Bicycle Definition and 308 Threads

I am a little stuck with angular velocity and I do not know where to start on this one question. A bicycle wheel has a diameter 60 cm. Determine its angular velocity in radians per seconds, when the bicycle travels at 20km/h Could somebody please help as to where to start Very much...

A bicycle pump contains air at STP. As the tire is pumped up, the volume of air decreases by 30% with each stroke. What is the new pressure of air (in atm) in the chamber after the first stroke, assuming no temperature change? Select the correct answer. a. 1.4 b. 0.7 c. 2.6 d. 0.9 e. 2 What...

Homework Statement A boy is riding a bicycle on a straight, level and smooth road. There is no wind. He accelerates to 15m/s, and then suddenly stops pedaling. What will happen? a) immediately begins to slow because of inertia b) slows because of inertia, but not immediately c) slows...

My dad gave me this riddle eight months ago, can anyone help? Why doesn't a bicycle fall over when its moving. P.S its not balance , as you can push it and it won't fall over for a while.

Since, the only reason we get tired and muscles wear out is b/c of lack of oxygen...if I drive the bicycle machine really slowly, and do all my word on it...(use it as a desk) Is that a bad idea?

I am planning to build a bicycle with mechanical regenerative braking. I am thinking of setting a spiral spring to wind during braking and use its tension to assist in climbing hills Would such a spring give me enough power for this? Are there any other alternatives? Is this feasible?? Any...

Homework Statement A professor holds a bicycle wheel rotating at 402 rev/min by a string attached to a weightless axle 20 cm from the wheel. The acceleration of gravity is 9.8 m/s^2. If all 7.5 kg of the wheel can be considered to be at its 53.6 cm radius, at what frequency in rpm does it...

Dear Gurus, I'm coding a microprocessor controller for a 0.1hp motor. to assist going up hill on a bike. But the RR equation seems strange I found the equations relating the bike losses, mechanical, rolling resistance , airdrag... with speed and hence horsepower and calories. Here...

In the "Nobel winning physicist takes on Global Warming' thread there were a few posts about bicycle use that I found interesting. I realized that I could use a bicycle rather than an automobile for about 90% of all my travel needs. Living in Portland, the public transportation system is...

2 questions. 1.when you're spinning wheel by its shaft, does the wheel have any kinetic energy while it's spinning?is it conserved?explain why. 2.does the wheel have any net momentum while it's spinning? is it conserved?explain why

Homework Statement How to calculate Lance Armstrongs power output/calorie consumption at 30 mph, 125 miles on level ground , no wind, 157 lbs plus 16lb bike? Homework EquationsWhat equations do I use? The Attempt at a Solution I'm 14 years old, where do I start

Homework Statement What power must a man of mass 85kg have to bicycle 850m up a hill, inclined at 5.2 degrees to the horizontal, at a constant speed of 15.6 m/s? The force of friction on the man and the bicycle is 175N parallel to the incline. Homework Equations Fnet=ma W=delta E The...

i got a new frame for my bike an attempted to swap all the parts (pretty brave i know). when i went to put the parts back the way they were not all fitted. i removed the forks and the handle bars, and now when coming to put them back, the long pin with the hex allen key part will not tighten up...

Homework Statement You are trying to raise a bicycle wheel of mass m and radius R up over a curb of height h. To do this, you apply a horizontal force F. What is the least magnitude of the force F_vec that will succeed in raising the wheel onto the curb when the force is applied at the center...

Homework Statement A bicycle has wheels with a diameter of .600 m. It accelerates uniformly and the rate of rotation of its wheels increases from 215rpm to 275rpm in a time of 24.3 seconds. Find the linear acceleration of bicycle. Homework Equations w =wi + alpha(time) The Attempt...

Homework Statement I wasn't sure if i was doing this problem correctly, if anyone could double check for me, that would be great! You ride your bicycle down a hill. Your total mass is 40 kg. At the top of the hill, your speed is 5 m/s. The hill is 20 m high and 200 m long. If the force of...

