ATAR Notes: Forum

Archived Discussion => 2011 => Mid-year exams => Exam Discussion => Victoria => Physics => Topic started by: pi on June 17, 2011, 09:27:08 pm

Title: 300kg cyclists
Post by: pi on June 17, 2011, 09:27:08 pm
Is that even remotely possible? Especially at those speeds and incline. What a tank, albeit a morbidly obese tank.

In a post-mortem discussion, we concluded that the bike had a lead frame, and the dude on it was very fat wearing armour (like from knights). But that makes it pretty hard to pedal at like 15m/s... Any ideas?

Title: Re: 300kg cyclists
Post by: b^3 on June 17, 2011, 09:30:04 pm
if they changed it to a motorbike with a small engine capacity it might work, and 15m/s is about 54km/h so, cyclist no, motorcyclist probably.
Title: Re: 300kg cyclists
Post by: pi on June 17, 2011, 09:31:07 pm
if they changed it to a motorbike with a small engine capacity it might work, and 15m/s is about 54km/h so, cyclist no, motorcyclist probably.

But even that isn't 300kg! That is fricken HEAVY!
Title: Re: 300kg cyclists
Post by: pi on June 17, 2011, 09:41:43 pm
So the dude probably looked like this:

(http://eviltrancetwins.com/wp-content/uploads/2010/03/Fat-Guy-In-Spandex.jpg)

Or maybe even worse?
Title: Re: 300kg cyclists
Post by: b^3 on June 17, 2011, 09:45:20 pm
fair point, considering the top motor racing class of bikes, weighs about 165kg plus say 60-70kg for the rider so total mass of say 230kg. so ok they are pushing it.

If we add a sidecar and another rider we might get there, but can you imagine a racing bike with a side car going over 54km/h? just a thought.
Title: Re: 300kg cyclists
Post by: pi on June 17, 2011, 09:51:01 pm
fair point, considering the top motor racing class of bikes, weighs about 165kg plus say 60-70kg for the rider so total mass of say 230kg. so ok they are pushing it.

If we add a sidecar and another rider we might get there, but can you imagine a racing bike with a side car going over 54km/h? just a thought.

It might be impossible, even if the above guy was riding this stone bicycle:
(http://static.flickr.com/117/281387667_c7b19cf325.jpg?v=0)


Still not 300kg, thats only around 250kg total
Title: Re: 300kg cyclists
Post by: GuessWho on June 17, 2011, 09:51:44 pm
So the dude probably looked like this:

(http://eviltrancetwins.com/wp-content/uploads/2010/03/Fat-Guy-In-Spandex.jpg)

Or maybe even worse?

At a 48 degree incline? Impressive to say the least.
Title: Re: 300kg cyclists
Post by: pi on June 17, 2011, 09:53:57 pm
At a 48 degree incline? Impressive to say the least.

True, I can't even see how that guy fit into his clothes (or maybe, I don't want to see how he did it :P ). Even less likely with the stone bicycle...
Title: Re: 300kg cyclists
Post by: b^3 on June 17, 2011, 09:55:46 pm
what about the ventureone, partly both a car and bike but still, weighs 1200pounds which is 544kg and can reach speeds of up to 160km/h and well leans into the corner. http://www.dailymail.co.uk/news/article-439163/Is-car-motorbike-Actually-both.html
technically it is a (motor)bike
Title: Re: 300kg cyclists
Post by: b^3 on June 17, 2011, 09:56:42 pm
(http://img.dailymail.co.uk/i/pix/2007/02_03/robinBNPS2802_468x309.jpg)
Title: Re: 300kg cyclists
Post by: pi on June 17, 2011, 09:58:35 pm
^^Nice, maybe by 'bike' they meant 'carish-motorbike' ???

lol, imaging a really fat dude on a bike is still lolz though
Title: Re: 300kg cyclists
Post by: b^3 on June 17, 2011, 10:00:10 pm
ok then imagine him trying to get into that thing, let alone out of it.
Title: Re: 300kg cyclists
Post by: pi on June 17, 2011, 10:02:45 pm
ok then imagine him trying to get into that thing, let alone out of it.
;D Not possible
Title: Re: 300kg cyclists
Post by: b^3 on June 17, 2011, 10:04:42 pm
if we start with him in the seat and build the thing around him we might have a chance, but then thats still not getting in and out I suppose.
Title: Re: 300kg cyclists
Post by: ttn on June 17, 2011, 10:12:31 pm
Lol 300kg is still possible for a motorbike, especially for a heavy beast like the hayabusa.
Title: Re: 300kg cyclists
Post by: GuessWho on June 17, 2011, 10:16:59 pm
if we start with him in the seat and build the thing around him we might have a chance, but then thats still not getting in and out I suppose.
How do we get him up to 54km/h? Rockets?
Title: Re: 300kg cyclists
Post by: b^3 on June 17, 2011, 10:20:27 pm
could always do what they did to john strapp, attach him to a rocket sled and nearly detach his retinas. ended up surviving something like a 45g decceleration
(http://www.jet-fighter-rides.com/aaa/2009/07/g-force.jpg)
or he could always end up looking like jeremy clarkson in the aerial atom
(http://www.teamteabag.com/wp-content/uploads/2008/05/jeremy-clarkson.jpg)