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Everything posted by FizziksGuy

  1. FizziksGuy

    Impulse and Momentum

    Excellent. How can you apply this to air bags in cars?
  2. I'd love to see how he'd do against pro soccer players in that goal. :beaten:
  3. Test post for Skimwords which includes the term eBay. eBay should be turned into a Skimword.
  4. Great analysis up to the conversion to mph... 279 in/sec is roughly 16 mph.
  5. Excellent! Should have sent a video camera home with you!
  6. Video highlights from the 2011 Irondequoit High School physics catapult competition.
  7. In my previous career as a microelectronic engineer, we regularly worked with a gas known as silane (SiH4), a pyrophoric gas, which means it ignites spontaneously in air. Even better, for safety reasons they kept it outside the building in a bunker, which I had a great view of from my office window. :livid: It's fun to look at some of the safety precautions used when dealing with pyrophoric gases... double contained lines, shut-off valves, etc.
  8. A brief walk-through of retarding (drag) forces as an assist for AP-C physics students.
  9. FizziksGuy

    Physics of a Full

    Our study of rotational kinematics and moment of inertia will play a big role in understanding the gymnast's rotations from a physics perspective. From a performance perspective, it looks like magic to me!
  10. NOT uncommon at all. Physics takes time to sink it (that's why we try to end units and leave a few days for problem solving / practice / sink in before pulling it all together on an exam). I spent five years as an undergraduate learning how to make transistors, but didn't understand how one worked until I was a senior... some things just need to stew and sift for a while. :-)
  11. FizziksGuy

    Freeze em

    nice... nothing says physics like blood and vomit on ice!
  12. The following is an actual question given on a University of Washington chemistry midterm. The answer was so "profound" that the professor shared it with colleagues, which is why we now have the pleasure of enjoying it as well. Bonus Question: Is Hell exothermic (gives off heat) or endothermic (absorbs heat)? Most of the students wrote proofs of their beliefs using Boyle's Law, (gas cools off when it expands and heats up when it is compressed) or some variant. One student, however, wrote the following: First, we need to know how the mass of Hell is changing with time. So we need to know the rate at which souls are moving into Hell and the rate at which they are leaving. I think that we can safely assume that once a soul gets to Hell, it will not leave. Therefore, no souls are leaving. As for how many souls are entering Hell, let's look at the different religions that exist in the world today. Some of these religions state that if you are not a member of their religion, you will go to Hell. Since there are more than one of these religions, and since people do not belong to more than one religion, we can project that all souls go to Hell. With birth and death rates as they are, we can expect the number of souls in Hell to increase exponentially. Now, we look at the rate of change of the volume in Hell; because Boyle's Law states that in order for the temperature and pressure in Hell to stay the same, the volume of Hell has to expand as souls are added. This gives two possibilities: 1. If Hell is expanding at a slower rate than the rate at which souls enter Hell, then the temperature and pressure in Hell will increase until all Hell breaks loose. 2. Of course, if Hell is expanding at a rate faster than the increase of souls in Hell, then the temperature and pressure will drop until Hell freezes over. So which is it? If we accept the postulate given to me by Ms. Teresa Banyan during my Freshman year--"...that it will be a cold day in Hell before I sleep with you."--and take into account the fact that I still have not succeeded in having sexual relations with her, then #2 cannot be true; and thus I am sure that Hell is exothermic and will not freeze. THE STUDENT RECEIVED THE ONLY "A" GIVEN
  13. The Official Unabashed Scientific Dictionary defines a transistor as a nun who's had a sex change.
  14. The following is a little known, true story about Albert Einstein (attributed to Paul Harvey). Albert Einstein was just about finished his work on the theory of special relativity, when he decided to take a break and go on vacation to Mexico. So he hopped on a plane and headed to Acapulco. Each day, late in the afternoon, sporting dark sunglasses, he walked in the white Mexican sand and breathed in the fresh Pacific sea air. On the last day, he paused during his stroll to sit down on a bench and watch the Sun set. When the large orange ball was just disappearing, a last beam of light seemed to radiate toward him. The event brought him back to thinking about his physics work. "What symbol should I use for the speed of light?" he asked himself. The problem was that nearly every Greek letter had been taken for some other purpose. Just then, a beautiful Mexican woman passed by. Albert Einstein just had to say something to her. Almost out of desperation, he asked as he lowered his dark sunglasses, "Do you not zink zat zee speed of light is zery fast?" The woman smiled at Einstein (which, by the way, made his heart sink) and replied, "Si." And know you know the rest of the story.
  15. Guess what... November 1st starts the annual month-long NaNoWriMo (National Novel Writing Month) extravaganza. Amateur and professional writers across the world will struggle to write 50,000 words during the month, with the support and assistance of thousands of others from the NaNoWriMo.org website. The reason? One month to write 50,000 words is a challenge, and that challenge will keep you moving forward in your writing, saving edits and redrafts for later. Join us and see what you can do! http://youtu.be/miBhmLA62O4 www.NaNoWriMo.org
  16. A short video walk-through of the angled projectile motion worksheet, with full solutions. http://youtu.be/aru4jPpLMCk
  17. More algebra-based practice problems around projectiles launched at angles. Video and audio. http://youtu.be/aru4jPpLMCk
  18. Attached please find a short video walkthrough of your horizontal projectiles homework assignment.
  19. A brief review of angled projectile motion analysis at the Regents Physics level. All problems neglect air resistance.
  20. A brief review of horizontal projectile motion analysis at the Regents Physics level. All problems neglect air resistance.
  21. Ahhh, so by analyzing the distance, time, and velocity, we can verify whether it could have actually occurred or not? I like it... sounds like physics, and something we should do!
  22. Great job folks... what are some ideas that could reduce the amount of error in the experiment?
  23. The key here is realizing the force applied is horizontal... then, using the data you gave me, you can put it all together so your answer looks something like this!

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