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  1. If net force is straight up, then the x...

    If net force is straight up, then the x components of both forces must cancel each out, that is: Let R be the net force applied by red ridding hood, and W be the net force applied by the wolf such...
  2. Question: Trig identities

    by Nhatkiem
    Answers
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    497

    Please put parenthesis where needed. Is that...

    Please put parenthesis where needed. Is that cos(x) or cos (x+1), is that sin(x)cot(x/2) or sin(cot(x/2))?
  3. Answers
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    No no essentially what you are doing are adding...

    No no essentially what you are doing are adding two vectors by their vertical and horizontal components and getting the resultant vector to represent two vectors as 1 vector. Then you are left with 2...
  4. You are on the right track. Regardless of how...

    You are on the right track. Regardless of how much water he drinks, his weight without water should remain the same! Keep going!
  5. Answers
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    Can you name his laws and what the laws mean?...

    Can you name his laws and what the laws mean? That should help you discuss this further.

    I'll start with the first one for you.

    Newton's first law is the law of Inertia, that an object in...
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    you have s=\sqrt{\frac{t-q}{t+2q}}, try...

    you have

    s=\sqrt{\frac{t-q}{t+2q}}, try squaring both sides and see if that helps as a first step.
  7. Answers
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    There is no need to post twice here and post 2...

    There is no need to post twice here and post 2 different topics in the homework section. Also if this is homework Shegun4u, you are not allowed to post here for answers.
  8. Answers
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    What the format y=mx+b (this is known as the...

    What the format y=mx+b (this is known as the y-intercept form) allows you to do is get information quickly by plugging in a value for x you get an output for y. Similarly you can write that ...
  9. Answers
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    If you subtract \frac{mv^2}{2} from both sides,...

    If you subtract \frac{mv^2}{2} from both sides, you then have

    E-\frac{mv^2}{2}=mgh

    You only need to isolate h now, there is a leading coefficient of "mg" on h. Divide both sides by this...
  10. Question: Motion in 2-d

    by Nhatkiem
    Answers
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    1,151

    This is just one of those problems that's easy to...

    This is just one of those problems that's easy to set up.. but a pain in the butt to do the actual computation. Algebraically I do not see anything wrong with the way you have set up the problem.
    ...
  11. Answers
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    Lets first figure out acceleration in the y...

    Lets first figure out acceleration in the y direction

    y_f=\frac{at^2}{2}+v_{0y}t+y_0

    the final position is (yf) is 0, the initial position (y0) is 6.89, and the initial velocity(v0y) in the y...
  12. Question: Motion in 2-d

    by Nhatkiem
    Answers
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    1,151

    If you used quadratic to figure out t, did you...

    If you used quadratic to figure out t, did you also test for when it would be

    b^2-expression and not just b^2+expression?

    Anyway, I plugged in your equation hoping maple would be able to figure...
  13. Question: Motion in 2-d

    by Nhatkiem
    Answers
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    1,151

    I'll see if I can take a look at it after school....

    I'll see if I can take a look at it after school. I just finally received my financial aid award letter after waiting for 9 months haha... Anyway I got some paper work to fill out and some of my...
  14. Question: Motion in 2-d

    by Nhatkiem
    Answers
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    1,151

    Actually my work there is correct. At least from...

    Actually my work there is correct. At least from my point of view. I found the time it took for the bullet to travel 5.6 m downwards. The angle at which the gun was pointed is critical. The gun is...
  15. Question: Motion in 2-d

    by Nhatkiem
    Answers
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    1,151

    a) the time an object spends in the air is...

    a) the time an object spends in the air is directly related to only its initial velocity in the y direction if you neglect air resistance and drag forces.

    The formula I would use is
    ...
  16. Answers
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    Well standard deviation is represented by the...

    Well standard deviation is represented by the function

    s=\frac{sqrt{\sum_{i=1}^n(x_i-\overline{x})^2}}{n-1}where \overline{x} is the mean, and x_i is the sample you are taking the difference of.
    ...
  17. Answers
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    A very good attempt ajone216. lets look at...