Homework Statement You ride your bicycle down a hill. Your total mass is 54 kg. At the top of the hill, your speed is 5 m/s. The hill is 1 m high and 101 m long. what is your speed at the bottom of the hill? Homework Equations The Attempt at a Solution PE= mgh (54)(9.8)(10)...

Homework Statement Coasting along at 7.10 m/s, a 60.0 kg bicyclist on a 7.60 kg bicycle encounters a small hill. If the speed of the bicyclist is 6.00 m/s at the top of the hill, how much work was done on the bicyclist and her bike? Homework Equations KEf-KEi=W .5mvi^2-.5mvf^2...

Homework Statement A 14kg bicycle is on a 12 degree incline. A tension scale is connected by a rope to both the rear wheel circumference and a metal bar that is extending the bicycle frame rearward. The line of the rope is at a 30 degree angle to the metal bar. What will be the reading on...

Homework Statement What will the scale read in these 2 examples? The incline is 12 degrees. The bicycle weight is 14kg. The cylinder weight is 14kg. Homework Equations Force of 2nd pulley 'arm' is 1/2 weight Force on incline is force X sin(angle) The Attempt at a...

Homework Statement A bicycle has 30cm radius tires with gear and pedal dimensions as shown. IF the maximum vertical force that a 70kg rider can exert is equal to his/her body weight, what is the horizontal force that can be exerted on the ground by the rear tire...

Bicycle "Jet" Backpack http://www.netscape.com/viewstory/2006/10/04/propeller-propulsion-to-use-with-your-bicycle/?url=http%3A%2F%2Fwww.kirou.com%2F2006%2F10%2F04%2Fpersonal-jet-pack%2F&frame=true Pacific Wind homepage http://www.personalpropulsion.com/products.htm

A bicycle wheel, of radius 0.330 m and mass 2.00 kg (concentrated on the rim), is rotating at 4.12 rev/s. After 48.0 s the wheel comes to a stop because of friction. What is the magnitude of the average torque due to frictional forces? First I did I = (1/2)(mr^2) = (1/2)(2kg)(0.330^2 m) =...

A bicyclist coasts down a 7.0 degree hill at a steady speed of 5.0 m/s. Assuming a total mass of 75kg (bicycle plus rider), what must be the cyclist's power output to climb the same hill at the same speed? I get 90N * 5.0 m/s = 450W The book says 9.0 * 10^2 W It looks like I'm...

Information given: Two bicycle tires are set rolling with the same initial speed of 3.60 m/s along a long, straight road, and the distance each travels before its speed is reduced by half is measured. One tire is inflated to a pressure of 40 {\rm psi} and goes a distance of 18.1 m; the other...

So my question is actually really simple.I want to know approximately how much energy does a normal dynamo produce when a bicycle wheel is spinning (at let's say 10 km/h).Please answer me with a number not with a formula because I'm really bad at physics but i just want to test a theory of mine...

Hi, Lets say that we have a 2 wheel bicycle riding at 2m/s. The weight distribution on this bicycle implies that the front wheel is exerting a total of 400N on the ground, whilst the back is exerting 560N. How would I work out whether at this speed if I were to lock up the front brake...

I remember years ago seeing a bicycle that was very light and collapsible. You could even carry it. It was tremendously expensive, though. Do they still make such a thing? It would be very helpful in getting around campus. I need to be able to fit it into my car so I could transport it from...

I noticed that if two bicycles roll down a hill, then the one with bigger wheels will get to the bottom first (I tested this with my brother). I could only think of one explanation: The bigger wheels make less revolutions and thus have less friction. Is that the reason? Are there other ones...

Any good sites/other resources that I could look at?

Suppose you ride a bicycle on a horizontal surface in a circle with a radius of 20 m. The resultant force exerted by the road on the bicycle (normal force plus frictional force) makes an angle of 15 degs with the vertical. a. What is your speed? b. If the frictional force is half its maximum...

my teacher Never went over this in class. ever. please help, thanks Two bicycle tires are set rolling with the same initial speed of 3.70 m/s along a long, straight road, and the distance each travels before its speed is reduced by half is measured. One tire is inflated to a pressure of 40 psi...

