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  1. #136
    Insane Particle Collider Pman's Avatar
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    Default Re: Official BMGf Homework Tutor/Help Thread

    Username: pman
    Best Subject: Physics/maths

    I'm a second year nuclear/medical and radiation physics student at uni.

    can deal with most problems physics related...people are welcome to PM me.

    Quote Originally Posted by Ruckus Jorgee View Post
    I tried asking this question all over Yahoo yesterday and today and always got something irrelevant whether it was too long or that 10 days were missing from the Gregorian Calendar which has nothing to do with this, what I'm about to say.

    Recently on Starry Night, I just figured out that 15,719 years from the earliest of my birthdays I can view in there is an exact full amount of days thus I decided to calculate it for the 9th time again. I started out well with the exception of my subtraction error. I took the new sunrise time of 4:25:59 PM PDT and subtracted it from the old and the original sunrise time of 8:12:27 PM PDT and came up with a 3 hour 46 minute and 28 second difference. Then I took 15,719 years and multiplied them by 365.25 days per year because the year is normally 365.25 days or was in this case; I'm way far back in BC for it to be recognized as its current length of about 365.24219 days. I came up with 5,741,364 days and 18 hours and then added an additional 62 days and 6 hours to it to bring it up to a whole amount of days rather than a mixed number and then I came up with 5,741,427 days total. I timsed that by 24 hours per day and received 137,794,248 hours total, then timsed that by 60 minutes per hour and received 8,267,654,880 minutes total, then timsed that by 60 seconds per minute and received 496,059,292,800 seconds total; yet those were the amount of solar seconds. I still had to subtract the result from those 3 hours 46 minutes and 28 seconds drifting backwards. I took 60 minutes per hour and multiplied it by 3 hours and received 180 minutes then added 46 minutes to the 180 minutes and received 226 minutes, then timsed it by 60 seconds per minute and received 13,560 seconds, then added an additional 28 seconds to the original 13,560 seconds and received 13,588 seconds. Then I took 496,059,292,800 seconds, subtracted 13,588 seconds from it and came up with now 496,059,279,212 seconds total as in clock seconds, seconds that's passed on the clock since that beginning and then divided it by 5,471,427 days, the amount of days these amount of seconds were actually. I had a breeze going through this part with the exception of my subtraction error thus during the division part I started having trouble.

    Edit: I had the length of day right in seconds the whole time. So fixed my work. It seems like there was nothing wrong with my division. The 6 was correct. My subtraction was incorrect as I went through and evaluated everything. Instead of making the 2 a 12 I think I took 2 from 3 and then subtracted 9 from 8 before dividing by the number of days.

    What is the exact question you are trying to solve

    EDIT:can also do health science to a certain extend (medical physics)
    Last edited by Pman; 3rd May 2011 at 10:33 PM.
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  2. #137
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    Default For EE or Physics students

    This question is for an EE or physics student.

    Do you know how much power a return signal has to have in order for radar to be useful?

    Here is why I need to know this. I'm designing a satellite that must detect a piece of space debris (Delta II second stage, about 6 meter tall 2.4 meter diameter radius) at a distance of up to 1 km. The satellite size is one cubic meter, so we don't have much room to work with antenna size. Also, we don't have very much power to spare. Ideally I would like to use no more than 30 Watts, and an antenna more than 0.5 m^2 would probably not be practical.
    That's nice.

  3. #138
    OBEYMYGOD GoldenrodGOD's Avatar
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    Default Re: Official BMGf Homework Tutor/Help Thread

    Can anyone please help me with my chemistry?

    How many moles of H2 gas are produced when 0.1 mol of Mg reacts with excess HCl according to the equation:

    Mg(s) + 2HCl(aq) -> MgCl(aq) + H2(g)
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  4. #139
    megane shota hurristat's Avatar
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    Default Re: Official BMGf Homework Tutor/Help Thread

    Quote Originally Posted by GoldenrodGirl~ View Post
    Can anyone please help me with my chemistry?

    How many moles of H2 gas are produced when 0.1 mol of Mg reacts with excess HCl according to the equation:

    Mg(s) + 2HCl(aq) -> MgCl(aq) + H2(g)
    If moles are a measure of quantity, and the equation there is tells you how many molecules are involved in the reaction per reaction, use ratios and you should be able to figure it out. I don't want to tell you the answer, because then you don't learn it, but if you're having issues, or want me to explain the concept further, feel free to shoot me a PM/VM.

