Bike Definition and 189 Threads

Well I just got back from the bike show and it was great! I just thought I'd post a few pics here, hopefully some of you will be interested, at least I know Turbo will be :smile:

I need help badly! 1. A bicycle rider pushes a bicycle that has a mass of 13 kg up a steep hill. The incline is 25* and the road is 275 m long. The rider pushes the bike parallel to the road with a force of 25N. How much work is done by the force of gravity on the bike? 2. Your car has...

The rear wheel of a bicycle has a set of sprockets whcih vary in size. The chain hooks onto the sprockets, and when a pulling force is apply to the chain, the sprocket, hence the wheel turns. As any cyclist knows, when going up a hill, to maintain a constant velocity, it is better to use a lower...

The drawing shows a bike wheel resting against a small step whose height is h=0.120m. The weight and radius of the wheel are W = 25.0N and r = 0.340m. A horizontal force F is applied ot eh axle of the weehl. As the magnitude of F increases, there comes a time when the wheel just begins to...

Suppose you are riding a stationary exercise bicycle, and the electronic meter indicates that the wheel is rotating at 10.4 rad/s. The wheel has a radius of 0.507 m. If you ride the bike for 42.6 min, how far would you have gone if the bike could move? ok here is what i know my W (angular...

An exhausted bicyclist pedals somewhat erratically, so that the angular velocity of his tires follows the equation, ω(t)=(1/2)t - (1/4)sin(2t) where represents time (measured in seconds). There is a spot of paint on the front tire of the bicycle. Take the position of the spot at time to...

If you ever rode a bike, you might notice that trying to lift yourself up (while sitting on the saddle and riding) when traveling at high speeds is more difficult than when you are traveling at low speeds. Why is this? I think that the reason is more to do with the fact that when you lift...

Ok, I'm looking to buy a sport bike sometime in the next year (possibly two years, depending on university financials, some things have to come first afterall). I intend for it to be my primary transport 80-90% of the time. Incidently, it will be my first bike, and no I don't have the license...

To visit America and tour on my bike, if i had three weeks how many of you could i visit, (if you would even entertain the idea) would any of you offer me a place to doss down, a barn or out house would do, could i even get through customs? if i kept my big mouth shut and did not insult a...

Why is riding a bicycle easier (requiring less work) than walking, say at natural walking speed?

This Bike is a Pipe Bomb... This just seems ridiculous. The older story of a similar incident is even more so ridiculous though... And here's a pic and description of the sticker... http://www.stickergiant.com/page/sg/PROD/bicycle/mcs134?utm_source=froogle Who the heck is going to...

why a bike can balane when the wheelse don't rotate but it is unstable and when the wheeles rotate it will be stable equilibrum it means that the maximum of E-x diagram change to it's minimum

Just bought a new recumbent bicycle - full lawn chair type seat and pedals directly forward, with legs now horizontal. Tried no-hands riding, but failed repeadedly. The steering seems fine, just can't seem to balance this critter for some unkown reason, like i can on my mountain. The...

On standard road bike tires sometimes they put a soft/flexible kevlar layer to protect against puncture. I was thinking about putting in in hard/rigid kevlar layer to also protect against puncture, I know that this will make the actual tire stiffer and harder to deform, which could be a bonus...

Hey guys, thanks for all the help with fixing my bike, I still haven't got rid of the clicking because I haven't bought a crank puller yet, but I'll get to it soon. I thought since I was getting into the whole bike fixing mood that I might want to start upgrading things. here is my bike. What...

I just read that a bicyclist is supposed to ride on the right side of the lane (with traffic), and not on the sidewalk. Why is this? Personally I ride on the sidewalk all the time, as it feels more comfortable, and safe. However, I have always ridden a 20" bmx bike, so I usually do not go...

I thought we could do with a little humor. :biggrin: "President Bush collided with a local police officer and fell during a bike ride on the grounds of the Gleneagles golf resort while attending a meeting of world leaders Wednesday." http://abcnews.go.com/International/wireStory?id=914274

Ok, hands up who can remember, filling up with petrol, takeing your girl, "oops" lady friend to the pictures then having a fish and chip supper, all for 10 bob. Well that's about the time we had our first tv, BBC only, when ITV came along we had a converter by the side of the tv...

