Angular velocity Definition and 841 Threads

Homework Statement Close call! A fast car barely misses a man by 3 meters, while traveling at 30 meters per second. The man's head is tracking the car. What's his head's angular speed when the car is 3 meters away? Homework Equations Angular velocity = change in angle / change in time The...

[b]1. A top is a toy that is made to spin on its pointed end by pulling on the string wrapped around the body of the top. The string has a length of 64cm and is wound around the top at a spot where its radius is 2.0 cm. The thickness of the string is negligible. The top is initially at rest...

What is the angular velocity of the sun? thanks

1. For an object in circular motion, which of the following is/are directed perpendicular to the plane of the circle? Angular Acceleration, Tengintial Velocity, Angular Velocity, Tangential Acceleration, or Angular Displacement? 2. You are on Earth. Assume that one month is about 30 days...

A wheel is rotating about an axis that is in the z-direction. The angular velocity w_z is -6.00 rad/s at t=0, increases linearly with time, and is +8.00 rad/s at t =7.00s. We have taken counterclockwise rotation to be positive. a.) Is the angular acceleration during this time interval...

A 300m tower is built on the equator. How much faster does a point at the top of the tower move than a point at the bottom? The Earth is 6400km thus c=2pi * 6400000m and c of the top of the tower is c= 2pi *6400300m Now what? Thanks. Stephen

How many revolutions does the object make during the first 4 s well the area under the graph of the angular velocity versus time graph is 60 but I do not know how that helps. Any help would be appreciated. Stephen

Hi there! I'm doing a particular question which is the angular velocity and I got stuck there halfway through. Homework Statement Find the angular velocity omega *see attachment Va = 1.4m/s to the left Homework Equations Vb/a = l * omegaAB Vb = Va + Vb/a The Attempt at a...

Homework Statement Consider an electric dipole located in a region with an electric field of magnitude \vec{E} pointing in the positive y direction. The positive and negative ends of the dipole have charges +q and -q, respectively, and the two charges are a distance D apart. The dipole has...

Homework Statement A cameraman standing at A is following the movement of a race car traveling at a speed of 30 m/s. Determine the angular rate (theta dot) at which the man must turn to keep the camera directed on the car at theta = 30 degrees...

Homework Statement so i need to find the angular velocity of a solid sphere rolling down an inclined plane. I know the mass, radius, and distance the sphere travels. Homework Equations The Attempt at a Solution I know how to get angular velocity, but i need the translational...

A uniform rod has length 87 m and mass 8 kg. A mass of 8 kg is attached at one end. The other end of the rod is pivoted about the horizontal axis. a) determine the torque immediately after the rod-plus-mass system is released from the horizontal position. b) After the rod-plus-mass system...

hi i am a beginner at physics. my teacher just gave me this problem for a make up work but he did not give me any equations on solving this problem due to some misunderstanding he got mad at me. so here i am stuck... please help! A discus thrower (arm length 1.2 m) starts from rest and...

[SOLVED] Angular Velocity 1. The angular acceleration is given \alpha=-2w^2 rad/s^2 where \omega is the angular velocity in rad/s. When \theta=30 deg the angular velocity is 10 rad/s. What is the angular velocity when \theta=60deg? [b]2. Used \alpha=d\varpi/d\theta * \varpi...

[SOLVED] Problem finding angular velocity... ! Homework Statement The 9.65 lb uniform disk is pin supported at its center and is acted upon by a constant force of P = 1.45 lb as shown. The system starts from rest. Radius of disk is .470 ft The force P is going straight down from the...

Homework Statement Imagine that you swing about your head a .250 kg ball attached to the end of a string. The ball moves at a constant speed in a horizontal circle with a radius of 1.50 m. If it takes 1.20 seconds for the ball the make one revolution, (a)what is the ball's tangential speed...

[SOLVED] Angular velocity - different ans by conserv E and momentum Homework Statement This is Advanced Physics by Adams and Allday, spread 3.31, question 3. A pirouetting skater halves his moment of inertia by pulling in his arms and legs closer to his axis of rotation. a) By what factor...

angular velocity?! Homework Statement Hello, I am a 1st yr biomechanics student and I am having a lot of problems figuring this stuff out and I have an exam coming up and I'm kinda panicing! lol! ok here is the exact problem: "A 60kg diver is positioned so that his radius of gyration is...

Homework Statement Two thin rectangular sheets (0.26 m 0.35 m) are identical. In the first sheet the axis of rotation lies along the 0.26 m side, and in the second it lies along the 0.35 m side. The same torque is applied to each sheet. The first sheet, starting from rest, reaches its final...

For the rotational motion, on my book, it says "Since w (angular velocity) is the same for all points of a rotating object, a (alpha) also will be the same for all points.w and a are properties of the rotating object as a whole." The thing that I don't get is that why velocity is the same at...

Homework Statement What are the units of angular velocity of precession? I've looked evrywhere and can't find out. Homework Equations The Attempt at a Solution In my answer to a question, by putting units into the equation i think I am getting units as rad^-1 s^-1 but not sure...

Both angular frequency in Simple Harmonic Motion and angular velocity in Rotational Motion are given the same symbol, "omega" (w). I was wondering if these two values are equivalent. For instance, if there was a cylinder attached to spring and rolling down a ramp, would the angular frequency of...

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...

1. How do various distances influence the angular velocity of earth? Tangential velocity? explain Homework Equations 3. For some reason, I tend to think that distance doesn't relate, but I do not know where to begin to explain. I also could not find the answer in my physics book.

