Angular velocity Definition and 841 Threads

angular velocity...(check it out n tell me what u guys think) hello ppl... consider this problem... u could refer 2 resnick n halliday 5th edition, the 3rd author is krane. chapter 10, problem no. 8. theres a disc that's rotating about a horizontal axis with angular velocity 'w'. a...

how can negative angular velocity (back spin) be calculated when the ball is struck by a lofted club?

find an expression for the balls angular velocity in terms of R,y,and g mr*omega^2=mg so i had omega=sqrt(g/R) and I am saying that the angular velocity does not depend on its height. am i right?

a disk is 8.0 cm in diameter. A reference dot on the edge of the disk is initially located at theta =45 . The disk accelerates steadily for 1/2 second, reaching 2000 rpm, then coasts at steady angular velocity for another 1/2 second. What is the speed of the reference dot at t=1 ok so you...

got a real tricky but fun problem, wheel A is going 35 rad/s, with I = 25 Kg*m2 and merges into wheel B with I = 15 Kg*m2, if they stick together at contact, find its angular velocity and change in Kinetic Energy... PlEASE HELP: So far, I have L = IW, or 8.8 x 10^2 kg m2/sec and L = IW...

A 5.4m diameter merry-go-round is rotating freely with an angular velocity of 0.730 rad/s. Its total moment of inertia is 1665kg*m2. Four people standing on the ground, each of mass 60.8kg, suddenly step onto the edge of the merry-go-round. What is the angular velocity of the merry-go-round now...

1) A 5.4m diameter merry-go-round is rotating freely with an angular velocity of 0.730 rad/s. Its total moment of inertia is 1665kg*m2. Four people standing on the ground, each of mass 60.8kg, suddenly step onto the edge of the merry-go-round. What is the angular velocity of the merry-go-round...

Under some circumstances, a star can collapse into an extremely dense object made mostly of neutrons and called a neutron star. The density of a neutron star is roughly 10^14 times as great as that of ordinary solid matter. Suppose we represent the star as a uniform, solid, rigid sphere...

At time t=0 a grinding wheel has an angular velocity of 29.0 rad/s. It has a constant angular acceleration of 34.0 rad/s^2 until a circuit breaker trips at time t = 2.30 s. From then on, the wheel turns through an angle of 434 rad as it coasts to a stop at constant angular deceleration. now...

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...

Hey I was doing a question and I need someone to check if my method is ok - or stop me if I'm on completely the wrong track! A block of mass m is attached (with a massless string) to a wheel. Consider the bicycle wheel is not turning initially. The block is allowed to fall a distance of...

The problem reads as follows: A runner of mass m=36 kg and running at 2.9 m/s runs and jumps on the rim of a playground merry-go-round which has a moment of inertia of 404 kgm^2 and a radius of 2 m. Assuming the merry-go-round is initially at rest, what is its final angular velocity to three...

Consider a bicycle wheel that initially is not rotating. A block of mass m is attached to the wheel and is allowed to fall a distance h. Assume that the wheel has a moment of inertia I about its rotation axis. Consider the case that the string tied to the block is attached to the outside of...

I was curious as to how to approach this problem... An old phonograph record is spinning at 77.6 rpm. The phonograph needle is stuck 7.4 cm from the spindle. a) What is the angular velocity of the record? b) What is the speed of the record below the needle? c) What is the period corresponding to...

An astronaut is being tested in a centrifuge. The centrifuge has a radius of 10.5 m and, in starting, rotates according to Θ(theta) = 0.13t^2, where t in seconds gives Θ in radians. When t = 5.0 s, what are the astronaut's angular velocity? What is the astronauts linear speed? What is...

I have figured out the first part regarding the equation, but I don't really know what to write for the second part. Intuitively I think the rod would swing down, because m1 is heavier, and it would have the greatest velocity when vertical. But I have no idea if I'm right, and if I am I can't...

I already posted this somewhere, but silly me, i can't find it. Q: A disk of radius 2.40 cm and mass 1 kg is pulled by a string wrapped around its circumference with a constant force of 0.36 Newtons. What is the angular velocity of the disk to three decimal places after it has been turned...

Q: A disk of radius 2.40 cm and mass 1 kg is pulled by a string wrapped around its circumference with a constant force of 0.36 Newtons. What is the angular velocity of the disk to three decimal places after it has been turned through 0.85 of a revolution? So I started by obtaining my degrees...

So I've been using: \alpha=\tau/I More specifically: \alpha=(r*F)/(.5mr^2) I know I'm getting the acceleration just fine. I've then been using: \omega^2 = 2\alpha\Delta\Theta I know the problem is coming in here. Probably in conversion of units (rad/s^2) to (rev/s^2) or something...

