Recent content by Awatarn

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    How Do You Calculate the Third Force in Static Equilibrium?

    Solving problem is not that hard. You may use the cosine law and the sine law, but it might be lots of algebra. For me, I would like to write components of force in x and y direction. The force in each component must be canceled ( forces are balance) So you have two unknown variables ( F3 and...
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    Net Electric Field of 2 charged particles fixed to X-axis

    Almost correct except r in your equation r is a distance from the charge you are considering. So each r on the left side and right side of your equation should not be equal. One should be include the distance between two point charges.
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    Derivative of (2+3sinx)(4+5cosx)tanx

    Correct, good work
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    Need help with complicated algebra for graduate engineering course

    It's would be nice if you use LaTex. You might check your answer by using Mathematica. It's really useful program.
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    What are the allowed transitions in the pure rotational spectra of CO2 molecule?

    Never heard that Check it at http://en.wikipedia.org/wiki/Selection_rule
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    Projectile Problem: Find Acceleration of Missile to Shoot Down ICBM

    Your logic looks good. The first thing that I'm aware is your Xf equation. the initial velocity in x direction should have v_i cos(\theta) And an acceleration in that direction is zero.
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    Projectile motion of a cannon ball

    Your method is correct. I check your answer, but I got the initial speed is 48.8 m/s.
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    Differential Equation Help - Vibrating String

    There are more than one way to tackle this problem. First of all, you should find wave equation in string (without point mass). This equation will give you a general wave equation. Second, consider motion of the point mass by using Newton's equation. There are three force relevant to the mass...
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    Tension Problem: Two boxes with two ropes

    That looks good. You can check your answer in limiting case. When mass of the rope goes to zero, your answer gives the same result as massless rope.
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    Graduate Can Objects Move with Complex, Infinity Velocities?

    I try to answer your questions:
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    Undergrad Data Table help (for a wind tunnel (Lifting force etc.)

    You need to convert the unit of mass to kg to make a consistent. It may be easily for you to convert every unit into SI unit which mean [mass] = kg, [Force] = N = kg s^2 / m I'm not sure about your experiment so I can't answer your second question.
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    Undergrad Electron Splitting: What Happens When You Split It?

    An electron has no substructure. Unlike other composite system you cannot split it.
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    Undergrad Do Electrons Attract AND Repel?

    You're correct. The electron repels each other because of the same charge but attracts because of the gravitational force. Both kinds of force obeys the square law (force is proportional to \frac{1}{r^2}). Two things repelling or attracting depending on charge and mass of themselves.
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    Photon and the absence of longitudinal polarization

    Homework Statement What property of the photon is responsible for the absence of longitudinal polarization? Homework Equations The Attempt at a Solution I thought it is because of the presence of its angular momentum. Is it true?
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    Which Differential Equations Class Should I Take for Transfer Credit?

    I would agree to Poop-Loops's opinion to ask the new school. For my class, I had to take "Differential Equations and Linear Algebra" class when I was a freshman. This subject which is main subject for every student taught me in general idea. Then I enroll in "Differential Equation" class which...