  5. #140
    Registered User P N N K's Avatar
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    Default Re: Official BMGf Homework Tutor/Help Thread

    I need to list 10 ways a diode can be used in a series circuit. Can someone help?
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  6. #141
    Team Poland Krzysztof's Avatar
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    Default Re: Official BMGf Homework Tutor/Help Thread

    Username: Krzysztof
    Best subject: Mathematics (which is kinda vague, really, because what kind of math can I really do?)

    "Clearly", mathematics is my best subject since the Ph.D. I'm currently working on is in mathematics. XD

    I for some darn reason can't understand geometry enough to tutor it. I get chills down my spine each time I'm confronted with those two column proofs. As a result, I'm more of an algebra person. XD

    The courses I can tutor include (but are not limited to):

    High School:
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  7. #142
    Now with capital letter Pseudonym's Avatar
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    Default Re: Official BMGf Homework Tutor/Help Thread

    Just wondering...
    Could someone help me with a little calculus exercise?

    lim(x->0) (log(1+10x))/x
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  8. #143
    Team Poland Krzysztof's Avatar
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    Default Re: Official BMGf Homework Tutor/Help Thread

    Quote Originally Posted by pseudonym12 View Post
    Just wondering...
    Could someone help me with a little calculus exercise?

    lim(x->0) (log(1+10x))/x
    Quick question: are you using or (i.e. the natural log)? I ask this because different parts of the world use one of those two definitions.

    I'll proceed as follows. The answer will differ by a constant based on how you define your log. So, we observe that

    .

    Now, we can apply L'Hôpital's rule (i.e. differentiate both the numerator and denominator).

    You will get



    if and you will get



    if .

    Thus, it follows that



    if

    or



    if

    I hope you're able to make sense out of this!!

  9. #144
    Registered User Du Sundavar Freohr's Avatar
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    Default Re: Official BMGf Homework Tutor/Help Thread

    Im only in 8th grade, but I have read and understood history books for 12th graders and passed a 12th grade history test so....
    Du Sundavar Freohr. History (any kind you need)
    "fsk you you little fsk. you are nothing but a fsk, you're parents were fsks. everybody you ever loved was a fsk. I fsking spit on fsking you and your fsking ancestors. you fsk around everybody all fsk like so stop being so fsking fsk you fsk from fsk land you fsking fsk, you fsking hear me you fsk? fsk you." A normal convo with a familiar lover of N.
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  10. #145
    megane shota hurristat's Avatar
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    Default Re: Official BMGf Homework Tutor/Help Thread

    Quote Originally Posted by Du Sundavar Freohr View Post
    Im only in 8th grade, but I have read and understood history books for 12th graders and passed a 12th grade history test so....
    Du Sundavar Freohr. History (any kind you need)
    was it an essay test?

  11. #146
    Registered User Du Sundavar Freohr's Avatar
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    Default Re: Official BMGf Homework Tutor/Help Thread

    No
    "fsk you you little fsk. you are nothing but a fsk, you're parents were fsks. everybody you ever loved was a fsk. I fsking spit on fsking you and your fsking ancestors. you fsk around everybody all fsk like so stop being so fsking fsk you fsk from fsk land you fsking fsk, you fsking hear me you fsk? fsk you." A normal convo with a familiar lover of N.
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  12. #147
    Shhhh
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    Default Re: Official BMGf Homework Tutor/Help Thread

    I'm still learning but hey who isn't ya know.
    I am willing to help anybody having trouble playing their guitar.

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  13. #148
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    Default Re: Official BMGf Homework Tutor/Help Thread

    What would be a good ~10-minute activity to help teach a class about aphorisms?

  14. #149
    Insane Particle Collider Pman's Avatar
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    Default Re: For EE or Physics students

    Quote Originally Posted by TheMissingno. View Post
    This question is for an EE or physics student.

    Do you know how much power a return signal has to have in order for radar to be useful?

    Here is why I need to know this. I'm designing a satellite that must detect a piece of space debris (Delta II second stage, about 6 meter tall 2.4 meter diameter radius) at a distance of up to 1 km. The satellite size is one cubic meter, so we don't have much room to work with antenna size. Also, we don't have very much power to spare. Ideally I would like to use no more than 30 Watts, and an antenna more than 0.5 m^2 would probably not be practical.
    without doing any maths, you could probably do it with only a couple of watts. electrical engineering isn't my specialty but I doubt you'll get much help on here...

    Also, do you mean diameter or radius? there is no such thing as a diameter radius...

    give me the exact details and I migth be able to work it out.
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  15. #150
    Banana eating Gengar GengarEatBanana's Avatar
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    Default Re: Official BMGf Homework Tutor/Help Thread

    I see you don't have a World History Tutor, I'll step in :)

    (Don't worry I'm very good at History; it's my best subject. If you need me for any other history I can help.)

    Name: GengarEatBanana
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