Official BMGf Homework Tutor/Help Thread - Page 10

1. ## Re: Official BMGf Homework Tutor/Help Thread

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.

Originally Posted by Ruckus Jorgee
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.

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)

2. ## 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.

3. ## Re: Official BMGf Homework Tutor/Help Thread

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)

4. ## Re: Official BMGf Homework Tutor/Help Thread

Originally Posted by GoldenrodGirl~

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. ## 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?

6. ## Re: Official BMGf Homework Tutor/Help Thread

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:
- Algebra
- Trigonometry
- Precalculus
- AP Calculus AB/BC
- AP Stats (kind of)

University Level:
- Calculus (1,2,3, Vector Calc)
- Abstract/Linear Algebra
- Topology (kind of)
- Statistics (kind of)
- Number Theory
- Differential Equations (both Ordinary and Partial)
- Differential Geometry (kind of)
- Analysis (Real or Complex...for the most part)
- Discrete Math

7. ## 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

8. ## Re: Official BMGf Homework Tutor/Help Thread

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

lim(x->0) (log(1+10x))/x
Quick question: are you using $\log (x) = \log_{10}(x)$ or $\log(x) = \log_e(x)$ (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

$\lim_{x\to&space;0}\frac{\log(1+10x)}{x}&space;\longrightarrow&space;\frac{\log(1)}{0 }\rightarrow\frac{0}{0}$.

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

You will get

$\lim_{x\to 0}\dfrac{\dfrac{10}{1+10x}}{1}=\lim_{x\to 0}\frac{10}{1+10x}=10$

if $\log(x) = \log_e(x)$ and you will get

$\lim_{x\to 0}\dfrac{\dfrac{10}{\ln(10)(1+10x)}}{1}=\lim_{x\to 0}\frac{10}{\ln(10)(1+10x)}=\frac{10}{\ln(10)}$

if $\log(x) = \log_{10}(x)$.

Thus, it follows that

$\lim_{x\to 0}\frac{\log(1+10x)}{x} = 10$

if $\log(x)=\log_e(x)$

or

$\lim_{x\to 0}\frac{\log(1+10x)}{x} = \frac{10}{\log(10)}$

if $\log(x)=\log_{10}(x)$

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

9. ## 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)

10. ## Re: Official BMGf Homework Tutor/Help Thread

Originally Posted by Du Sundavar Freohr
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?

No

12. ## 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.

Subject:Guitar and Trombone
Teacher:King Maggot

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

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

14. ## Re: For EE or Physics students

Originally Posted by TheMissingno.
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.

15. ## 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
Subject: World History

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