Recent content by russphelan

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    Measuring Relative Speed of Frames Using Spacetime Interval

    I meant to say that the speed of the frame in which the events happen in the same place is 0. The speed of the frame in which the events have a spatial separation is given by the distance measured between the events, divided by the time measured between the events, from that frame. Does that...
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    Measuring Relative Speed of Frames Using Spacetime Interval

    Thank you very much for the reply! It makes sense that velocity of the second frame is defined in this way. According to the first frame, the events have not moved at all, so their speed is 0. This is the system in which the events are at rest.
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    Measuring Relative Speed of Frames Using Spacetime Interval

    Hi all, Say two events happen in the same place according to one observer (1). They are separated in time by 3 years. According to another observer (2) that is moving relative to the first, the events are separated by 5 years. We can calculate, using the invariance of the spacetime interval...
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    Tension on a Rope Deflected by a Pulley: Differentials

    Hi all, first post here. I'm a junior Physics/Math double major at UMass Amherst, playing with some problems over the summer. I'll get right into it. A rope with constant tension T is deflected through the angle 2\theta_{0} by a smooth, fixed pulley. What is the force on the pulley? It is...
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