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velo90

Friday quiz

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The Track isn't 90 miles long... it's a track, more like 1 1/2 miles around. AND... it would be more like two minutes per lap @ 90 Mph, not hours...

I still say it's 270 Mph...


No, no, no...the point is, once you're halfway there, your overall average speed is limited by your average speed at the momentx2
Or, if you do one third of the way, your overall average speed can never be three times your average speed at that point. And so on...

.

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So, 810 miles an hour it is? Good. Done. :P;):D

Kelly



No.

Whatever time is required to go 16 laps at 180mph is exactly the same as the time take to go half the distance (8 laps) at half the speed (90mph). So at the end of the first 8 laps (of whatever length they are) he has already used up the entire time available. So NO time is left for the remaining 8 laps. Hence it doesn't matter if he goes at the speed of light, he still can't do it.

(I hope you're not just being annoying).
...

The only sure way to survive a canopy collision is not to have one.

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so assume a different length track. It doesnt matter what the length of the track is - the answer is still the same.

Go on - pick a length of track and we'll work through the equation together (ignore the rest of the chatter).

If you look above I agreed with you initially untill I worked through the equation and realised why the answer is "impossible".

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so assume a different length track. It doesnt matter what the length of the track is - the answer is still the same.

Go on - pick a length of track and we'll work through the equation together (ignore the rest of the chatter).

If you look above I agreed with you initially untill I worked through the equation and realised why the answer is "impossible".



My brain is being stubborn on this hungover Friday morning....

It'll all make sense later...


Blog Clicky

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So, 810 miles an hour it is? Good. Done. :P;):D

Kelly



No.

Whatever time is required to go 16 laps at 180mph is exactly the same as the time take to go half the distance (8 laps) at half the speed (90mph). So at the end of the first 8 laps (of whatever length they are) he has already used up the entire time available. So NO time is left for the remaining 8 laps. Hence it doesn't matter if he goes at the speed of light, he still can't do it.

(I hope you're not just being annoying).


So who won, the guy driving 90 mph or Michael Schumacker?:P
Sparky
My idea of a fair fight is clubbing baby seals

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Think about it this way:
Forget how much distance he has left. How much TIME does he have left?
Basic formula for speed:
v=delta d / delta t

so for time
t=d/v

He wants to go d distance at v speed. He's already gone (.5 x d) at (.5 x v).

Time he needs to complete the race at the goal speed is:
t1 = d/v

Time he's already used is:
t2 = .5d/.5v

the .5's cancel out so t1 = t2, so he's used up all his TIME with half the distance to go.

The DZ example is great. Say it's 100 miles from where you live to Hollister, where there's boobies, jumping, boobies and jumping, beer, boobies, boobies and beer (in that order) waiting, but they'll only wait an hour.
You need to average 100 mph to get your beer, boobies and jumping (not in that order).
Bonebrain asshat traffic in SF and the Peninsula has you stuck at 50mph for the first half of the drive, clear down to yuppieland Los Gatos. How long did it take to get 50 miles at 50mph?
How much time do you have left to get to H-town?

Mmm that beer is good. And what a great day of jumping! And look at all the boobies. Where's AndyXXL? He said he'd be here, the flake. Who cares? More for the rest of us.

(>o|-<

If you don't believe me, ask me.

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Traffic lights (which are an invention of Satan) have the worst possible effect on your trip time, because you are completely stationary while waiting, and the increased speed when you encounter a green one can never compensate for the time you waste at red ones.



Most traffic lights are timed to function on an average speed of 35mph. If everyone travels at that speed, you will keep hitting green lights.

Of course, ones that are timed for 35 are timed for 70 also. :ph34r:

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DSo you think the $400 billion price tag for an AFF course is acceptable then?



You could set up your own governing body which you had sole rights to MPA, Martian Parachute Association so you could dictate all the rules. Cool...B|
I'm drunk, you're drunk, lets go back to mine....

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See Attached Zip file (with excel and html file) to get the numbers.

