# Search results

1. ### Help with conversion of equation

Q=C_{\rho*v}^y i agree with whozum. you should just use logarithms. it doesnt matter about the subscript.
2. ### Circular motion

wouldnt the braking create a greater magnitude of friction or create friction if there wasnt any initially present?
3. ### Derivative of sin(3x)

i agree with OlderDan. h(x)=f(g(x)) if you have that, then: h'(x)=f'(g(x))*g'(x) so, sine is not the derivative of itself.
4. ### Gravity, in essence

antigravitation, the heim theory looks quite interesting. i love to look at new theories, because i have little faith in the current theories. unfortunately, the computer im on does not have acrobat reader, so i am unable to view the files. the computer at my job = not cool. :yuck: when i get...
5. ### A simple question

im always looking for a challenge, so i think ill challenge myself with real analysis. the description you provided makes it seem like calculus with proofs. that ought to be fun :rofl: . ill talk to my bc teacher and see what she thinks. thanks quasar987 :wink: .
6. ### A simple question

what type of problems are involved in real analysis and abstract algebra? hehe, guess the wrong section to post this...moderators feel free to move it :smile:
7. ### A simple question

i just finished calculus bc ap at my school, and i have no more math classes to take there; i need all 4 years of math to graduate with honors :confused: . im planning on taking a college course in math next year, but i dont know what math course to take. i was wondering if any of you had any...
8. ### Integrals of Trig Functions

shouldnt it be: \int sec^2x~tanx~dx=\int\frac{sinx}{cos^3x}dx then, you could do u-sub and set u=cosx and go from there? *Edit* dextercioby, you put sinx instead of cosx. i think tanx = sinx/cosx *Edit*
9. ### What is the centripetal acceleration of the child?

have you figured out the velocity in terms of the period yet?
10. ### Integral Help

1) you have \frac{dy}{dx}=2x+1[/tex] so, you set up the integral: \int dy = \int(2x+1)dx solve the indefinite integral, plug in for x and y, and solve for C. 3) this a u-sub problem, where u=3x^2-7 and [itex]du=6xdx 2) use the same concept as in #1
11. ### Exam study - help a brother out! (diff etc)

yes, the first one looks fairly simple. what do you know about parametric equations and their derivatives?
12. ### Properties of CsF and NaF

NaF having a smaller radius could account for its higher boiling point. If an atom has a smaller radius, that means the elements are closer together, so more heat is needed to seperate them.
13. ### Lin algebra question

well, heres what i do to find the point of intersection of two lines. i just set them equal to each other.
14. ### Review Questions- Need Help

hmmm, lets see: \frac{1}{2}mv^2+\frac{1}{2}I\omega^2=mgh \frac{1}{2}mv^2+\frac{1}{2}(\frac{2}{3}mr^2\frac{v^2}{r^2})=mgh \frac{1}{2}mv^2+\frac{1}{3}mv^2=mgh 3mv^2+2mv^2=6mgh 5v^2=6gh \frac{5v^2}{6g}=h h=2.125~meters yea, i got the same thing as cde42003. :confused:
15. ### Review Questions- Need Help

what is the inertia of a hollow sphere? I=\frac{2}{3}mr^2?
16. ### Lin algebra question

what method do you use to find the intersection of a line and a plane?
17. ### The force of gravity can only be observed between two or more bodies

gravitons nor gravitational fields exists. they are both just abstract concepts that try to explain something that has not yet been conceived. want to know something else? electric fields dont exist either!
18. ### Volume of

try cylindrical shell method
19. ### AP Physics B Test - Torque Help?

heh, saphic_yellow. how did you think of the physics exam. i took it. i didnt think it was bad at all. unfortunately, when i view a test as easy, that is usually not the outcome. :frown: im too impatient to test. i hope you did well, though.
20. ### Indefinite integral

are you trying to do: \int\frac{dx}{e^x+e^{-x}} if so, for a=b=c: \int\frac{dx}{e^{ax}+e^{-bx}}=\int\frac{dx}{e^{cx}+e^{-cx}}=\frac{tan^{-1}(e^{cx})}{c}+C i hope that helps
21. ### Fluid Mechanics Help

show some work?
22. ### Arithmetic sequence problem

isnt question three a geometric series? \sum_{n=0}^{\infty}20(\frac{9}{10})^n if thats the case, what do you know about geometric series that makes them converge or diverge?
23. ### Primes of the form 4n+1

are you trying to do: \sum_{n=1}^{\infty} 4(n+1)=\infty
24. ### 2 Chemistry Grade 11 Questions

you could just set up an acid-base titration experiment.
25. ### Lagrange Error

arg, i just went to a bc calculus session at my school. we did a lagrange error problem. the whole concept baffles me for some reason. im sure many wont be on the ap test, because i managed a 5 on the practice one; however, i would love to learn to do it. anyone want to do a sample problem...
26. ### Integral of e^(2x)sin[3x]?

euler's formula e^{ix}=cos(x)+isin(x) or some variation of that.
27. ### Tricky trig substitution

7/2 exponent is like my square root to the 7th -\frac{(\sqrt{81-x^2})^2}{7}=-\frac{(81-x^2)^{7/2)}{7} also, we had to use trig substitution, so that left out the easy 81-x^2 sub
28. ### Tricky trig substitution

im hoping i worked this out right; its long: \int x(81-x^2)^{5/2}dx the integral contains a^2-x^2, so i set x=asin\theta. that would make x=9sin\theta and dx=9cos\theta d\theta: \int 9sin\theta(81-81sin^2\theta)^{5/2}9cos\theta d\theta = \int 9sin\theta[81(1-sin^2\theta)]^{5/2}9cos\theta...
29. ### Compton Effect

correct! they have the same masses, so the cue ball transfers all of its energy to the eightball making it move forward and the cue ball come to a halt.
30. ### Integral form

hehe, yea i left out the 2...so its half the integral when you work it out. this computer at work was frustrating me, so i forgot it. (my excuse :rofl: )