Disk Definition and 783 Threads

Hello to all...first post here! I need to compute 3D (x,y,z) points around the surface of a pipe. By pipe I mean something like an underground pipeline. Let's say I'm given the bottom point of the pipe in x,y,z coordinates, the diameter of the pipe (say 12 feet), and the inclination or...

when I was running a standard check on my HDD I found when I ran my disk filler (to completely delete my files PM me if you don't understand) i found 2Gb would not write i checked the binary point only to find it was empty.. absolutely nothing (just before anyone says my OS is on a separate part...

Help me….my hard disk is damaged! Hi everyone , I am employed as a manager in a firm. I have a problem that I had like to talk about. My system was working fine the other day, but while copying a file by nero….the system hanged and I had to restart it. But I got a disk boot failure error. Then...

Hello! I need to know whether the hard disk is on or off during the following states (in windows vista): -During Standby -During Hybrid Standby -During Hibernation Note that I mean by on that the hard disk is spinning regardless if it is reading,writing or doing nothing. Please I need...

I'm confused when to use the shell method vs. the disk method Specifically in this problem: If the region encolsed by the y-axis, the line y=2 and the curve y=\sqrt{x} is revolved around the y-axis, the volume of the solid generated is: However when I use the shell method and the disk...

[SOLVED] Force needed to make a disk climb a step Howdy ho. First off, let me say that I'm a newbie here, and I'm not sure if this is the correct place to put this doubt. Here's the deal: Homework Statement We have a disk, and we need to know the force F needed to have it climb the step...

I have attempted to solve this question and I got stuck at the last part. Here you go. A uniform solid disk is set into rotation with an angular speed X about an axis through its center. While still rotating at this speed, the disk is placed into contact with a horizontal surface and...

Homework Statement A curcial part of a piece of machinery starts as a flat uniform cylindrical disk of radius R0 and mass M. It then has a circular hole of radius R1 drilled into it. The hole's center is a distance h from the center of the disk. Find the moment of inertia of this disk (with...

Homework Statement http://urlcut.com/katrolafbeelding.gif What is the accelaration of a point on the circumference of the disk? Homework Equations \tau = F.R = I.\alpha I = M.R²/2 a = R.\alpha F(z) = m.g The Attempt at a Solution The mass exerts a force F(z) = m.g on...

hi, everyone. Do anyone here can suggest where, which book or website can learn more bout the theory behind the magnetic hard disk, and it current technology? i.e. spintronic...

For some time I've been thinking of making a round disk shaped model aircraft that would appear to have low drag, maximum internal carrying space, and maximum load carrying ability. As you can guess, there is little available on such a design, other than the Pancake, built at the end of WWII...

Homework Statement A uniform disk of radius 0.12 m is mounted on a frictionless, horizontal axis. A light cord wrapped around the disk supports a 1 kg object, as shown in the figure from rest the object falls with a downward acceleration of 2.3 m/s^2.The acceleration of gravity is 9.8 m/s^2...

Problem: A disk rotates about its central axis starting from rest and accelerates with constant angular acceleration. At one time it is rotating at 12 rev/s; 69 revolutions later, its angular speed is 33 rev/s. Calculate (a) the angular acceleration, (b) the time required to complete the 69...

Homework Statement A disk of radius 21.0cm is free to turn about an axle perpendicular to it through its center. It has very thin but strong string wrapped around its rim, and the string is attached to a ball that is pulled tangentially away from the rim of the disk (the figure ). The pull...

Homework Statement A disk with a radial line painted on it is mounted on an axle perpendicular to it and running through its center. It is initially at rest, with the line at theta 0 = -90°. The disk then undergoes constant angular acceleration. After accelerating for 3.1 s, the reference...

Does anyone know of any programs/methods for this? I had a disk crap out on me over the weekend and there are some email I didn't have backed up that I would like to try and recover. I tried repairing it with chkdsk and the Windows Recovery Console to no avail. Thanks...CS

Is there a general solution for gravity force in Alderson Disk system? Given: Alderson Disk system, disk inner radius R1, outer radius R2, thickness T, density Rho, star mass M (irrelevant due to superposition?). http://orbides.1gb.ru/orbf/ad1.jpg How to find amount and direction of...

