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  1. L

    Help with a SDOF system, spring and base?

    oh sorry, (t - tau) would just be t, taking tau=o as the moment that it steps
  2. L

    Help with a SDOF system, spring and base?

    Homework Statement Homework Equations Maybe the step response equation? The Attempt at a Solution I don't really understand the difference between a and b, but he said part a was supposed to be quite easy. Is a just: mx'' = -k(x-y) - c(x' - y') or something along those lines...
  3. L

    Calculating a moment required, using radius of gyration and parallel axis theorem

    Okay, maybe it's best to do the last two bits in reverse order; if the tangential acceleration is 18m/s^2, and the radius is 1m, is the angular acceleration also 18 radians/s^2? Then is the moment: angular acceleration * the moment about the hip? And that's the final answer?
  4. L

    Calculating a moment required, using radius of gyration and parallel axis theorem

    Homework Statement Homework Equations radius of gyration: r = root (I/m) I = moment of inertia m = mass parallel axis theorem given above The Attempt at a Solution Okay, so I think the moment about CM is just m*0.24^2, but after that, I'm less sure. Is the moment about the hip just...
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