Flywheel Definition and 255 Threads

Hello everyone, First of all may i say i am a layman to physics. Unfortunately, i have difficulty with maths. However, my question is this... Supposing i wish to rotate a car wheel (by hand) with the brake engaged upon it; but am not quite strong enough to turn it. Supposing i were...

Problem: An experimental flywheel, used to store energy and replace an automobile engine, is a solid disk of mass 200.0 kg and radius 0.40 m. (a) What is it's rotational inertia? (my calculation says 16 kg.m) (b) When driving at 22.4 m/s (50 mph), the fully energized flywheel is rotating at...

Homework Statement The flywheel of a gasoline engine is required to give up 500 J of kinetic energy while its angular velocity decreases from 650 rev/min to 520 rev/min. What moment of inertia is required? Homework Equations K = (1/2) * I * w^2 K = kinetic energy I = moment of...

Homework Statement A flywheel is a solid disk that rotates about an axis that is perpendicular to the disk at its center. Rotating flywheels provide a means of storing energy in the form of rotational kinetic energy and are being considered as a possible alternative to batteries in electric...

What is the magnitude of the tangential component of the linear acceleration of a particle that is located at a distance of 50 cm from the axis of rotation when the flywheel is turning at 78.0 rev/min? I took 78 rev/min and converted it to rad/s and got 4.08 rad/s. I then multiplied that by...

Q # 1. the film crew CANDID CAMERA replaces person's briefcase with an identical one that contains a mounted and spinning flywheel. explain what happens when the person tries to carry the briefcase around the corner?

Homework Statement The angular momentum of a flywheel having a rotational inertia of 0.140 kg m^{2} about its central axis decreases from 3.00 to 0.800 kg m^{2}/s in 1.50 s. a) What is the magnitude of the average torque acting on the flywheel about its central axis during this period? b)...

Hi, i would be grateful if anyone could help me find out the angular acceleration and angular velocity of a flywheel? The flywheel is made from solid steel 500mm diamter x 78mm thick and is supported by two free running bearings (frictionless). The flywheel is rigidly attached to a 30mm...

[SOLVED] moment of inertia Homework Statement The flywheel of a gasoline engine is required to give up 750 J of kinetic energy while its angular velocity decreases from 870 rev/min to 410 rev/min. What moment of inertia is required? Homework Equations I=\frac{2K}{\omega^{2}} The...

Hi all, whilst bored recently I thought wouldn't it be a great idea to have bicycles where the pedals accelerate a massive flywheel and then you release some kind of clutch mechanism to propel the bike forwards. As i thought about it the main problem was what to use for such a flywheel (I was...

Hello... new to forum... I am looking into design of a forced air turbine that will drive a generator and flywheel. The flywheel would be utilized for short periods of zero air supply and as an energy resevoir to maintain revs at an optimum level. Dimensions: Turbine/AC generator/flywheel...

I need a bit of help with a few questions. In a hybrid vehicle a flywheel is used to capture the energy of the car during braking. If the car has a total mass of 850kg and the flywheel has a mass-moment of inertia equal to 14kgm2 determine the speed of the flywheel when the car stops for...

Homework Statement In a hybrid vehicle a flywheel is used to capture the energy of the car during braking. If the car has a total mass of 850kg and the flywheel has a mass-moment of inertia equal to 14kgm2 determine the speed of the flywheel when the car stops for traffic lights in an urban...

The flywheel of a steam engine runs with a constant angular speed of a 149 rev/min. When the steam is cut off, the friction of the bearings and of the air brings the wheel to rest in 1.9 hours. a) assuming it is constant, what is the angular acceleration of the wheel? b) how many rotations...

The angular momentum of a flywheel having a rotational inertia of 0.200 kg·m2 about its axis decreases from 3.00 to 1.800 kg·m2/s in 1.80 s. (a) What is the average torque acting on the flywheel about its central axis during this period? N·m (b) Assuming a uniform angular acceleration...

Hey. Just wondering if I could get a little help with this quest please. A flywheel has a moment of inertia of 854kgm^s, and is allowed to come to rest from and angular velocity of 450rpm. Knowing that kinetic friction produces a resisting moment of magnitude 14Nm, determine the time required...

