Turntable Definition and 103 Threads

Homework Statement Suppose a record turntable rotates at constant angular velocity. a) Does a point on the rim have radial and/or tangential acceleration? b) If the turntable's angular velocity increases uniformly, does the point have radial and/or tangential acceleration? c) For which...

Homework Statement You are standing on the edge of a turntable with frictionless bearings. It is initially rotating when you catch a ball, which is moving in the same direction but faster than you are moving and on a line tangent to the edge of the turntable. Assume you do not move relative...

Hello, I'm trying to design and fabricate a dc motorized turntable (24" diameter fairly light-weight pressed wood table top) to rotate at various slow speeds between 1 revolution per hour to perhaps as fast as one revolution per minute carrying a load of up to 10 pounds on a lazy susan type...

Homework Statement A beetle with a mass of 30.0 g is initially at rest on the outer edge of a horizontal turntable that is also initially at rest. The turntable, which is free to rotate with no friction about an axis through its center, has a mass of 80.0 g and can be treated as a uniform...

Homework Statement An LP turntable must spin at 3.52 rad/s to play a record. How much torque must the motor deliver if the turntable is to reach its final angular speed in 1.7 revolutions, starting from rest? The turntable is a uniform disk of diameter 30.8 cm and mass 0.26 kg. Homework...

A 2.0 {\rm kg}, 20-cm-diameter turntable rotates at 100 {\rm rpm} on frictionless bearings. Two 500 {\rm g} blocks fall from above, hit the turntable simultaneously at opposite ends of a diagonal, and stick. What is the turntable's angular velocity, in rpm, just after this event? I'm not...

Homework Statement A turntable that is initially at rest is set in motion with constant angular acceleration a. What is the angular velocity of the turntable after it has made one complete revolution? Homework Equations 2(pi)rads=1 revolution the 3 constant acceleration equations, i...

Homework Statement A block of mass 3.5kg rests on a rough horizontal turntable at a distance of 1.2m from the axis of rotation. If the block begins to slide when the turntable is rotating at 20.0 rev/min, what is the coefficient of static friction between the block and the turntable...

I need an external turntable that I can control automatically by a routine which I will write in either Visual Basic 6, C or Visual C++. So I need a suitable interface to do this It will sit on my balcony overlooking the sea and will have a couple of dome cameras mounted on it which will...

Homework Statement A 2.05 kg, 33.64 cm diameter turntable rotates at 365 rpm on frictionless bearings. Two 280 g blocks fall from above, hit the turntable simultaneously at opposite ends of a diagonal, and stick. What is the turntable's angular velocity, in rpm, just after this event...

Homework Statement A coin is placed on a turntable that is rotating at 45.0 rpm. If the coefficient of static friction between the coin and the turntable is 0.186, how far from the center of the turntable can the coin be placed without having it slip off? Homework Equations mv^2/r <=...

Two identical blocks are tied together with a string and placed along the same radius of a turntable that is spinning about its center. The inner block is 4 cm from the center and the outer block is 5 cm from the center. The coefficient of static friction between the turntable and the blocks is...

Homework Statement Two identical blocks are tied together with a string and placed along the same radius of a turntable that is spinning about its center. The inner block is 4 cm from the center and the outer block is 5 cm from the center. The coefficient of static friction between the...

Homework Statement A man (mass m1 = 100 kg) stands at the fringe of the large rotary table (radius R = 5 m, massm2 = 100 x m1), which rotates at a frequency of 10/min. The man goes along a radius line towards the table center until he reaches the rotation axis. The spatial extent of the man...

I have built a turntable and “cart” to test the claim of being able to travel directly downwind faster than the wind using only the immediate force of the wind. Here is a video of the test. The turntable is level but looks like it’s on an angle because of the camera angle. The cart ran against...

Two identical blocks are tied together with a string and placed along the same radius of a turntable that is spinning about its center. The inner block is 4 cm from the center and the outer block is 5 cm from the center. The coefficient of static friction between the turntable and the blocks is...

Homework Statement Two identical blocks are tied together with a string and placed along the same radius of a turntable that is spinning about its center. The inner block is 3 cm from the center and the outer block is 5 cm from the center. The coefficient of static friction between the...

