Wheel Definition and 840 Threads

Homework Statement Imagine a woman standing on a rotating disc (D) with a rotating wheel in her stretched arms (se picture here: http://image.vandrermodlyset.net/rotation.jpg ). The wheel is oriented in a horizontal plane, with the rotating axis (W) of the wheel parallel to that of the...

I have a mechanics question. "A wheel starts from rest and rotates with constant angular acceleration about a fixed axis. 1) Prove that the power at any given time is proportional to the square of the net torque about the axis. 2) Prove that the power at any given angular displacement...

Homework Statement A student of weight 678 N rides a steadily rotating Ferris wheel (the student sits upright). At the highest point, the magnitude of the normal force N on the student from the seat is 565 N. (a) What is the magnitude of N at the lowest point? If the wheel's speed is...

Homework Statement a wheel of mass M has a radius R It is standing vertically on the floor and we want to exert a horizontal force F at its axle so that it will climb a step against which it rests. The step has a height h where h<R what is the minimum force F needed? Homework Equations...

Homework Statement A woman rides a carnival Ferris wheel at radius 21 m, completing 4.2 turns about its horizontal axis every minute. What are (a) the period of the motion, and the magnitude of her centripetal acceleration at (b) the highest point and (c) the lowest point? Homework...

Homework Statement The Ferris wheel in the figure View Figure , which rotates counterclockwise, is just starting up. At a given instant, a passenger on the rim of the wheel and passing through the lowest point of his circular motion is moving at 3.00 m/s and is gaining speed at a rate of...

Greetings all! There is a bit of a debate in the world of mountain bikes, concerning the conventional 26" wheel diameter versus the rising popularity of the 29" wheel size (nominal diameters). One of the popular beliefs is that the 29" wheel requires a larger brake rotor than a 26" wheel...

I'm attempting to write a simple model to describe the angular velocity profile (aka angular acceleration) of a bicycle wheel for different torque vs time profiles. Where this gets complex is that it's not a normal bicycle wheel. It is a normal wheel with weights on the spokes connected to...

Homework Statement You are riding a Ferris wheel 120 feet in diameter. It makes one complete revolution every minute. How fast are you falling when you are halfway to the bottom? Homework Equations None The Attempt at a Solution I really am not sure where to start. I'm actually not even...

I have noticed an apparent correlation between two seemingly unconnected phenomena, but I do not have the mathematical ability to prove the connection. I was wondering what a rolling wheel would look like at relativistic speeds. To investigate this I created a java simulation that solves the...

Homework Statement A grinding wheel 0.35 m in diameter rotates at 2500rmp. What is the linear acceleration of a point on the edge of the grinding wheel? For the linear acceleration, should it be atotal=atan+aR? Should we find both tangential acceleration and centripetal acceleration? But on...

Homework Statement Could someone explain this problem a little better to me. Problem: Calculate the net torque about the axle of the wheel shown in Fig. 8-39. Assume that a friction torque of 0.45 m·N opposes the motion and that F = 18. *see attachment for picture. I'm confused...

Homework Statement A string is wound tightly around a wheel. When the end of the string is pulled through a distance of ? cm, the wheel rotates through ? revolutions. What is the radius of the wheel? Homework Equations The Attempt at a Solution i'm confused about this...

Homework Statement A person is riding a bicycle, and its wheels have an angular velocity of +20.0 rad/s. Then, the brakes are applied and the bike is brought to a uniform stop. During braking, the angular displacement of each wheel is +10.0 revolutions. (a) How much time does it...

Homework Statement The apparent weight a person feels is the normal force that acts on the person. Suppose a Ferris Wheel has a diameter of 28.om and makes one revolution every 13.3 seconds. What is the ratio of a person's apparent weight to real weight a) at the top and b) at the bottom...

hey guys, i was wondering if anyone could explain how to find the linear acceleration of a point at the top and bottom of a wheel. the homework problem is as follows (just so you know the context, i don't want the answers, i want to know how to go about this.): Consider a 61 cm diameter tire on...

