Recent content by abro

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    Max Wire Temp: Calculating Equilibrium

    Say I connect a wire to a power supply with a voltage V. The wire is a cilinder with a total surface area A, and resistance R. The wire will get hotter and hotter, and the temperature will increase linearly, according to the equation R(T)=R(1+aT). It will give this heat off in the environment to...
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    Conservation of angular momentum problem

    Aha, there is also a familiar example with the conservation of moment, called the ballistic pendulum problem. In conclusion; (angular) momentum is always (!) conserved, but energy can be transformed into other forms of energy, but the sum is also conserved.?
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    Conservation of angular momentum problem

    * get 3J of heat
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    Conservation of angular momentum problem

    What about a solid ball that's sticky or something, will it suddenly get 3J of just because it hits a hanging rod with 5J?
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    Conservation of angular momentum problem

    But where does the 3J go?
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    Conservation of angular momentum problem

    I have been busy with rotating objects and I have a question which I don't understand. http://dev.physicslab.org/Document.aspx?doctype=3&filename=RotaryMotion_AngularMomentum.xml (last question of the page, about the clay on the rod) What I don't understand is that the clay has a kinetic energy...
    • abro
    • Thread
    • Angular Angular momentum Conservation Momentum
    • Replies: 8
    • Forum: Mechanics
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    2 Q's: EM radiation produced by positive charge

    Took me some time to get the applet running, but now I can grasp it. Thanks!
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    2 Q's: EM radiation produced by positive charge

    So when the charge moves up, the electric field moves up? The magnetic field move in a circle when it moves up, but it's in the other direction when moving up, that's the problem I run into.
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    2 Q's: EM radiation produced by positive charge

    With the picture I attached, you can find the EM graph aswell. What I don't understand about that graph is wether it's the direction or magnitude of the the field. I have tried understanding what the graph of a charge moving sinusoidally look like, but it's inconsistent with for example the...
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    2 Q's: EM radiation produced by positive charge

    I have 2 questions about EM radiation produced by an occilating electric charge. Q1: With graphs of electromagnetic fields, you can see that it contains an electric and magnetic component. What does these mean or give information about? Q2: By occilating the charge, you will get such a graph...
    • abro
    • Thread
    • Charge Electric field Em Em radiation Magnetic field Positive produced Radiation
    • Replies: 6
    • Forum: Electromagnetism
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    Creating an AC Circuit with 2 Light Bulbs & a Switch

    What I mean is that I thought it would require a lot of parts, but turns out it's that simple.
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    Creating an AC Circuit with 2 Light Bulbs & a Switch

    Thanks, thought a bit too difficult.
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    Creating an AC Circuit with 2 Light Bulbs & a Switch

    Hi I want to make a circuit with AC and 2 light bulbs and a switch. One light bulb will light when the switch is open, but will be off when the switch is closed. The other bulb will have the opposite effect. I tried to use transistors but that only works for DC current.
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    Building a Speaker with a Class AB Amplifier

    Thanks I think I understood it, the speaker has to be connected to the positive and negative terminals?
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    Building a Speaker with a Class AB Amplifier

    Back to your 2 power supply amplfier, is this what you mean't? It should work, I used Kirrchoffs rules and it should...
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