The solution in the attached spreadsheet assumes that the average lap time for the first 8 laps was calculated over the entire 8 laps. The max speed of the car was limited to 96mph which over 8 laps yields an average speed of 90mph (assuming the race started at 0mph). This also models an engine problem that limits the car to some arbitrary max speed.

In this scenario to finish the race with an OVERALL RACE average of 180mph, our friend Schumacher would have to make his car do 281.6mph.

That's my final answer.

OBTW, track distance does not matter as long as the track distance stays the same throughout the race, which is ideal as autoracers usually frown upon having to slow down for construction workers.

Blue Skies!
-kjarv

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How much time do you have left to get to H-town?

Mmm that beer is good. And what a great day of jumping! And look at all the boobies. Where's AndyXXL? He said he'd be here, the flake. Who cares? More for the rest of us.



You had me until the end, but there's one problem...

I always bring the beer!


Blog Clicky

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it seems like speed is getting confused with time here...

90 miles per hour is a measurement of speed
an hour is a measurement of time
one really doesn't have a whole lot to do with the other.

if the driver in question has an infinite amount of time to finish the race, there is no reason why he couldn't up his speed on the last half of the race to make his average speed equal to 180 miles per hour.

the race has a finite distance, not a finite time period.

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it seems like speed is getting confused with time here...

90 miles per hour is a measurement of speed



90 miles per HOUR. Speed is a measurement of distance and time. Once you start talking about speed, you are talking about time. See Kallends last explanation above, seems the clearest one posted in explaining this.

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Example: it is a Baja offroad race. 90 mile lap.

16 laps is 1440 miles.

To average 180 miles per hour, his time would be 8 hours. 1440miles/180 = 8 hours.

He just did 8 laps (720 miles). At 90mph, he spent 8 hours to go 720 miles.

To average 180mph, he would have to complete 1440 miles in 8 hours. He has already driven 8 hours.

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Hence it doesn't matter if he goes at the speed of light, he still can't do it.

(I hope you're not just being annoying).



I thought she was being pert at that point :S.

But if you go the speed of light, then does it take any time? If the guy holding the stop watch is standing at the finish line, then it doesn't take any time to complete the last bit from his perspective. (but only if it's a straight track - not likely since it's called 8 'laps')

...
Driving is a one dimensional activity - a monkey can do it - being proud of your driving abilities is like being proud of being able to put on pants

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it seems like speed is getting confused with time here...

90 miles per hour is a measurement of speed
an hour is a measurement of time
one really doesn't have a whole lot to do with the other.



Hello? Speed is a ratio of distance versus time. Speed and time absolutely have a LOT to do with each other. Have you ever noticed that speed is indicated in such units as miles or kilometers per HOUR, meters or feet per SECOND, and (rarely) furlongs per FORTNIGHT?

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if the driver in question has an infinite amount of time to finish the race, there is no reason why he couldn't up his speed on the last half of the race to make his average speed equal to 180 miles per hour.

the race has a finite distance, not a finite time period.


He wants to finish with a certain average speed. That means he must cover the distance in a certain time. By specifying a distance and speed, you infer a time.

(>o|-<

If you don't believe me, ask me.

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But if you go the speed of light, then does it take any time?



It takes no time, so it would work, but there is one problem. Remembering that space and gravity bend light, your headlights would reach the edge of the universe and wrap around. They would then be shining in your rearview mirror, which really annoys me.

I would think someone was tailgating me, have road-rage issues, start weaving while flipping that tailgater off, and wreck. So, even though the equation works for conditions where time equal zero, it just wouldn't be prudent. :ph34r:

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***It takes no time, so it would work, but there is one problem. Remembering that space and gravity bend light, your headlights would reach the edge of the universe and ...So, even though the equation works for conditions where time equal zero, it just wouldn't be prudent. :ph34r:



:D:D

yeah, it's important to think of practicality when going superlumin.., supralimin..., supperlemonal....

er, fastert than light.

...
Driving is a one dimensional activity - a monkey can do it - being proud of your driving abilities is like being proud of being able to put on pants

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