Ok so I just had a bit of a eureka moment. Conventional battery flywheels are not made to be portable (gyroscopic forces make this quite difficult). This can be offset with gimbaled systems, negating the gyroscopic effects that occur in a fast-moving flywheel. However, these types of systems are...

Homework Statement Delivery trucks that operate by making use of energy stored in a rotating flywheel have been used in Europe. The trucks are charged by using an electric motor to get the flywheel up to its top speed of 960 rad/s. One such flywheel is a solid homogenous cylinder, rotating...

Is it difficult to make? as a complete beginner, what do I need to know, and am I way in over my head? :) any help would be appreciated.

Hi! I've been reading this forum for a few days now and I'm impressed by how the questions are answered.Short,simple and easy to understand. So I thought I could get a good answer to my question here. One day,I was talking with someone who studied mechanical engineering.I told him that my...

Homework Statement A high speed flywheel in a motor is spinning at 450 rpm when a power failure suddenly occurs. The flywheel has mass 35.0 kg and diameter 74.0 cm. The power is off for 33.0 seconds and during this time the flywheel slows due to friction in its axle bearings. During the time...

I am trying to understand how to calculate the torque on a flywheel. If I have a 90 pound flywheel that is 20" in diameter, how do I find the torque? Thanks for your help. :smile:

Our air motor has 2 cylinders and is a low rpm device. It therefore needs a flywheel to store enough torque to get the crankshaft past the dead spots at 10 degrees before and after top dead center and 10 degrees before and after bottom dead center. My question is how to calculate the...

Homework Statement The flywheel of a steam engine runs with a constant angular speed of 156rev/min. When the steam is shut off, the friction of the bearings and of the air brings the wheel to rest in 2.20h. What is the tangential linear acceleration of a particle 52.4cm from the axis of...

Physic help urgent A high-speed flywheel in a motor is spinning at 500 when a power failure suddenly occurs. The flywheel has mass 36.0 and diameter 75.0 . The power is off for 34.0 and during this time the flywheel slows due to friction in its axle bearings. During the time the power is...

Am having some trouble with a project at the moment and wondered if anyone could help. Essentailly the project was to design an energy storage system to propel a small buggy. We opted for a flywheel, the buggy wheels and hence the flywheel are to be accelerated on a rolling road and then the...

Hi, I'm not an engineer. Unfortunately, my irrepressible brother has somehow coaxed and cajoled me into tinkering with alternative energy - à la vegetable oils, ethanols, etc - and now I'm hooked. I'd love to have one of those Lister Cold Start twin cylinder stationary diesels to play with...

Homework Statement The flywheel of a steam engine runs with a constant angular speed of 137 rev/min. When steam is shut off, the friction of the bearings and the air brings the wheel to rest in 2.7 h. What is the magnitude of the tangential component of the linear acceleration of a...

This may be a question better suited for the mech/aero engineering section, but I figure I'll start here. MY question relates to a phenomenon that I just can't seem to figure out. It has to do with a flywheel in a car. With a lighter flywheel i would expect to see more horsepower...

Homework Statement A flywheel is a homogeneous cylinder of mass M with a hole in the middle where the axle connects with it. The outer radius of the wheel is R. The radius of the axle is r, and the mass of the axle is m. A weight of mass m_w is suspended from a string wound around the axle...

Help explain to me the understandings behind running an iron flywheel compared to an aluminum flywheel (or vice versa) in a street car and or drag car. An iron flywheel (21lbs for example) will help a car get off the line better from a launch compared to a lighter flywheel (11lbs for example)...

A flywheel of mass 42.7 kg is supported by an axle 1.65 m long, with two small wheels. The axle's wheels roll on an elevated track, part of which has a curve of radius, R = 15.9 m. If the flywheel has angular momentum 75.50 kg·m2/s, what is the maximum speed at which the system can take the...

help -- what's a flywheel? This is a somewhat nasty homework problem from Kleppner and Kolenkow that I don't even know how to begin to set up (never spent much time with cars, I guess.) "When an automobile rounds a curve at high speed, the loading (weight distribution) on the wheels is...

