Recent content by DB

  1. D

    Very easy question

    simple question, if the derivative of cos(x) as x->0 is 1, the is the derivative of cos(3x) as x->0 = 1 aswell?
  2. D

    Having a little trouble, very typical question

    thanks everyone, btw hallsofivy displacement is a vector, distance is not. just to cleat that up :) thanks again i understand the problem now
  3. D

    Having a little trouble, very typical question

    oh im sorry, it is suposed to say 100m North
  4. D

    Having a little trouble, very typical question

    sry, i cant find the mistake your talking about, would that 85 be -115?
  5. D

    Having a little trouble, very typical question

    im not use to working is 3D so i need some help you are going to a restaurant. you leave your apartement and take the elevator 30 m down, then 15 m south to the exit. then u travel 200 m east and then 100 m to the restaurant. what is your displacement. so what i did is: -30k -15j...
  6. D

    Simple question, tangent line

    finally, got it
  7. D

    Simple question, tangent line

    thanks for the replies, but i dont understand how the c.d is 2h(2+h)
  8. D

    Simple question, tangent line

    but those are different terms, arent i looking for a common denominator?
  9. D

    Simple question, tangent line

    i dont understand
  10. D

    Simple question, tangent line

    thanks okay stupid mistake, now im stuck again tho \frac{2}{2(2+h)}-\frac{(2+h)}{2(2+h)}*\frac{1}{h} comes out to \frac{-1}{h}}*\frac{1}{h} gives me -1/h which doesnt work, darn
  11. D

    Simple question, tangent line

    really isnt calculus but thats the name of my class so, anyway im having a problem here. i think its pretty simple im just missing something. im supposed to find the slope of the tangent line using one point and: slope of tangent line = \frac{f(a+h)-f(a)}{h} h\rightarrow0 find slope...
  12. D

    Circular motion question

    nvrm, the it is F \propto f^2mr thanks tho
  13. D

    Circular motion question

    doing a lab report on circular motion and was asked to make a combined proportionality statement, just asking yes or no, is this right? F_c \propto f^{2} \propto a_c \propto \frac{1}{m} \propto r where "F_c" is the centripetal force, "f" is frequency in Hz, "a_c" is the centripetal...
  14. D

    How do they know the universe is expanding

    are you saying that space is infinite?
  15. D

    How do they know the universe is expanding

    I see, so really the notion that the universe is still expanding today is an assumtion?
Top