Recent content by mibjkk

  1. M

    Young's modulus - calculating delta L

    Remember that when converting from square millimeters to square meters, you have to square the factor that you are changing by. Since 1mm = 0.001m, 1mm2 = 0.001m * 0.001m = 0.000001m2 Your problem is that you are dividing by 0.0005m2 instead of 0.0000005m2, so your answer is exactly three...
  2. M

    Work Done in Two-Dimensional Ramp Push

    By using vectors, you can break the problem down into horizontal and vertical components. You don't describe whether or not friction is considered in your problem. Is the ramp assumed to be frictionless? If it is, try calculating work using only the vertical component of your force vector...
  3. M

    Calculating Mass & Freefall Accel. on Planet X

    If I understand your question correct, you are asking: If an object weight 18.6N on X and 29.8N on B, and acceleration on B is 1.42g, find (a) and (b) You might want to try doing the problem yourself using the simple equation F=ma, or Force (Newtons) = Mass (kg) * Acceleration (m/s^2)...
  4. M

    Elastic energy stored in a shaft under torsion?

    I understand the idea behind Uk=Tθ/2, but where does the factor of 1/2 come from? From what I understand, the work done by a torque over an angular distance is given by \int Td\theta, integrated from 0 to \theta, which results in an equation for the energy put into the shaft being: U_{k} = T...
  5. M

    Elastic energy stored in a shaft under torsion?

    Homework Statement Consider a hollow drive shaft of length L, inner radius b, outer radius a. A constant torque is applied (we can assume one end of the shaft is fixed because we're applying a constant torque T regardless of the angular velocity of the shaft). We know material properties of the...
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