Recent content by andrewchang

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    Calculating Charge of Radon Nucleus

    protons have a positive charge?
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    Do Inclined Plane Calculations Use Degrees or Radians?

    If you are using a calculator, then you must put it in radian or degree mode depending on which one your are using.
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    Magnitude of torque on a current loop

    \tau = NIAB sin \Theta N = number of loops I = current A = area of loop B = magnetic field theta = angle between loop and field
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    Calculating Ksp of salt (answer check)

    your first one looks right, but the F2 in the second equation will actually dissociate into two F- ions
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    Help with Diff EQ Integrals Using Trig Substitution

    you can simplify both of them to make it easier
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    Solving Momentum Questions: 4 Problems Explained

    to me, the first question looks like an energy problem...
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    Food Preservation: 100 Years of Developments

    Does anybody have any information on developments in food preservation in the past 100 years? I need to make a poster on it, but I can't seem to find any dates so I can make a timeline. I've googled "food safety" "food preservation" etc., but all the sites have more information on the...
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    How do I show that x^x->1 as x->0?

    use l'hopital's rule. if you have lim x log x then x log x is the same as [log x / (1 / x)]
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    Understanding Charge Distribution in a Circuit with Multiple Capacitors

    In addition, it would be better for RadiationX to learn how to do this on his/her own.
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    Understanding Charge Distribution in a Circuit with Multiple Capacitors

    When you do these kinds of problems, you need to understand how to simplify capacitors into equivalent ones. have you learned how to do that yet? parallel capacitors can be made into an equivalent capacitor by adding their capacitance, and series capacitors follow the same rule as resistors in...
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    Tutorial on Friction Coefficient Formulas & Applications

    did you see my post just now?
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    Tutorial on Friction Coefficient Formulas & Applications

    actually, it's the wrong answer. notice that the speed of the car is given in kilometers per hour, while your calculations are in meters per second. so, you should first convert the kilometers per hour to meters per second, and then do the problem
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    Tutorial on Friction Coefficient Formulas & Applications

    i don't know if it's the right answer, but if you only need 3 significant figures, you're going to need to get rid of the 8. Round to the nearest 10 and you get 1440 m. (which has 3 sigfigs)
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    Capacitors in series and parallel

    Do you understand the concepts behind parallel vs. series capacitors?
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    Mechanics - Elastic springs and strings

    If the mass pulls down with the force of mg, then the spring must pull up with a force equal to that. (it hangs without moving at 5L/3) Therefore, you can apply Hooke's Law to get the spring constant, which is what you were asking for.