Recent content by JustRandy

  1. J

    Power needed to accelerate a chain.

    Well, all I'm really getting at here is whether I should spend more money to buy a chain that weighs about 1/2 a pound less than a cheaper chain. The bike is not moving... The idea is to just break the tires loose and slide. 3J doesn't sound like much. The engine has around 20HP.
  2. J

    Power needed to accelerate a chain.

    So, is it just that easy? Since the chain is connected we can treat it all as if it were going in a straight line? We don't need this moment of inertia stuff? Because I was starting to get some weird figures using those other equations: Ig = (Mc*r1^2)/2 + (Mc*r2^2)/2 Pc = (Ig*alpha) x...
  3. J

    Power needed to accelerate a chain.

    I'm confused about the angular acceleration. Wouldn't that be the same as the linear acceleration since everything is connected?
  4. J

    Power needed to accelerate a chain.

    Well, if that's the worst you do on a bad day, you must be a REAL wizard once you get warmed up! Anyway, so, Ps = (.4536Kg * 3.7998 m/s/s) * (3.7998 m/s/s * 1 second) = 6.5493 Nm/s Ok, that looks like power, lol. Wait... Would the mass Mc be the mass ONLY of the part of the chain going...
  5. J

    Power needed to accelerate a chain.

    Nevermind my scribblings... I think I was barking up the wrong tree anyway. :D You make it look pretty straight forward. The only thing I don't understand is alpha and wo? So, if the tire is spinning at 20 mph, then (20 miles / 60 min) * (5280 ft / 1 mile) * (12 in / 1 ft) * (1...
  6. J

    Power needed to accelerate a chain.

    I'm not a student, but this seemed like the correct place to put a question. I need to know how much power it takes to accelerate a motorcycle chain weighing 1 pound in 1 second to a speed that would equal 20mph at the wheel from a dead stop. The wheel has a diameter of 20 inches. The...
  7. J

    Odds of Street Address Digits Summing to 11

    Ok, here's what I've done. I used excel to find the number of times you could draw a number that sums to 11 from a lot of 2,3,4,5 digit numbers. For 2 its 8/90 or 9%. 3 its 61/900 or 7%. 4 is 279/9000 or 3%. 5 is 991/90,000 or 1%. I assume we can just add those numbers together and get...
  8. J

    Odds of Street Address Digits Summing to 11

    Boy,,, I'm really burning the neuro-glucose on this one just trying to understand what you guys are talking about. And coming from a background of being handed math award after award, 8 courses of calculus and an engineering degree... I'm feeling pretty stupid about now. However, being not so...
  9. J

    What Would You Think About 11s in ICU?

    Boy Russ, of all things to comment about in my last post your still stuck on the amount of time I spent at the hospital? :) But first,,, 10x10x10x10 = 10,000. 10,000(address)x10,000(phone)x800(date)x20?(rooms)=1,600,000,000,000. But that's not the true odds because there are many other...
  10. J

    Odds of Street Address Digits Summing to 11

    Oh yes, good point... I didn't see that. Now that I think about it, there are other complicating factors like a/b addresses and odds n evens being on the north or south side of the street. What if we just assume the leading digit is eqaully distributed? If we have 9999 things, wouldn't the...
  11. J

    What Would You Think About 11s in ICU?

    Thank you! Its ok, I understand you guys have to deal with all sorts that come here posting who knows what in an effort to change the world. Thanks again!
  12. J

    What Would You Think About 11s in ICU?

    Thanks a lot Moonbear! I appreciate that! Let me start off by saying its funny you should mention 4 because he was on the 4th floor of the hospital that he was transferred to (thus would have a 4 in the room number) and today is the 14th, LOL. That's meant to be funny so all you serious guys...
  13. J

    Odds of Street Address Digits Summing to 11

    What are the odds of anyone person having a street address where the digits sum to 11? I figure a couple of asumptions have to be made like, the number of digits in an address fit in a normally distributed curve where the mean is around 3 or 4 digits, and everyone is equally likely to have...
  14. J

    What Would You Think About 11s in ICU?

    Haven't seen the movie, but I'm going to rent it sometime. I struggled to find an 11 in many of the names of my friends and family and no matter how I arranged the names with nicknames, middle names, etc, I could not find a combo that worked. Therefore, I cannot find a pattern for anything I...
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