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 small rubber wheel is used to drive a large pottery wheel. The two wheels are mounted so that their circular edges touch. The small wheel has a radius of 2.0 cm and accelerates at the rate of 7.2 rad/s^2, and it is in contact with the pottery wheel (radius 21.0 cm) without slipping...

I am building a robot for a design class. Part of the design includes a wheel base to drive the robot forward. To accomplish this I was going to attach a spur gear system to a wheel axel and drive the input gear with an electric motor. The gears themselves will be made out of acrylic and cut...

A wheel has eight spokes and a radius of 37.5 cm. It is mounted on a fixed axle and is spinning at 3.75 rev/s. You want to shoot a 17.0 cm long arrow through the wheel, parallel to this axle, without hitting any of the spokes. Assume that the arrow and the spokes are very thin and evenly spaced...

Homework Statement A force of 21.09 N is applied tangentially to a wheel of radius 0.340 m and gives rise to an angular acceleration of 1.20 rad/s ^2. Calculate the rotational inertia of the wheel. a) 7.46 kg . m2 b) 4.98 kg . m2 c) 8.96 kg . m2 d) 5.97 kg . m2 Homework Equations...

Homework Statement A bicycle has wheels of radius 0.29 m. Each wheel has a rotational inertia of 0.091 kg·m^2 about its axle. The total mass of the bicycle including the wheels and the rider is 79 kg. When coasting at constant speed, what fraction of the total kinetic energy of the bicycle...

Not original #'s but same questions: Homework Statement A 750N child rides a ferris wheel that is moving at a constant velocity. At the highest point the child has an apparent weight of 650N. (a) what is the acceleration of the wheel? (b) what is the apparent weight of the child at the...

Homework Statement A bicycle has wheels of radius 0.3 m. Each wheel has a rotational inertia of 0.08 kg* m2 about its axle. The total mass of the bicycle including the wheels and the rider is 74 kg. When coasting at constant speed, what fraction of the total kinetic energy of the bicycle...

Plz I need ur urgent Help : Wheel speed what is the wheel speed in an axial compressor ? for example when we say that the axial velocity remains constant and equal to the wheel speed of U = 50 m/s? Does this refer to the rotational speed , or just a value for the axial velocity ...

Homework Statement Water falls onto a water wheell from a height of 2.0m at a rate of 95kg/s (a) If this water wheel is set up to provide electricity output, what is the max power output. (b) What is the speed as it hits the wheel? Homework Equations Ep= mgh Ek= 1/2mv^2 The...

Homework Statement A stiff uniform wire of mass M_0 and length L_0 is cut, bent, and the parts soldered together so that it forms a circular wheel having four identical spokes coming out from the center. None of the wire is wasted, and you can neglect the mass of the solder.

well, not exactly. I'm working on a little project for school (art school, ironically) and I think I'm a bit in over my rudimentary physics education. Basically, my idea is to create a wide, hollow wheel with a motor hidden inside of it, so that to the casual observer the wheel appears to...

A Ferris wheel that rotates three times each minute and has a diameter of 16.0 m What force [magnitude and direction (measured inward from the vertical)] does the seat exert on a 43.0 kg rider when the rider is halfway between top and bottom, going up? Ok, the magnitude is easy... Fnet...

Homework Statement A passenger on the ferris wheel described in problem 18 (Problem 18: Fairgoers ride a Ferris wheel with a radius of 5.00m The wheel completes one revolution every 32.0s) drops his keys when he is on he way up and at the 10 o'clock position. Where do the keys land relative...

If a hamster runs in a wheel, how do I figure out the rotational velocity that the wheel achieves (after it stops accelerating)? Is it to do with the mass of the hamster or the speed at which it runs? I'm familiar with the basic concepts of rotational motion (moment of inertia, torque etc) but...

Hi there... As English is not my native language I want to apologise up front for any mistakes. I have tried asking my question in a local Dutch forum, but I have not received a satisfactory answer yet. So, I thought I will try internationally. Imagine a fast spinning wheel, like in a...