Homework Statement During normal operation, a computer's hard disk spins at 5400 rpm. If it takes the hard disk 8.4 s to reach this angular velocity starting from rest, what is the average angular acceleration of the hard disk in rad/s2? Homework Equations ? The Attempt at a...

Homework Statement During normal operation, a computer's hard disk spins at 7200 rpm. If it takes the hard disk 3.7 s to reach this angular velocity starting from rest, what is the average angular acceleration of the hard disk in rad/s2? Homework Equations Wav = \varthetaf -...

I wasn't certain if this topic strictly belonged in the GR forum. I have read the article 'Singular disk of matter in the Cooperstock-Tieu galaxy model', by Mikolaj Korzynski (http://arxiv.org/abs/astro-ph/0508377). In it, the author finds that the singularity within Cooperstock & Tieu's...

Homework Statement A disk with a radial line painted on it is mounted on an axle perpendicular to it and running through its center. It is initially at rest, with the line at q0 = -90.0°. The disk then undergoes constant angular acceleration. After accelerating for 3.15 s, the reference line...

Consider the solid S described below. The base of S is a circular disk with radius 3r. Parallel cross-sections perpendicular to the base are squares. Find the volume V of this solid. I tried this... A(x) = pi*r^2 = pi*(3r)^2 = pi*9r^2 V(x) = integral from 0 to 3r(pi*9r^2 dx) =...

[SOLVED] Angular momentum and oscillation of disk A large solid disk of mass M and radius R is mounted on a fixed axis through its center using ideal bearings. A small projectile of mass m_1 traveling with velocity v_1 collides tangentially to the slight extension and sticks to the larger disk...

[SOLVED] Angular acceleration of disk For the system below, determine the tension in each rope, the linear acceleration of each mass and the angular acceleration of the disk. \ g=10 m/s^2. Use \ I=4 kgm^2. So far I have drawn the free-body diagram for m1 and m2 \ 120 - T_1 = 12a_1 and \...

A 5.0 kg, 60-cm-diameter disk rotates on an axle passing through one edge. The axle is parallel to the floor. The cylinder is held with the center of mass at the same height as the axle, then released. What is the cylinder's initial angular acceleration? ok so this is what i think i...

A 200 g, 20-cm-diameter plastic disk is spun on an axle through its center by an electric motor. What torque must the motor supply to take the disk from 0 to 1800 rpm in 4.0s? (Given: I = ½ MR2) Relevant equations I = 1/2 MR^2 T = Ia The attempt at a...

Homework Statement An 8.0-cm radius disk with a rotational inertia of 0.12 kg m2 is free to rotate on a horizontal axis. A string is fastened to the surface of the disk and a 10-kg mass hangs from the other end. The mass is raised by using a crank to apply a 9.0-N m torque to the disk. The...

Im having trouble installing a new HD into my computer. Where can I found information, accurate and up to date, about: partitioning, formating, fdisk, MBR, , multiboot, ... thanks.

A sanding disk with rotational inertia 1.22x10^-3 kgm^2 is attached to an electric drill whose motor delivers a torque of 15.8 Nm a) find angular momentum b) find angular speed of the disk 33.0ms after the motor is turned on. L = Iω τ = Iα we can find angular acceleration with what we...

Homework Statement Two shuffleboard disks of equal mass, one orange and the other yellow, are involved in an elastic, glancing collision. The yellow disk is initially at rest and is struck by the orange disk moving with a speed of 4.40 m/s. After the collision, the orange disk moves along a...

A uniform flat disk of mass M and radius R rotates about a horizontal axis through its center with angular speed ωi. a) What is its angular momentum b) A chip of mass m breaks off the edge of the disk at an instant such that the chip rises vertically above the point at which it broke off. How...

you need to design an industrial turntable that is 48.0 cm in diameter and has a kinetic energy of 0.300 J when turning at 31.0 rpm i found that inertia of the turntable about the rotation axis is = 5.71×10^-2 kg m^2 If your workshop makes this turntable in the shape of a uniform solid...

A computer disk drive is turned on starting from rest and has constant angular acceleration. If it took 0.410 s for the drive to make its second complete revolution, how long did it take to make the first complete revolution? What is its angular acceleration, in rad/s^2 I cannot find out...

A uniform disk of radius R and mass M is spinning with angular speed ωi. It is placed on a flat horizontal surface; the coefficient of kinetic friction between the disk and surface is μk. a) Find the frictional force on the disk. b) How long will it take for the disk to come to rest. I'm...

