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Thread: Create 45 degree cut with the EXTRUDE function

  1. #11
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    Quote Originally Posted by AskBud View Post
    Before my math problem creates a life of its own, re visit post #9. The answer is hidden in "White" text. Just highlight the post and the solution appears!

    I don't want to hijack the actual purpose of the thread!
    AskBud
    I read your answer and it is incorrect in relation to the original question asked as there is no time element put into place for the 2 mile or 60MPH avg to take place in.

    60mph is a unit of speed (velocity), not time.

    For example, there is no limitation to somebody speeding up to 120mph to make up "time" before the 2 mile marker comes up.
    Last edited by bluecobra; 07-16-2012 at 12:26 PM.
    ~ Mark K

  2. #12
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    Forget all that, Mark - here's the REAL answer.....

    Recruit Superman to make the last mile - he can travel faster than the speed of sound, making time not only stand still, but go backward!!!!

    I gotta get a life.
    Livin' Life
    Lovin' My Carvewright

  3. #13
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    Nov 2007
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    Las Vegas NV
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    Quote Originally Posted by AskBud View Post
    Only as good as we teach them!

    Take this problem, and first solve it yourself, then give it to others.

    Situation:
    You have a 2 mile track, which a car must travel at an average speed of 60 MPH.

    Problem:
    If the goes the 1st mile going 30 MPH, how fast must it travel the 2nd mile?
    The answer is not 90 MPH!


    Answer:
    60 MPH gives you 2 minutes to travel the course. You used 2 minutes traveling 30 MPH the 1st mile. You are out of time! You can not make the goal!
    AskBud
    We will never know because it is a electric car and it can't go faster than 30mph
    Leo Davenport
    Enjoy Life Carve Something everyday

  4. #14
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    Quote Originally Posted by bluecobra View Post
    I read your answer and it is incorrect in relation to the original question asked as there is no time element put into place for the 2 mile or 60MPH avg to take place in.

    60mph is a unit of speed (velocity), not time.

    For example, there is no limitation to somebody speeding up to 120mph to make up "time" before the 2 mile marker comes up.
    Bud is correct. It is a matter of definition. The average of 30 and 90 is 60 as numbers but not as speeds. The average speed is defined as the total distance divided by the total time. It is not a simple number but a rate which involves time. To calculate average speed, you need a weighted average. For example, if I go at 30 mph for 1 hour and then at 60 mph for 2 hours, the average speed is

    ((1)(30)+(2)(60))/(1+2)=50.

    Note that this is just total distance divided by total time.
    Last edited by bergerud; 07-16-2012 at 02:04 PM.

  5. #15
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    Thought you guys would like to know that I've removed all traces of my foot from my mouth.

    I totally disregarded the basic fundamentals of physics, even reaffirming Bud's answer with my incorrect answer.

    Anybody care to point me in the direction of the line for crow pie?

    ...superman & electric cars huh?
    ~ Mark K

  6. Default

    Quote Originally Posted by bergerud View Post
    Bud is correct. It is a matter of definition. The average of 30 and 90 is 60 as numbers but not as speeds. The average speed is defined as the total distance divided by the total time. It is not a simple number but a rate which involves time. To calculate average speed, you need a weighted average. For example, if I go at 30 mph for 1 hour and then at 60 mph for 2 hours, the average speed is

    ((1)(30)+(2)(60))/(1+2)=50.




    Note that this is just total distance divided by total time.
    Seems to me that as the question was posed, to average 60 mph over two miles with the first mile at 30mph, the correct answer would indeed be 90 mph for the 2nd mile.
    If the question had been posed as averaging 60 mph over a two mile course with a two minute time limit THEN it would be impossible if you only did 30mph for the first mile.

    30mph for 1 mile and 90 mph for the 2nd mile would average 60 mph over the two mile course. It would just take 2 minutes and roughly 40 seconds to do. Similarly in a side by side drag race with both cars leaving the starting line at the same time and traveling the same distance, 1/4 mile, the slower car (speed) may win if it covers the distance faster (time).
    Since everyone agrees with Buds answer I must be making a mistake somewhere but I'm not seeing it.
    Last edited by TerryT; 07-16-2012 at 07:29 PM.

  7. #17
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    Quote Originally Posted by TerryT View Post
    Seems to me that as the question was posed, to average 60 mph over two miles with the first mile at 30mph, the correct answer would indeed be 90 mph for the 2nd mile.
    If the question had been posed as averaging 60 mph over a two mile course with a two minute time limit THEN it would be impossible if you only did 30mph for the first mile.
    2 miles at 60mph takes two minutes, so if you average 60mph over the two miles you HAVE to traverse the two miles in two minutes. The first mile at 30mph takes two minutes - anything more is going to keep the average speed under 60mph. 1 mile at 30mph followed by 1 mile at 90mph results in an average speed of 45mph. Two miles at exactly 45mph means each mile takes 1-1/3 minutes, or 2-2/3 minutes for the two miles. 2/3 of a minute is 40 seconds so total time is 2 minutes 40 seconds, which you have already shown is how long it will take to cover the two miles with the first mile at 30mph and the second at 90mph.

  8. #18
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    Terry: average speed is total distance divided by total time. It is not the average of the speeds! If I were to travel all day at 10 mph and then rip at 100 mph for 10 seconds would the average speed for the day be 55 mph?

  9. Default

    Thanks guys, I hate to seem stupid, I'm trying to understand, maybe it's just because of no sleep last night but I'm just not getting it yet LOL.

  10. Default

    I GOT IT!!! It just took awhile. Of course 2 miles in 160 seconds can't be an average of 60 mph. Geez
    Last edited by TerryT; 07-16-2012 at 10:34 PM.

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