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  1. L

    Need help with distance problem

    The distance between point A and B is 1km. A dog and man start walking at the same time from point A toward point B. They will keep walking (if reached B then walk back toward A immediately, and if reached A then walk back toward B immediately, so on). 1.Given that the dog walks twice as fast...
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    Definite integral

    Yes that is how I wrote it. How should I solve the second part? I've been looking everywhere... The only thing I could find was that it's supposed to be the anti derivative.. Well 3x is the antiderivative of 3 isn't it?
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    Definite integral

    All right, well this is probably wrong but here is what I got! I took out the 2, which I didn't I could do which is probably what confused me the most.. I'm having trouble with the symbols right now but I essentially put the 2 in front of the integral of the function and substracted the...
  4. L

    Definite integral

    \int^{6}_{3} f(x)dx = 42 - 12 = 30 Is this correct? If so I don't know how 2f(x)-3 will affect the integral without knowing what the actual function is... I must be missing something
  5. L

    Definite integral

    That's probably what the question is and I'm assuming it was a typo. I will ask tomorrow for sure but in the mean time how would I solve if the question were indeed what gb7nash thinks? I have looked through all of my notes and can't find anything to get me started...
  6. L

    Definite integral

    We don't have a text book for this class.
  7. L

    Definite integral

    Mark44 - I copy and pasted the actual question. However, my prof is chinese so maybe that's why the question seems confusing? I really don't understand what he wants me to find...
  8. L

    Definite integral

    The function isn't given so I'm not quite sure how to do this. We've only learned how to calculate area beneath the curve with simple geometry and to use the Riemann sum.
  9. L

    Definite integral

    The thing is, it that last equation is correct. It is =12. Which is why it doesn't make sense to me.
  10. L

    Definite integral

    We are just starting integrals right now and I'm having trouble with this problem. I know how to solve a definite integral but I don't quite understand what is being asked here? Just wondering if anyone could let me know where I should start? if∫0,3f(x)dx=12, ∫0,6f(x)dx=42,find...
  11. L

    Limit problem

    Thanks! It should be 6x right? So is 1/6 the correct answer?
  12. L

    Limit problem

    Here is how I did it in case it might help lim->0 (e^x)' - 1' - x' - (x^2/2)' /x^3' = lim->0 (e^x' - 1' - x')/ 3x^2' = lim->0 (e^x' - 1') / 5x' = lim x->0 (e^x) /5
  13. L

    Limit problem

    I used L'Hopital's rule three times and ended up with limx->0(e^x)/5 Is this correct? It still gives me 0 on top.
  14. L

    Limit problem

    If I use l'Hopital's rule won't I end up with 3x^2 at the bottom?
  15. L

    Limit problem

    Homework Statement Evaluate limx->0 (e^x - 1- x - (x^2/2))/x^3 The Attempt at a Solution I can't remember how to solve this limit. Do I need to evaluate each part seperately? I plugged in the 0 to find that the limit does exist. I just can't seem to figure out what to do next.
  16. L

    Gas cylinders in space

    I also found: If there is another object nearby, the time the cylinders take to orbit that object can be used to determine mass. (Kepler's law of planetary motion) Use a spring to measure a pulling force on each cylinder and use Newton's second law
  17. L

    Gas cylinders in space

    I don't want answers, just to be pointed in the right direction... I think I found 2 ways. To apply a force to each cylinder to measure the velocity and find the acceleration. Divide force by acceleration. Use a small centrifuge and determine rpm and ''radius''. Using a=v2/r, find...
  18. L

    Gas cylinders in space

    What are 5 ways to determine which of 2 identical cylinders is empty and which is full of gas if they are in space?
  19. L

    % Energy lost due to friction

    Can the % of Energy lost due to friction be negative? Or is it always positive?
  20. L

    Static friction on a car on a circle

    The speed is 20 km/h, the radius is 113m and the angle of the slope is 8 degres
  21. L

    Static friction on a car on a circle

    OK but in this case which direction would the static friction be? I just need to know to draw the free body diagram.
  22. L

    Static friction on a car on a circle

    When a car is moving on a circular track which is sloped away from the centre of the track, is the static friction keep that car on the circle (constant speed) towards the outside of the circle, opposite the acceleration? I'm having trouble seeing this because to me, the car would want to...
  23. L

    Vectors and impulse force

    I actually do know how to subtract vectors, but my professor had said that we did not have time to cover that section, so we wouldn't see vector addition/subtraction. So I assumed we wouldn't have any assignments on it, and thought there was another way to do this problem. Anyways, I ended...
  24. L

    Vectors and impulse force

    I ended up just doing (4.17j-5.448i) / 3/1000 Fnet=(1390j-1816i) N does that work?
  25. L

    Vectors and impulse force

    OK so I used the pythagorea theorem but that gave me the resulting momentum when I only need the difference in momentum. It's probably really simple, I'm just not seeing it right now...
  26. L

    Vectors and impulse force

    OK, so what would the variation of momentum be ? P = mv I have (4.17 j - 5.45 i) kgm/s But my problem is that I can't subtract j's and i's. I need either two horizontal vectors or two vertical vectors Then I just need to divide the change in momentum by 3/1000
  27. L

    Vectors and impulse force

    So Vo is 29.43 m/s, and the back towards pitcher component is -29.43 m/s correct? And I would just need to find the horizontal velocity ?
  28. L

    Vectors and impulse force

    Ohh, I thought I was looking for V. Vo = 29.43 j m/s So I found Pi= 5.448i kgm/s and Pf= 4.17j kgm/s I need to find the change in momentum so Pf-Pi, how do I go about subtracting those vectors?
  29. L

    Vectors and impulse force

    OK, but the acceleration would be negative, so how can I find the square root?
  30. L

    Vectors and impulse force

    or s=vot + a(1/2 a) t2
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