Recent content by mbigras

  1. M

    LED/IR Pair for Leaky Faucet Experiment

    thanks for the input it led me to this site which seems useful http://www.glacialwanderer.com/hobbyrobotics/?p=11
  2. M

    LED/IR Pair for Leaky Faucet Experiment

    Hello Friends, I'm building a version of the leaky faucet experiment. Which is to say, I'm going to measure the period of water dripping out of a valve. To measure the event of the droplet falling I want to use an LED/IR pair. My understanding is that these things are basically like super...
  3. M

    Physics/Mechanical senior project brainstorming

    thanks for the input. This lead me to some interesting tutorials on vibrational analysis with solid works!
  4. M

    Physics/Mechanical senior project brainstorming

    I'm studying Physics for a B.S. but intend to pursue a masters in ME. Next year I'm going to start my senior project in physics but would like to start doing some research and brainstorming as soon as possible. What I'm trying to do is choose a project that can provide the means to bring all...
  5. M

    Conceptual question about FBDs and KDs

    thanks for the response. I was reading through the book section 16.7 on page 1048 addresses my confusion. AlephZero also said it. The key difference between 16.3 and 16.4 is that 16.3 is a "system of rigid bodies" with one member in fixed axis rotation which explains why we only see the couple...
  6. M

    Conceptual question about FBDs and KDs

    I'm looking at example 16.3 and 16.4 in Beer and Johnson vector mechanics dynamics. It seems that you can draw the forces in your FBD as "effective forces" on your KD (kinetic diagram). I'm confused about how I should choose to draw the effective forces at the centroid G or to draw them where...
  7. M

    Decide if a function is C1

    Homework Statement Decide if the function is C^{1} or just differentiable f(x,y) = \frac{x}{y} + \frac{y}{x} Homework Equations "A function whose partial derivatives exist and are continuous is said to be of the class C^{1}." Vector Calculus Marsden and Tromba p. 114 The...
  8. M

    Moment of inertia of triangle about centroidal axis

    Thank you haruspex, that was the missing piece of information! I can break up the triangle into two triangles and apply information in the included figure to each. Thanks also steamking for the reminder, winter break is around the corner and there will be time spent trying to wrap my mind around...
  9. M

    Moment of inertia of triangle about centroidal axis

    What I'm saying is I don't know how to do that. The situation is this: I know the moment of inertia with respect to the x-axis and with respect to the centroidal x-axis because its in the table. Now based on symmetry you can apply the definition of the moment of inertia to calculate the moment...
  10. M

    Moment of inertia of triangle about centroidal axis

    I think this picture describes where I'm trying to go with this question. Notice that I'm assuming that this triangle's "regular" y-axis is the same as the centroidal y axis. I can't explain why I think this except that it seems like that's how it should be because of symmetry. I'm not sure what...
  11. M

    Moment of inertia of triangle about centroidal axis

    I was going to put it right down the center so I_{y} = \overline{I}_{y} but I'm not sure what do to now. What I really want is \overline{I}_{y} so i can use the parallel axis theorem
  12. M

    Moment of inertia of triangle about centroidal axis

    It seems like the key is that for the y-axis all you do is switch the location of b and h. So what could be next to the triangle in the included figure is: \overline{I}_{x'} = \frac{1}{36}bh^{3}\\ \overline{I}_{y'} = \frac{1}{36}hb^{3}\\ I_{x} = \frac{1}{12}bh^{3}\\ I_{y} =...
  13. M

    Moment of inertia of triangle about centroidal axis

    Homework Statement There is the moment of inertia about an x and a y-axis named, I_{x}, I_{y}. Then there is the moment of inertia about the centroidal x and y-axis named, \overline{I}_{x}, \overline{I}_{y}. Often we can look up these values in a table (like the figure included) and apply...
  14. M

    Archived Weighted least-squares fit error propagation

    Homework Statement Suppose we measure N pairs of values (xi, yi) of two variables x and y that are supposed to statisfy a linear relation y = A + Bx suppose the xi have negligible uncertainty and the yi have different uncertainties \sigma_{i}. We can define the weight of the ith measurement as...
  15. M

    Where Can I Find Texas Tower Data for Physics Experiments?

    I'd like to produce a plot that looks like Taken from page 86 of AP French's Vibrations and Waves. I'm searching for some good Texas Tower data. Can you recommend an archive of physics experimental data? Or what I'd like even more is a spreadsheet with some texas tower data.
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