    A very good attempt ajone216.

    lets look at this equation. We want to find

    \frac{d}{dx}[x^3+2e^3]
    Equivalently this is

    \frac{d}{dx}[x^3]+\frac{d}{dx}[2e^3]

    \frac{d}{dx}[x^3]=3x^2 This is...
  18. Answers
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    The kinetic formulas should be in your book, they...

    The kinetic formulas should be in your book, they allow you to represent motion as a function of time.

    The second formula is one of the kinetic equations available.

    Yo is the initial vertical...
  19. Question: Hard derivative

    by Nhatkiem
    Answers
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    1,009

    I am a little bit dissapointed as this question...

    I am a little bit dissapointed as this question was asked before and I provided the help you needed. If you were still unclear you shouldn't have made another post but rather asked more questions on...
  20. Answers
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    If only it was a pastry, more students would be...

    If only it was a pastry, more students would be interested in it:p.

    I've also heard that the pronunciation is "pee" not "pie" for \pi, sine we say "phee" not "fie" for \phi
  21. Question: Tangent Line

    by Nhatkiem
    Answers
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    822

    If your looking for the equation of the tangent...

    If your looking for the equation of the tangent line of g(x), it IS g'(x)

    however if you are looking for instantaneous slope, the equation will be constant, taking on the form

    x=g'(1)

    And...
  22. Answers
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    the function e^x does indeed have asymptotes...

    the function e^x does indeed have asymptotes (remember asymptotes are a way of explaining end behaviors of graphs). Whenever you hear or see the word "end behavior" or "asymptote", you should be...
  23. Question: Derivative

    by Nhatkiem
    Answers
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    1,361

    the derivative is the difference quotient as h...

    the derivative is the difference quotient as h approaches 0

    To find f'(x)

    You need to find what \frac{f(x+h)-f(x)}{h} and take the limit as h approaches 0.

    If your past the point of taking...
  24. Answers
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    Lets look at part a. Were looking for the angle...

    Lets look at part a. Were looking for the angle that gives the ball a flight time of 2 seconds. The only factor in flight time for projectile motion is the y component of your velocity.

    Therefore...
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    Of course the answer is right :p Anyway that...

    Of course the answer is right :p

    Anyway that was also the answer I got.

    Ideally you would imagine the object would have to be closer to the moon to feel no forces since the moon is smaller. So...
  26. Question: Definition woes

    by Nhatkiem
    Answers
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    995

    I just find it strange that the higher level math...

    I just find it strange that the higher level math I've been taking recently has pretty much on some level redefining the definitions of things I had already learn that have been carved neatly into my...
  27. Question: Definition woes

    by Nhatkiem
    Answers
    6
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    995

    Perhaps "constant" function was the wrong term,...

    Perhaps "constant" function was the wrong term, but rather a function whose slope is constant.
  28. Question: Definition woes

    by Nhatkiem
    Answers
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    995

    Well I mean there is the little lies, since...

    Well I mean there is the little lies, since technically complex numbers lie in a separate number plane all together, but I can't see the point of how practicality in the whole linear vs constant...
  29. Question: Definition woes

    by Nhatkiem
    Answers
    6
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    995

    Definition woes

    I'm taking a trip back to the beginnings of algebra, when we were told that a linear function is of the form

    y=mx+b. But this can't be true, because I came across a definition for linear...
  30. Answers
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    Image needs to be rotated 90 degrees, doesn't...

    Image needs to be rotated 90 degrees, doesn't change anything but direction though.:o
  31. Answers
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    Lol, the original problem kept biting me in the...

    Lol, the original problem kept biting me in the butt because my radius kept canceling each other out haha. But you have a point, the answer will have to be 1 negative and 1 positive value, two...
  32. Answers
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    I'm sorry, I'm having a lot of problems...

    I'm sorry, I'm having a lot of problems understanding your question, are you referring to packing efficiency and the length of each side of the cube of aluminum?
  33. Answers
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    The vertex is just the local extrema of your...