Homework Statement A point on a rotating turntable 20.0 cm from the center accelerates from rest to a final speed of .700m/s in 1.75s. At t=1.25s, find the magnitude and direction of (a) the radial acceleration, (b) the tangential acceleration, and (c) the total acceleration at that point...

Homework Statement A person stands at rest on a 5.0kg, 50cm diameter frictionless turntable. He receives spinning bicycle wheel, 180rpm counterclock wise, diameter 64cm, and the rim weighs 4.0kg. The wheel was held in a horzontal plane, the handles extend outward from the center...

Turntable ?? Homework Statement A block of mass M is place a Distance R from the center of a turntable rotating at W radians/sec. A. If the turntable is a frictionless surface, explain the motion of the block. B. If the turntable has coefficient of static Friction Us and the block is ready...

Hi, I got this question wrong on a test and am really quite lost about it. I'd appreciate somebody running me through it. --- "Suppose a 55 kg person stands at the edge of a 6.5 m diameter merry go round turntable that is mounted on a frictionless bearing and has a moment of inertia of...

Problem: What is the linear acceleration of a point on the rim of a 36 cm diameter turntable which is turning at 33 rev/min? My Work: T = \frac{2 \pi r}{v}; v = \frac{2 \pi r}{T} a_{r} = \frac{v^{2}}{r} \frac{33 rev}{min} \times \frac{1 min}{60 sec} = \frac{.55 rev}{sec} \frac{2...

Homework Statement An electric turntable 0.740m in diameter is rotating about a fixed axis with an initial angular velocity of 0.290rad/s . The angular acceleration is 0.900rad/s^2 . a) Compute the angular velocity after a time of 0.194s. - .465rev/s b) Through how many revolutions...

[SOLVED] Conservation of Angular Momentum Homework Statement A 60-kg woman stands at the rim of a horizontal turntable having a moment of inertia of 500 kgm^{}2 and a radius of 2.00 m. The turntable is initially at rest and is free to rotate about a frictionless, vertical axle through its...

[SOLVED] (101)Horizontal/Vertical forces on an object by a turntable I am taking PHY 101, which I am having a little trouble with. I took a physics course in high school which I really enjoyed; a lot of what I am doing is familiar, but the specifics confuse me occasionally. I know I have solved...

Homework Statement Consider a turntable to be a circular disk of moment of inertia I_t rotating at a constant angular velocity w_i around an axis through the center and perpendicular to the plane of the disk (the disk's "primary axis of symmetry"). The axis of the disk is vertical and the...

A 5.0 g coin is placed 22 cm from the center of a turntable. The coin has static and kinetic coefficients of friction with the turntable surface of µs = 0.80 and µk = 0.50. What is the maximum rpm that the turntable could speed up to without the coin sliding off? m = .005 kg r = .22 m...

A 5.0 g coin is placed 22 cm from the center of a turntable. The coin has static and kinetic coefficients of friction with the turntable surface of µs = 0.80 and µk = 0.50. What is the maximum rpm that the turntable could speed up to without the coin sliding off? m = .005 kg r = .22 m µs = 0.8...

Homework Statement A turntable reaches an angular speed of 45.0 rpm, in 2.1 s, starting from rest. (a) Assuming the angular acceleration is constant, what is its magnitude? _2.24_rad/s2 (b) How many revolutions does the turntable make during this time interval? ______ rev...

Homework Statement A small metal cylinder rests on a circular turntable that is rotating at a constant rate. Let R be the distance between the cylinder and the center of the turntable. Now assume that the cylinder is moved to a new location R/2 from the center of the turntable. Which of the...

Homework Statement The coefficient of friction between a certain brass block and a large revolving turntable is µ = 0.18. How far from the axis of rotation can the block be placed before it slides off the turntable if it is rotating at 33 1/3 rev/min? Homework Equations how can i do...

Homework Statement Shown from the top view are six blocks that are sitting at rest on rotating turntables. All of the turntables have the same rotation rate (i.e. same frequency). The masses of the blocks and how far out from the center they sit varies. The specific values are given in the...

This is from an example in a book: On a horizontal turntable that is rotating at constant angular speed, a bug is crawling outward on a radial line such that its distance from the center increases quadratically r=bt^2, \theta=\omegat where b, \omega are constants. The example then solves for...