I saw this on Wikipedia \omega=\frac{2\pi}{T}=2\pi f = v/r What I don't understand is \omega= \\ \frac{2\pi}{T}=2\pi f How can they be equivilant? Thanks

we are just about to take a test in physis.. I am quite scared. i have revised on all the topics required but i don't get the use of omega in angular velocity equations. what is the equation and when do i need to use it? sarah

I am given, in each of three cases, an angular velocity \Omega(r) and am told to assume no axial (z) velocity i.e., u_z = 0. I am asked to (1) find the velocity field in cartesian coordinates (2) find the vorticity distribution in threee cases. (1) As setup, the problem asks me to...

Here's the problem as written: A disk with moment of inertia I1 rotates with angular velocity Wi about a frictionless vertical axle. A second disk, with moment of inertia I2 initially not rotating, drops onto the first disk. Since the surfaces are rough, the two eventually reach the same...

This is a hard problem! :cry: Anyone know what my mistakes are?? ----- A passenger on the ferris wheel normally weighs 367 N. The ferris wheel has a 14 m radius and is equipped with a powerful motor. The operator revs it up so that the customers at the top of the wheel feel zero g's (they...

The axle of a wheel is mounted on supports that rest on a rotating turntable as shown in Fig. 10-50. The wheel has angular velocity w1 = 50.0 rad/s about its axle, and the turntable has angular velocity of w=35.0 rad/s about a vertical axis. (Note arrows showing these motions in the figure.)...

does anyone know how to convert 33 revolutions/minute to velocity (meter/sec) when the radius is 1.47 meters?

Ok, did I do this correctly? The question goes: Determine the angular velocity and angular acceleration of the disk and the link AB at the instant A rotates through 90 degrees. See attachment for the figure. What I did--first the disk: Assuming \alpha_{disk} is constant...

I have a book that gives a formulae Angular Speed as same as the Angular Velocity...is that true? From what i understand, speed is a scalar quantity...so it only have the magnitude value while velocity is a vector quantity which also shows the direction. Also, will the average angular...

Hey i have this problem and would like to know if what i got is somewhere in the right direction. Any help would be GREATLY appreciated A gymnast is performing a forward double somersault. The gymnast’s initial angular velocity is 0 rad/s. The gymnast generates a 115 N-m torque. The...

Hello, I need to confirm my solution to this problem: A thin rod of length l stands vertically on a table. The rod begins to fall, but its lower end does not slide. (a) Determine the angular velocity of the rod as a function of the angle \phi it makes with the tabletop. (b) What is the speed...

A small mass m is attached to a point O by an inextensible string of length a. The mass is held with the string taut, at the same level as O, and released. Determine the angular velocity of the mass when the string makes an angle \thetawith the downwards vertical. From this relationship...

consider a body rotating with a constant angular velocity 'w' along the z axis of the space reference frame.the centre of mass of the body is at the origin of the space system of coordinates. now since 'w' is a vector, it must transorm according to the rotation matrix R (in this case as...

I can't find formula for determing the number of rotations a wheel makes in one minute. Diameter = 26" Traveling at 20 feet per second. is there a formula for RPM? Also need the formula to determine angular velocity. thanks

A Ferris wheel has a radius of 8 meters and rotates once every 15 seconds. A 10:1 scale model of the Ferris wheel also rotates once every 15 seconds. Which has the higher Angular Velocity? Solution: angular velocity = Change in rotation/change in time Do I use the formula v = rw...

here is the problem: An airplane propeller is 2.08 m in length (from tip to tip) and has a mass of 117 kg. When the airplane's engine is first started, it applies a constant torque of 1950 N*m to the propeller, which starts from rest. -What is the angular acceleration of the propeller...

if a disk which is initially spinning with an angular velocity,w, radians per second is pushed with an initial linear velocity of v, what is the resultant motion? assume a kinetic friction of mu normal to the disk i would love to see how this problem is solved. it seems real...

If a top is spinning in the horizontal x,y planes in a counter-clockwise motion, the vector of its angular velocity and acceleration is perpendicular to that plane, specifically in the positive z direction. Is there any specific reason for direction? My book states that the vector must be...

Can somebody tell me what is the angular velocity of an electron (more or less) around the nucleus. (it doesn't matter whether it's one in the most inner shell or the most outter, I just need an average value) thanks

An alternator attached to a water turbine generates 35 Watts given 50 feet of head and 10 gallons per minute. Assuming that the efficiency of the alternator is 50%, is it possible for me to find the angular velocity from this information? If so, how would I do it?

Can anyone tell me the difference between "rotational velocity" and "angular velocity"? I got that angular velocity is the dimension of angle/time, but rotational velocity is the dimension of rotations/time. Will appreciate it if you can also provide me with some references defining the...

Hi all, recently joined and having abit of trouble with a problem (several actually but I managed to figure out how to get started on one of them). In any case the problem says: Four thin, uniform rods each of mass M and length d = .75 m, are rigidly connected to a vertical axle to form a...