Recent content by leetramp

  1. leetramp

    News 9th Grader Arrested for Bringing Homemade Clock to School

    If you'd like to add your voice to an online petition asking the Principal and Police Chief to apologize, you can do so here: https://www.change.org/p/irving-tx-schools-and-police-apologize-to-ahmed-mohamed-for-criminalizing-science
  2. leetramp

    Why do we have both sine and cosine?

    I would say that sine, cosine, and tangent are just ratios of sides of a triangle, thus we have three tables to look up on (oops, I'm showing my age). It's only when you get to the unit circle that you run into looking at "why three?"
  3. leetramp

    How to Determine Dimensional Formulae?

    The original question was: I never stated that energy in water molecules is different than energy due to position of objects (gravity) nor due to their relative speeds (kinetic), so please don't reply with sarcasm. Yes, you can simplify all units to their base SI units, and for the...
  4. leetramp

    How to Determine Dimensional Formulae?

    How do you measure the amount of energy is absorbed by an amount of water? You know nothing of time or distance, you just know that xkg of water heated up yoC, so it must have absorbed energy. We calculate the energy by multiplying the mass of water by the temperature change, thus the units of...
  5. leetramp

    How to Determine Dimensional Formulae?

    But this is where the concept of applying dimensions to energy can get pointless. Yes, you can break kinetic energy into the units kg*m2/s2, but what does this tell you about the amount of energy required to heat 1 ml of water 1oC? The units of that would be kg*oC. Energy can be expressed...
  6. leetramp

    Find Total Force & Direction on Sliding Block | Inclined Plane Help

    Often people get confused by problems with just a variable for the mass. If "m" throws you off for mass, go ahead and plug in 10 kg, 50 kg, or whatever number turns you on. Then when you've solved it, just divide by that number to get the value in terms of "m". If the style of the answers to...
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