    The vertex is just the local extrema of your graph, whether in this case it's a maximum or a minimum appears to be up to you. In other words from the point (1,-6), your graph should be parabolic in...
  34. Answers
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    I'm not sure what your doing wrong because I am...

    I'm not sure what your doing wrong because I am getting a negative and a positive answer. Make sure you are typing in everything correctly :confused:
  35. Answers
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    I forgot to say, If you know calculus, then just...

    I forgot to say, If you know calculus, then just take the derivative with respect to r, and solve it as an optimization problem.
  36. Answers
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    Gravitational force between two objects is...

    Gravitational force between two objects is explained as

    F_g=G\frac{m_1m_2}{r^2}

    where m is the mass of the two objects, G is the gravitational constant (6.673*10^-11) and r is center to center...
  37. Answers
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    Lets think about all the forces in play (since...

    Lets think about all the forces in play (since friction was not mentioned, I will not mention it as a force).

    The inclined plane is positioned 60 degrees, the only forces acting on George is...
  38. Question: Net Force

    by Nhatkiem
    Answers
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    960

    usually force is a vector, but the magnitude of a...

    usually force is a vector, but the magnitude of a force is just a scalar, so direction isn't something you'll have to worry about, yay!

    I will denote with sub n for net

    F_n=m_n*a

    or if...
  39. Answers
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    I believe what your posting is the difference...

    I believe what your posting is the difference quotient.

    if we have g(x)=x^2+x

    and the difference quotient asks for \frac{g(x+h)-g(x)}{h}

    Then the way I would go about it is inputing "x+h"...
  40. Answers
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    I'm not sure if I'm 100% correct about this, but...

    I'm not sure if I'm 100% correct about this, but I believe total voltage in a series is just the sum of the voltage. In other words the minimum voltage is the same as the maximum voltage because it...
  41. Answers
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    It's been happening more frequent as of late.

    It's been happening more frequent as of late.
  42. hmm I always thought the definition for...

    hmm I always thought the definition for minor/major axis were dependent one which ones were longer, meaning the definition of a and b were interchangeable depending on lengths:confused: Been a while...
  43. Question: Sample mean

    by Nhatkiem
    Answers
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    1,481

    Oh really.. lol I was getting annoyed at the...

    Oh really.. lol I was getting annoyed at the spaces not entering.. so.. periods haha
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    break up the inequality, and solve them like you...

    break up the inequality, and solve them like you would with algebraic equations with "x"s on both sides of the equation.

    solve for

    s_1=x+1<2x+7

    and

    s_2=2x+7<x+5
  45. Answers
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    Work a little differently :). Imagine superman...

    Work a little differently :).

    Imagine superman flying to and from a wall and a train moving 220 km/hr towards the wall from 275km away . That should simplify things. (2 objects moving towards each...
  46. Answers
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    In this situation you know a pattern of...

    In this situation you know a pattern of information

    Side angle side!

    Use the law of cosines to figure out the missing side

    c^2=a^2+b^2-2abcos(\theta_c)

    where c is the unknown length, a...
  47. the general standard form of an ellipse is ...

    the general standard form of an ellipse is

    (\frac{x}{a})^2+(\frac{y}{b})^2=1

    where a and b are the radii of your major and minor axis.:)
  48. Question: Sample mean

    by Nhatkiem
    Answers
    7
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    1,481

    The mean of any sample is ...

    The mean of any sample is

    mean=\frac{sum.of.samples}{number.of.samples}

    Find the mean for both samples and take the difference.
  49. Question: Word problems

    by Nhatkiem
    Answers
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    938

    Use the form \frac{y_0-y_1}{x_0-x_1}=m to find...

    Use the form

    \frac{y_0-y_1}{x_0-x_1}=m to find the slope, where y0,y1 represents the number of adults, and x0, x1 represent the years since 1990.

    After minding m, choose a point and plug it...
  50. Answers
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    Another way I've seen double rates done is ...

    Another way I've seen double rates done is

    \frac{1}{r_1}+\frac{1}{r_2}=\frac{1}{r_n}

    if you do a bit of algebra work you get it into the same format as chris-infj posted. If you do it this way,...
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