Recent content by EvilBunny

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    Evaluate this indefinite integral

    As for trig sub i come down to S 1/(U² * sqrt(U-9) ) which would mean my hypotenus is sqrt(U) and i will have one side 3 and the other sqrt( U-9) ? right I just never dealt with sqrtU as a side until today
  2. E

    Evaluate this indefinite integral

    (Ax + B)/(9 + x^2) + (Cx + D)/(9 + x^2)^2 [ (Ax + B)(9+x^2) + (Cx +D ) ] / ( 9 + x^2 ) ^2 = 1/(9+x^2)^2 (Ax + B)(9+x^2) + (Cx +D ) = 1 9Ax + Ax^3 + 9B + B^2 + Cx + D = 1 Ax^3 + Bx^2 + (9A +C )x + 9B + D = 1 A=0 , B=0 , C=0 , D=1 1/(9+x^2) ^ 2 ?? did i do something...
  3. E

    Evaluate this indefinite integral

    Evaluate this indefinite integreal S = integral S 1/(9+x^2)^2 This has been driving me and my friend nuts. We tried partial fractions only to realise that it brings us back to the same thing because its not a polynomial over a polynomial, we tried by parts and it did not help and we...
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    Titration Lab

    Okay thx for your replies the teacher said my answer is reasonable. I had 52 because of signaficative figures and a bunch of roundings. As for the low molar mass the teacher said its an acid you wouldn't know . So something obscure and uncommon or something of the sort
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    Titration Lab

    (purpose is to find molar mass) At the start we dissolved 0.945 grams of unknown weak acid into water and made it up to 100 ml Then we used 25 ml of that solution and titrated it until the end point. Now , this is a monoprotic acid so it's going to take 1 mol of acid to neutralise 1 mol of...
  6. E

    Simple harmonic motion , Particle

    Homework Statement A 150 grams particle oscillating in SHM travels 24 cm between the two extreme points in its motion with an average speed of 60cm/s Find a) angular frequency b) the maximum force on the particle C) the maximum speed The Attempt at a Solution My first...
  7. E

    Friction, object at rest then accelerates.

    Well I'd go with kinetic friction. As its asking me to find the acceleration , but it could be possible its 0 so I could verify if the force on the block is bigger then Fs wich would mean it would slide , wich would mean its kinetic only. Well I got it I think. Thank you
  8. E

    Friction, object at rest then accelerates.

    Homework Statement A 2.5 kg block is on a 53 degres incline for wich Uk = 0.25 and Us = 0.5 . Find its acceleration given that (a) it is initially at rest. I don't know how to approach this. We have kinetic friction when an object slides. This object starts at rest. Does that mean...
  9. E

    Limits at infinity

    lim as x goes closer to minus infinity. x^4 + x^5 now visibly the answer is minus infinity since the equation are simple. But aside from saying x^5 is bigger then x^4 could there be anything else to do ?
  10. E

    Implicit diffrantiation

    Homework Statement I need to find a tangent line equation but my main problem is isolating actually. sqrt ( 2x + 2y ) + sqrt ( 3xy) = 13 The Attempt at a Solution 0.5 ( 2x + 2y ) ^ -0.5 (2+2y') + 0.5(3xy) ^ -0.5 ( 3 ( y + y' x ) ) = 0 this is where I get stuck
  11. E

    Inverse Trig function derivative

    Neat I get it, thanks.
  12. E

    Inverse Trig function derivative

    Homework Statement Let arctan (\sqrt{3x^2 -1}) then dy/dx Well I know that the derivative of arctanx is 1/ 1 + x ² but when I got something other then simply x I don't know how to proceed
  13. E

    Derivatives. Product rule with 3 products

    K managed to get it off of that thx
  14. E

    Derivatives. Product rule with 3 products

    Homework Statement If f(x) = (3 x )(sin x) (cos x), find f'( x ). A question I have is , is there anything special to do when you have 3 products instead of 2 The Attempt at a Solution Well I used the product rule as if am multipling (3xsinx) (cosx) but that doesn't...
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    Derivative question

    My teacher does like putting in nasty problems sometimes tho. Maybe thats it ? sometimes he writes soemthing partlially and says you will know how next week.
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