I have been toying with the idea of modding my road bike (pedal) for increased aerodynamicy; for starters of adding a small fiberglass shell on the front to channel the air around my legs and lower bike frame possibly eventually adding a shell to control the flow around my shoulders more does...

ok, my friend and i were riding bikes, when he fell, getting scrapped up knees, and a scraped chest when he hit the handlebars with his rib. he was able to ride to my house (1.5 km). when he got there, we cleaned his wounds with hydrogen peroxide (H2O2) and bandaged them. then, he got woozy...

Q. A biology student rides her bike around a corner of radius 24 meter at a steady speed of 8.3 m/sec. The combined mass of the student and the bike is 87 kg. The coefficent of static friction between the bike and the road is μs = 0.39. What is the magnitude of the total force between the...

A biology student rides her bike around a corner of radius 24 meter at a steady speed of 8.3 m/sec. The combined mass of the student and the bike is 87 kg. The coefficent of static friction between the bike and the road is μs = 0.39. a) If she is not skidding, what is the magnitude of the...

A bike wheel, of mass 1.36 kg is placed at the end of a rod 0.530 m in length, which can pivot freely about the other end. The rod is of negligble mass. The wheel is turning rapidly such that it has an angular momentum of 10.8 kgm^2/s. At what angular speed does the wheel revolve horizontally...

G'day everyone! This is my first post here, so hello to everyone. :smile: Anyway, I'm having some trouble with my physics (yr12 in Australia, which is final year high school). :confused: What are the forces acting on a bike that is banking as it travels on a circular road? Is the...

[FONT=Tahoma]undefinedundefinedundefined wat kinda material is best 4 da forks of a mountain bike? or were can i find info? quick replies please

hey, I am doing a survey for my bike alarm. How thick is the biggest frames on your bike, and how thick is the smallest frame? a reply would be very helpful. Thanks

I am going to attach a bike alarm to the bike using a jubilee clips. Is this a good idea? Are the adjustable around the frame? Does anyone have any other alternative suggestions? If the jubille clips are a good idea, are they available in plastic coated form?

Here's the Prob: What is the smallest raduis of an unbanked curve around which a bicyclist can travel if her speed is 18 mph and the coefficient of static friction between the tires and the road is .32? This was the response I got: For the second one: draw a freebody diagram, label...

I have made a case for my bike alarm out of ABS. I have drilled holes to allow sound from the buzzer to come out. Now, the problem is, if it rains, my alarm will get damaged because the water would flow through the holes into the circuit. The ABS is waterproof already, but how can I prevent the...

Hey everyone...I need work out how big my bike alarm has to be to fit under a bike saddle...so could you please tell me by how far you move your saddle up, so you can ride your bike properly and sit comfortably?...This can be done by measuring the length of the metal rod that holds the saddle...

I have a circuit that I am going to use as a bike alarm. The problem is that I will need a tilt switch which acts like a push-to-break switch :confused: ...is it possible to get a switch like that? ...or are there any alternatives?please reply...

I have a circuit that I am going to use as a bike alarm. The problem is that I will need a tilt switch which acts like a push-to-break switch :confused: ...is it possible to get a switch like that? :rolleyes: ...or are there any alternatives?please reply...

Hi...I am making a bike alarm for my Design and Technology coursework...to design my alarm I first need to make a market research, so I can get peoples opinions about how the alarm should look like... could you please download the questionnaire, answer it and send it back to to me at...

Check this out. I’ve never seen anything like it. Says on their webpage that it actually changes with heat. I’m hoping someone in here has heard more or tried it. My car is next…… I got to have this……. http://www.alsacorp.com//xposure_bike.htm

ive been wondering... why is it so much easier to maintain our balance when the bike is moving? is it something of centripital (sp?) force, just like when you sit on a spinable chair and spin a bike wheel and it turns you in circles. (does the force of the spinning force you downward?)

Simple question really, why is it easy to balance on a bike when you are moving fast but hard to balance when you are going slowly or are stopped?

Moments of inertia Help A wheel is formed from a hoop and n equally spaced spokes extending from the center of the hoop to its rim. The mass of the hoop is M, and the radius of the hoop (and hence the length of each spoke) is R. The mass of each spoke is lower case m. A. Determine the...

A biology student rides her bike around a corner of radius 30 meter at a steady speed of 8.1 m/sec. The combined mass of the student and the bike is 89 kg. The coefficent of static friction between the bike and the road is ìs = 0.32. a) If she is not skidding, what is the magnitude of the...

You have a bike tire with X mass and Y moment of inertia. You hold the tire on a vertical plane just slightly above the ground. You then spin it to give it Z amount of angular momentum. If you were to let the tire drop to the ground, what would its acceleration and final velocity be? (not...