A flywheel is a solid disk that rotates about an axis that is perpendicular to the disk and its center. Rotating flywheels provide a means for storing energy in the form of rotational kinetic energy and are being considered as a possible alternative to batteries in electric cars. The gasoline...

Hi. I'm having difficulty answering three questions of my homework and hope someone will lend a hand. The questions seem beyond what we've had in class but I need to do them regardless. Diving Board Problem Consider a diving board: o/ [- 1m -][- 3.4m -]|_ <-- person...

An electric motor turns a flywheel through a drive belt that joins a pulley on the motor and a pulley of the flywheel. The flywheel has a mass of 80 kg and a diameter of 1.25m. Its pulley has a much smaller mass and a radius of .230m. the tension in the upper (taut) part of the belt is 135N and...

OKie, I am having a bit of trouble with this problem... The flywheel of a steam engine runs with a constant angular velocity of 160 rev/min. When steam is shut off, the friction of the bearings and of the air stops the wheel in 1.2 h. (a) What is the constant angular acceleration, in...

Hey all, I realize that when weight is moved from the center of a flywheel toward the outer edge (or a larger diameter wheel is used), the capacity for energy storage increases. But I have no idea how to calculate how much that increase actually is, or whether the increase remains constant...

Flywheel Question?? Hi all I have done the following question: A flywheel , intially rotating at a speed of 600 rev/min, is brought to rest with uniform angular deceleration in 10 seconds. A) How many revolutions does the flywheel make before coming to rest? I used Pheta = (Wo + W)t/2...

Any ideas on how to approach / set up the following problem? http://img124.imageshack.us/img124/9707/untitled8vv.jpg

This is a poorly posed question but i do not know another way to ask so, a magnetic flywheel is rotating at X rpm, a weakly attracted much smaller body is attracted to the flywheel, at some point in the smaller bodier decent to the flywheel, can it be given some acceleration that will take it...

It's come upon my interest that besides capacitors, flywheels can also be used to store considerable amounts of energy at impressive levels. The best material is supposedly carbon fiber, since it can spin at high speeds. But what about other materials like steel fibers or fiberglass? Those...

Hi, A flywheel with a diameter of 1.2 m is rotating at an angular speed of 200 revs/min What is the angular speed of the flywheel in radians per second? Would I just do this? 200 revs/min = 3.33 revs/sec 3.33 revs/sec = 6.66(pi)rads - - - answer?

The flywheel of a steam engine begins to rotate from rest with a constant angular acceleration of 1.33 rad/s2. It accelerates for 23.5 s, then maintains a constant angular velocity. Calculate the total angle through which the wheel has turned 48.7 s after it begins rotating. \omega = \omega _...

hi all! Are composites like carbon fibres (CFRP) the best material for flywheel? There is no doubt on its high strength to density ratio. Regarding the safety consideration, is flywheel made of composites safer than that made of other materials? I've read through some articles claiming that...

hi all! Are composites like carbon fibres (CFRP) the best material for flywheel? There is no doubt on its high strength to density ratio. Regarding the safety consideration, is flywheel made of composites safer than that made of other materials? I've read through some articles claiming that...

Flywheels are interesting but dangerous if they malfunction because the energy is concentrated in the vicinity of the rotor. My question to you ME's is this- could you engineer a practical and/or efficient energy storage system that relied on gravity? I envision an enourmous mass on a...

What is energy?How a flywheel stores energy? What is the physics behind that?

Question: A flywheel 0.600 m in diameter pivots on a horizontal axis. A rope is wrapped around the outside of the flywheel, and a steady pull of 40.0 N is exerted on the rope. The flywheel starts from rest, and 5.00 m of rope are unwound in 2.00 s. Okay i have tried finding the angular...

"A flywheel 0.600 m in diameter pivots on a horizontal axis. A rope is wrapped around the outside of the flywheel, and a steady pull of 40.0 N is exerted on the rope. The flywheel starts from rest, and 5.00 m of rope are unwound in 2.00 s. 1. What is the angular acceleration of the flywheel?"...