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# How fast should he be?

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Let me give you these figures first:

-The loop is 4 lanes wide.

-It's diameter is 60 feet.

-It's circumference is 188.4 feet.

-The rider is riding a 2000 CC motorcycle.

How fast would he have to go to get through the loop?

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Through the loop is easy and you can do that at any sensible speed.

Round the loop is a bit more of a question.

Incidentally, shouldn't it be 188.5 feet?

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No, because I calculated 188.4 feet.

What do you mean by any "sensible" speed?

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If you try to ride a motorbike at a very low speed- like walking pace or lower, it is difficult to maintain balance (unless you have a side car).

And above about 100 MPH it's quite difficult to control.

Anywhere between those speeds would be sensible.

60*3.141592 =188.4955.....

Rather nearer to 188.5 than 188.4

Now you need to find out the difference between going through a loop and going round a loop.

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Can you describe the 'loop' better, and what the bike is doing in/on/around it.

Is the loop like a circular running track on the ground? is it a wall-of-death type loop? is it a vertical loop? How wide is one lane, how heavy is the bike, why does it have such a huge engine?

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I mean this kind of loop:

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I found this rather useful site which deal with exactly the question you posed.

http://physics.info/centripetal/practice.shtml

My maths skills are pretty poor, but i reckon the bike will want to approach the loop at about 50Kph and be doing about 20Kph at the top of the loop.

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Then if the bike was going 200 km/h, how long would it take to exit the loop?

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