James move sin a circular path (radius 15.0m) with a speed of 60 m/s. His angular acceleration in rpm is? DO you ahve to convert to rad/s then to rev/s then rev/m? Any help would be appreciated

Homework Statement Which one of the following statements is NOT true for a rotating CD undergoing angular acceleration? A) The angular speed is the same at any point on the disk B) The lnear speed is the same at any point on the disk C) The angular accerlation is perpendicular to the...

Can someone please explain the difference in Angular Velocity for a Horizontal and a Vertical circle? :confused:

SOLVED: Angular velocity of an electron 1. The Bohr model of the hydrogen atom pictures the electron as a tiny particle moving in a circular orbit about a stationary proton. In the n = 2 orbit the distance from the proton to the electron is 21.16*10^-11 m, and the linear speed of the electron...

Homework Statement The angular velocity of the spinning Earth is approximately... 0.26 rad/hr 6.28 rad/hr 0.13 rad/hr or none of the above I am new at this forum as of today! I hope that somebody could show me how I should even begin this! I have no idea! Homework Equations 1 rev/s=...

Angular Velocity Question? In March 2004, a British company successfully tested a power system to tap the energy of ocean tides. The energy will be stored in an underwater turbine consisting of two metal blades, each 15.0 m long. The movement of the water due to the tides will give kinetic...

Homework Statement Jim rides his skateboard down a ramp that is in the shape of a quarter circle with a radius of 6.50 m. At the bottom of the ramp, Jim is moving at 2.82 m/s. Jim and his skateboard have a mass of 67.0 kg. How much work is done by friction as the skateboard goes down the...

Hi there, It is common that angular velocity = radius * rate of change of degree over time, But I read this somewhere, it reads angular vel = normal vector * rate of change of normal vector over time, Can anyone please explain the correlation? Thank you.

Help me...PLEASEE.. I would like to know about: 1)Background/History:Kinematics of a rigid bodies - linear and angular velocity 2)Application Kinematics of a rigid bodies - linear and angular velocity in dynamics Please reply me A.S.A.P =(

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...

Two problems involving angular velocity: Edit: Problem one solved! Hooray! 2.The Milky Way galaxy rotates about its center with a period of about 192 million years. The Sun is 2x10^20 m from the center of the galaxy. How fast is the Sun moving with respect to the center of the galaxy...

man i don't understand this stuff i have a test on thursday and i found some practice problems can anyone help me solve these( please show work) i need to learn how to do them i have the formulas i think but idont know when and which to use please help soon 1. In 1993, Bill tossed a ball...

[b]1. [b]1. The rear wheels of a tractor are 4 ft in diameter and turn at 20 rpm. a. How fast is the tractor going (ft. per sec.)? b. The front wheels have a diameter of only 1.8 ft. What is the linear velocity of a point on their tire treads? c. What is the angular velocity of the front...

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...

Homework Statement a gear of radius 0.4m and a gear of radius 1.2m are connected by a belt. if the smaller gear is rotating with an angular velocity of 10 rad/s, find the angular velocity of the larger gear. here is the formula: v = rw a. what can be said about the linear velocity of a...

Homework Statement A person is riding a bicycle, and its wheels have an angular velocity of +19.5 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 +11.5 revolutions. (a) How much time does it take for...

Homework Statement A coin is placed on a record turntable at a distance of 10cm from the turntable axis. The coefficient of static friction between the coin and the turntable is 0.21. If the turntable starts from rest with a constant angular acceleration of 1.2 rad/s2, how much time passes...

Homework Statement Suppose we have a horizental massless tube. One end of the tube is welded to seomthing that rotates on an angular velocity of w1=(0, 1, 0), on the other end of the tube there is a disk, which rotates with an angular velocity of w2=(0, 0, 2) The system's angular velocity is...

Homework Statement Description of a rigid body having an angular velocity w(t) = (cos(t), sin(t), sqrt(3)) How does a movement of a rigid body having this angular velocity looks like? For instance, what would be the course of a point p=(0, 0, 1) on this body? Homework Equations r the...

Unfortunately I was absent when a similar example was done in class... Homework Statement [FONT="Courier New"]A 10 g bullet traveling at 400 m/s strikes a 10 kg, 1.0-m-wide door at the edge opposite the hinge. The bullet embeds itself in the door, causing the door to swing open...

Cylinder about side, finding angular velocity... Homework Statement 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...

Homework Statement Find the angular velocity and period of oscillation of a solid disc of mass m and radius R about a point on it’s surface. Homework Equations ? The Attempt at a Solution This is really giving me trouble because it seems like a SHO problem mixed with a rotational motion...

Homework Statement what is the difference between angular velocity and angular frequency? Homework Equations The Attempt at a Solution

i think i have part a right (but who knows). i don't know about part b. any help is appreciated! Homework Statement 1) a car is traveling at 80km/h, and is towing a trailer. the wheels of the trailer are 40cm in diameter. a) determine the angular velocity in rad/s and degrees/s radius...

Homework Statement A flywheel has shape as a homogeneous cylinder with mass m = 40,0 kg and radius r = 0,50 meters. The cylinder is rotating round the axis of symmetry, and is runned by a motor with constant angular velocity (w0). When the motor is switched off, the cylinder is affected by a...

Homework Statement A ride in an amusement park consists of a cylindrical chamber that rotates around a vertical axis as shown in the diagram below. When the angular velocity is sufficiently high, a person leaning against the wall can take his or her feet off the floor and remain "stuck" to the...