Here is a little animation of an idea I have, It's a wheel that spins continuously and is powered by magnets. Here's the link : http://www.youtube.com/watch?v=uNBVQBVOJMw" The description of the video will explain my idea. Please tell if this would work in real life.

Hi, I have to find the torque required to run a wheelchair and then to match it with the electrical parameters to find motor/motor sizing, is it ok 1) if i assume some acceleration that gives me force and then finding T= F*r (N-m) where r is the radius of the wheelchair. 2) then finding...

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...

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 A 30cm diameter wheel rolls without slipping at 120rpm. The point of contact with the ground has an instantaneous speed of: a-5.2mm/s b-1.04cm/s c-2.6 m/s d-zero Homework Equations I'm not really sure about my final answer but i think is d-zero because i have a...

Let a bicycle run straight on a plane past you from left to right with constant speed. As a representative point of the bicycle take the center of the back axle. Since the bicycle has constant speed with regard to the plane, so has the axle (trivial). In addition a point on the rim of the wheel...

this is my game based on my wheel theory, the question is how many non-repetitive combinations of letters that link (eg. ab, bc, cd, and ag, gy, ly ect.) can be found in this game, i don't know it myself and i figure this is the best place to post the question since it's a bit involved. bonus...

I am trying to remember the rumor I heard about a new gun shooting design in one of my ap physics class discussions, do you guys now of any new breakthrough designs? anyway i think it has to do with the reloading mechanism. (I know I have asked a question of this type before, so if i sound...

Hello, Say you have a frictionless setting. In this setting are two skateboards. One has a waterwheel (or any wheel with fins) propped up on beams so that it is on the skateboard and can freely turn. On the other skateboard is a person standing on it. If the skateboards are one behind the...

Homework Statement A potter's wheel of radius 0.50 m and mass 100.0 kg is freely rotating at 50.0 rev/min. The potter can stop the wheel in 6.0 seconds by pressing a wet rag against the rim. a. What is the angular acceleration of the wheel? b. How much torque does the potter apply to the...

A wagon wheel is constructed as shown in the figure. The radius of the wheel is 0.300 m, and the rim has mass 1.36kg . Each of the eight spokes, that lie along a diameter and are 0.300 m long, has mass 0.270kg . What is the moment of inertia? Wouldn't it just be the sum of the masses...

Homework Statement A wheel of radius 1.0 m is rotating with a constant angular speed of 2.0 rad/s. What is the centripetal acceleration of a point on the wheel’s rim? A) 1.0 m/s2 B) 4.0 m/s2 C) 0.50 m/s2 D) 2.0 m/s2 Homework Equations Would it be v^2/r? The Attempt at a...

Roulette "Chasing" -- betting on the imperfection of the wheel... I've come up with a simple idea called "chasing". First off let's look at the fact that a roulette wheel is NOT PERFECTLY random. Small dents, unequal traction, etc. These imperfections may only give a .01% improvement on...

Help! Plane motions rolling wheel Hi there, I am not having any luck with this question at all and am hoping that there is someone out there that can help me out... here goes: The below cyclinder rolls to the right at 10 in/sec. Determine the angular velocity of BC and CD I am actually...

Homework Statement A wheel accelerates from rest to 59 rad/s at a rate of 29 rad/s². How many revolutions the wheel turned while accelerating?Homework EquationsThe Attempt at a Solution I'm confused, I suck at this kind of problem. I got change in angular velocity which would be 59rad/s, and...

Need some help with a problem here: A hot splinter is dislodged from a spinning grinding wheel. Which of the paths drawn in figure best represent its subsequent motion, given that the axis of rotation is a) vertical b) horizontal ? Heres is the picture for the q...

I am having a bit of trouble with the following problem. A cyclist starts from rest and pedals so that the wheels make 8.5 revolutions in the first 4.6 s. What is the angular acceleration of the wheels (assumed constant)? I multiplied 8.5 by 2pi and then divided by 4.6 sec. I get an answer...

I am having a bit of trouble with the following problem. What should I do to start? A cyclist starts from rest and pedals so that the wheels make 8.5 revolutions in the first 4.6 s. What is the angular acceleration of the wheels (assumed constant)?