Hi, I have a question: How does people keep balance when they riding a bicycle or skating? Moving seems to be essential, when riding a bicycle, we can argue that the wheel is rotating, so it's angular momentum keeps the balance. But in the case of skate, nothing is rotating, but people seem to...

"Pennytech" Bicycle rack for a motorcycle i quess this can be the second part of a "Theme" of posting to present my little works of passion... first I'm sure many of you are going to think and express this is to dangerours,, well i have about 150,000 milles of riding using it without any...

This question has been bothering me for time. How does a moving bicycle manage to stay upright? but when it slows down it tends to fall to a side. Can someone please explain?

Why are Bicycle wheels the same size? Is it because it is easier to manufacture and maintain or does having same wheel sizes in the front and back offer added stability when compared to having a bigger wheel at the back (like the early models)?

The figure shows a bicycle wheel resting against a small step whose height is h = 0.110 m. The weight and radius of the wheel are W = 29.0 N and r = 0.350 m. A horizontal force F is applied to the axle of the wheel. As the magnitude of F increases, there comes a time when the wheel just begins...

The figure shows a bicycle wheel resting against a small step whose height is h = 0.110 m. The weight and radius of the wheel are W = 29.0 N and r = 0.350 m. A horizontal force F is applied to the axle of the wheel. As the magnitude of F increases, there comes a time when the wheel just begins...

Hi guys, my teacher gave every person in my class a problem to think about over the weekend...it should be pretty easy but let's just say that physics isn't my subject hahaha. well i was hoping you guys could help me out with this, the problem says: "You are teaching your little brother to...

I am thinking if buying one for next summer, but my memories of having on when i was a kid are not good, cycling any distance left me with a sore bum, i have looked at some of the modern bicycles and they seem a bit bare, no mud guards and very little chain guards, the ones i looked had...

I have a bicycle frame. I want to analyze this frame as a spring mass system. What details i should know. I should know the frame's stiffness. ok let us say it as x. Then the centre of gravity of the frame. Let us say it is also known. But now the frame can be pulled or pushed and then...

If we are to remove mass from a bicycle, does it have a better effect to remove this mass from the tires instead of the frame due to rotation and such? One opinion states that this is eminence only during acceleration and not during constant velocity?

Please go thro the link. it shows an animation of bicycle shox. http://www.santacruzmtb.com/vpp/. click on the animation Suppose a person of weight 100kg sits on this how can i know the velociy,accelerations at various points on the bicycle. Can any basic dynamics theory help in this?

i have a small hand pump, that i can set on a block of wood and put all of my weight against to get some pretty high pressures. i dont' have a good gauge so I'm not really sure what i can do with it, other than get tires pretty high pressure (if i had to guess, at the least 75psi). i...

I just put slick tires on My Bicycle, my beloved Fuji. It used to have nubby tires. Now the ride is so smooth... They say that there is not a significant decrease in traction on smooth tires, because the rubber-coated nylon tires actually take on the shape of the pavement pebbles as they...

A bicycle has wheels with a diameter of 0.620 m. It accelerates uniformly and the rate of rotation of its wheels increases from 183 rpm to 275 rpm in a time of 20.7 s. Find the linear acceration of the bicycle.

Hi again. So, my teacher has requested that we do an explanation of how this chain works and to some how improve the method. http://home.comcast.net/~p.jectz/bike.jpg There's the basic idea with the force acting downwards and the teeth of the chain pulling. So we could find torque to...

I'm helping Andre Liederhosen train for the Tour de France. Andre wants to get some exact measurements of the distance he rides during training. He knows I'm a surveyor, so asked if I'd help. I said sure. I took a piece of reflective tape and stuck it to Andre's spine just below the neck. Then...

Here is a common engineering problem. How do you engineer a bike lock that cannot be easily picked? High-quality video footage circulating on the internet http://www.engadget.com/entry/7796925370303347/ at least some cylindrical locks can be picked in about one second with the hollow plastic...

I'd like to put a valve (like the ones on tire tubes) that will connect to a bicycle pump onto a PVC tube (on the side, or at the end). Anyone know how I can do this? What fittings will I need? Thanks.