Homework Statement NOTE: Use g=9.809 m/s^2 A solid disk of radius R and mass 2.74 kg is spinning at angular velocity 61.1 rpm about a vertical axis. A solid disk of radius 2R drops concentrically on the first (sort of like dropping an old-fashioned 33 rpm record on a 45 rpm one), so that...

Homework Statement A disk rotates about its central axis starting from rest and accelerates with constant angular acceleration. At one time it is rotating at 7.0 rev/s; 83 revolutions later, its angular speed is 18 rev/s. Calculate (a) the angular acceleration (rev/s^2), (b) the time required...

Homework Statement Compute the volume of the solid formed in the first quadrant by y=x^4 and y=125x when rotated around the x axis. Homework Equations the integral for a disk is solved by taking the integral from a to b of pi R^2 The Attempt at a Solution I found the...

Problem 13.30 A thin, 60.0g disk with a diameter of 7.00 cm rotates about an axis through its center with 0.240 J of kinetic energy. What is the speed of a point on the rim? Homework Equations m=.06kg r=.035m KE=.240J The Attempt at a Solution K=(1/2)*I*(w^2) I=(1/2)*M*R^2 I'm using the...

I seem to have down 1-4 on this question but I am struggling on the rest... any help?? A circular disk of fixed radius r is used in a humidifier. It is partially submerged in water and rotates on its center. The goal is to determine the height above the water, h, at which to fix the center...

[SOLVED] Net torque of uniform disk Homework Statement A uniform disk with a mass of 34.8 kg and a radius of 0.32 m is free to rotate about a frictionless axle. Forces of 90.0 N and 125 N are applied to the disk, as the drawing indicates. What is the net torque produced by the two forces...

Homework Statement A disk of radius R has an initial mass M. Then a hole of radius (1/4)R is drilled, with its edge at the disk center (The center of mass of the cutout is in the x positive direction). Find the new rotational inertia about the central axis. Hint: Find the rotational...

Homework Statement What is the angular momentum of the 1.2kg, 3.6cm diameter rotating disk in the figure below? http://i241.photobucket.com/albums/ff4/alg5045/ex13-47.gif Homework Equations The Attempt at a Solution I tried using L = Iw. w = 600 rev/min x (1 min/60s) x 2*pi...

Homework Statement A disk and a box of equal mass are released from the top of two inclines both of which are a height h above the ground and make an angle θ to the horizontal. Let the radius of the disk be R. How much sooner does the box reach the bottom of the incline than the disk...

Homework Statement The 1.6kg, 20cm diameter disk in the figure below is spinning at 240rpm. How much friction force must the brake apply to the rim to bring the disk to a halt in 3.5s? http://i241.photobucket.com/albums/ff4/alg5045/p13-69.gif Homework Equations The Attempt at a...

The question is: Two horizontal forces F1 and F2 act on a 1.8 kg disk that slides over frictionless ice, on which an xy coordinate system is laid out. Force F1 is in the negative direction of the x-axis and has a magnitude of 3.0 N. Force F2 has a magnitude of 9.0 N. The figure below gives...

Homework Statement A ball with mass m and velocity v goes on a path tangent to a disk with radius R and a mass of M. There is a completely inelastic collision at the outer rim of the disk, and the entire system begins to spin around the axis. What was the final angular speed of the system...

Hi :). I'll just start describing the problem... An ant with mass m is moving anti-clockwise on a Disk with a perpendicular rotation axis (with no friction). The disk's radius is R and it's moment of inertia - I. The velocity of the ant *in relation to the Earth* is V while the disk is...

Hi, on the net I found some equation, and would like to know if they are correct ones. http://www.upei.ca/~physics/p261/projects/flywheel1/flywheel1.htm http://hyperphysics.phy-astr.gsu.edu/hbase/rke.html Physics: Stored energy = sum of kinetic energy of individual mass...

As we know the moment of Inertia of a disc in the center of mass equals 0.5mr^2 My Simple question is: what is the moment of inertia of the disc at any other point? as I know there is a formula that supports the distance from the center of mass, and is there a relation for 3D shapes...

I read the entry about the Ehrenfest rotating disk paradox on Wikipedia, but the entry does not actually answer my question about what happens to the circumference of the disk in the "resolution of the paradox" section. All I want to know is what happens to the circumference of the rotating...