20. E

    A call for biology homework helpers!

    I personally want to thank you for your help the other day. I did very good on my test. :)
  21. E

    Nitrogen Fixation

    I've done some browsing on Gleocapsa and found out that it is unicellular. I can find them in wet mounts, ponds, moist soil, damp or wet areas. I also found out that Gleocapsa is a nitrogen fixer. My question is, since Gleocapsa is surrounded by a clear, gelatinous coating which makes one or...
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    Sordaria Questions

    Please help. Thank's in advance. :)
  23. E

    Sordaria Questions

    Needs editing and maybe more info? It is supposed to be detailed. Please edit this essay. I'd like to know if I got all the questions covered. I don't know how to approach this writing assignment, but I have come up with the following, Here it goes: Even though Sordaria is...
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    Sordaria Questions

    The following is an assignment for homework for an intoductory biology class in college: Sordaria is a member of the ascomycete fungi, a group often used in genetics experiments. Yet, Sordaria is haploid. How can a haploid organism be used to test genetics problems when such things as...
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    Mating, how many offspring?

    I get it. I understand that: For BbXBb, you get 1-BB, 2-Bb, 1-bb For Bbxbb, you get 2-Bb, 2bb For bbXBb, you get 2-Bb, 2bb For bbXbb, you get 4-bb Adding together, you get 1-BB, 6-Bb, 9-bb (For a total of 16 offspring). I finally understand that. The only problem I'm stuck with now is...
  26. E

    Mating, how many offspring?

    By looking at: BbssXBbss BbssXbbss bbssXBbss and bbssXbbss. I get 3/16. In the top, I showed my thinking to derive this. Using my first method, all the way where I started from, I get 3/4. Thinking about it, I think it should just be 1/2. What about you? What do you get when you worked out...
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    Mating, how many offspring?

    What's the answer? Thanks for all your help. I really appreciate it. I'm trying to understand what you typed here, but I don't get it. What answer do you come up with? maybe that will help me see how to derive that answer. .....hmmmm.....is the answer 3/16? because (1/2)(3/4)(1/2)=3/16...
  28. E

    Mating, how many offspring?

    What is that supposed to mean? Cross each of the offspring with the remaining offspring and then see how many "B" there are? What is the shortcut? Would you happen to know the correct answer? I doubt that we're doing this correctly, because I would only get about 40 seconds to do the...
  29. E

    Mating, how many offspring?

    So, then how to get the probability answer for the question. I have the punnet square worked out, as you can see on top.
  30. E

    Mating, how many offspring?

    but the "ss" can't be two different colors because they both represent spotted. and "bb" can't be of two different colors because they represent red. so only two gametes are possible for Bbss and one gamete for bbss. That is what I've been told. I just don't know how to get the right answer...
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