I have some lp's I'd like to digitize. Anyone have any opinions on USB turntables such as these?: http://www.buy.com/retail/searchresults.asp?querytype=home&qu=usb+turntable&qxt=home&display=col&dclksa=1

Homework Statement A turntable rotates at 78 rev/min A particle on the turntable is located 0.14 m from the center of the rotating turntable The particle on the turntable has a mass of 16 g. Calculate the force of friction which keeps it from sliding off Homework Equations f_s =...

Homework Statement A 200g, 40-cm-diameter turntable rotates on frictionless bearings at 60 rpm. A 20g block sits at the center of the turntable. A compressed spring shoots the block radially outward along a frictionless groove in the surface of the turntable. What is the turntable's rotation...

If there's a cat and a turntable both of same mass each... and the cat starts walking around the edge of the turntable which is initially at rest, how would the angular velocity of the two objects compare? Would the cat move at all since it has the same mass as the turntable and momentum has to...

An LP turntable must spin at 3.51 rad/s to play a record. How much torque must the motor deliver if the turntable is to reach its final angular speed in 1.8 revolutions, starting from rest? The turntable is a uniform disk of diameter 31 cm and mass 0.26 kg. I know that 1.8rev is equal to 648...

This seems pretty basic but I am drawing a blank. Thanks in advance. "A cat is sitting on the rim of a wooden turntable that is free to turn about a vertical axis. The turntable's mass is 3 times the cat's mass and is initially at rest. The cat then starts walking around the rim at a speed of...

Information given: A small metal cylinder rests on a circular turntable that is rotating at a constant speed as illustrated in the diagram View Figure . The small metal cylinder has a mass of 0.20 \rm kg, the coefficient of static friction between the cylinder and the turntable is 0.080...

Angular momentum... A uniform disk has a mass of 3.7 kg and a radius of 3.8 m. The disk is mounted on frictionless bearings and is used as a turntable. The turntable is initially rotating at 20 rpm. A thing walled hollow cylinder has the same mass and radius as the disk. It is released from...

Hi: New to this forum and have a quick question. Hope I'm posting in the right area. First of all, I'm not an engineer, nor do I pretend to be one but I'm having to settle an argument between two people who think they are. There is a ten foot diameter turntable constructed of a 2" steel...

I have tried this problem many times, but I can't even get it started really. Any hints are appreciated! A 60.0 kg woman stands at the rim of a horizontal turntable having a moment of inertia of 500kg/m^2 and a radius of 2 meters. The turntable is initially at rest and is free to rotate about...

The coefficient of friction between a certain brass block and a large revolving turntable is µ = 0.09. How far from the axis of rotation can the block be placed before it slides off the turntable if the turntable rotates at a constant rate of 33 1/3 rev/min (so that it requires time T = 60/33.33...

Two identical blocks are tied together with a string and placed along the same radius of a turntable that is spinning about its center. The inner block is 4 cm from the center and the outer block is 5 cm from the center. The coefficient of static friction between the turntable and the blocks is...

and does not slide off. in this case does centripetal force = frictional force? I think the answer is yes, but want to make sure. thanks

Please help. Consider a turntable to be a circular disk of moment of inertia I_t rotating at a constant angular velocity omega_i around an axis through the center and perpendicular to the plane of the disk (the disk's "primary axis of symmetry"). The axis of the disk is vertical and the disk...

A coin is placed 10.0 cm from the axis of a rotating turntable of variable speed. When the speed of the turntable is slowly increased, the coin remains fixed on the turntable until a rate of 36 rpm is reached, at which point the coin slides off. What is the coefficient of static friction between...

[FONT=Times New Roman]I need help with this one problem: A small metal cylinder rests on near the edge of a circular turntable that is rotating at a constant speed. The small metal cylinder has a mass of 0.20 kg, the coefficient of static friction between the cylinder and the turntable is...

The coefficient of friction between a certain brass block and a large revolving turntable is µ = 0.26. How far from the axis of rotation can the block be placed before it slides off the turntable if it is rotating at 33 1/3 rev/min? :confused: :frown: :smile: