Angular velocity Definition and 866 Threads

Alright, I am doing an experiment that involves rolling a marble down a curved railing in order to find its kinetic energy, both in terms of translation and rotation. My teacher recommended I set up two photogates in order to find the time taken for the ball to travel in between two points on...

Sir, In a double star system, 2 stars of masses m and M separated by a distance d rotate about their common centre of mass. What is their common angular velocity?

A merry-go-round is accelerated from rest by a child at a steady acceleration of 0.2 rad.s-2. 1)How long does it take for the merry go round to reach an angular velocity of 1.4 rad.s-1? 2)How many revolutions does the merry go round (and the child) make in this time? I believe I worked...

Does anyone know where I can find a list of angular velocities of different kinds of bullets fired from different kinds of guns?

A gymnast is performing a floor routine. In a tumbling run she spins through the air, increasing her angular velocity from 3.00 to 4.65 rev/s while rotating through one-half of a revolution. How much time does this maneuver take? ok I understand that I am going to be using one of the...

Can someone please help me with this problem: You are swinging a mass at the ned of a string contained in a vertical plane. The length of the string is r. The mass moves just enough to complete hte circle. The motion is a constant total energy and we take the sense of rotation as positive...

but let say there are thre rods which are joining together to become a stick but not straight.stick A,stick B and stick C.if the angular velocity of stick C is given,how can i find the angular velocity of stick A?? pls help...

does anybody knows how to find the angular velocity of the midpoint of a bar?? pls help...

does anyone knows that there are two rods A and B joining together at a point,if angular velocity of rod A is given,how can i fing the angular velocity of the other rod?? or any recommended website or materials related to angular velocity of rods and gear?? pls help...thanx

I have a problem involving a hand crank, an axle, and a bucket. The crank turns the axle. The axle lowers the bucket. When someone spins a hand crank, the angular velocity of the hand crank and the axle are the same right? I think it and they seem to be the same. The velocity of the...

This problem is from Tipler's Physics for Scientists and Engineers, Chapter 9, Problem 15. The tape in a standard VHS videotape cassette has a length L = 246 m; the tape plays for 2.0 h (Figure 9-36). As the tape starts, the full reel has an outer radius of about R = 45 mm, and an inner radius...

If I have a thin wheel of radius R attached to an axle of length R. The wheel rotates around an axis at the other end of the axle, parallel to the diameter of the wheel. that is, i rotate the wheel around one end of the axle so that the wheel goes around the end of the axle with frequency w...

A disc of moment of inertia 23.4 kg m2 is made to rotate about an axis through its centre by a torque of T . The disc starts from rest, and after {t} s has kinetic energy 632.2 J. Calculate the angular velocity (in rad s-1) after {b} s. if i work out the angular velocity from the KE=0.5*I*w^2...

how do you express angular velocity in spherical coordinates? like the Earth rotates with constant speed, so the direction of the angular velocity vector is out the north pole. if it was spherical coordinates , how do you specify that direction? i know that z = r cos theta so \hat{k} = r...

Angular velocity HELP! On a certain game show, contestants spin a wheel when it is their turn. One contestant gives the wheel an initial angular speed of 3.70 rad/s. It then rotates through one-and-one-quarter revolutions and comes to rest on the BANKRUPT space. Through what angle has the wheel...

a cockroach of mass m lies on the rim of a uniform disk of mass 10m that can rotate freely about its center like a merry go round. Initially the cockroach and disk rotate together with an angular velocity of \omega_0. Then the cockroach walks halfway to the center of the disk. What is the...

Hey, here's the question: You are an athlete on the high bar in a fully extended position 180 degrees from the right horizontal. My weight: 667.08N Center of mass:80.5cm Radius of gyration: 122 cm 1)Calculate the torque at the beginning of the bar and for every 30 degrees until the...

Here is the homework question... According to the Guinness Book of World Records, the highest rotary speed ever attained was 2010m/s(4500mph). The rotating rod was 15cm(6in.) long. Assume the speed quoted is that of the end of the rod. What is the centripetal acceleration of the end of the...

A uniform cube is positioned in unstable equilibrium on one of its edges. It's given a small nudge. Show the angular velocity when one face hits the ground is \frac{12g}{5l}(\sqrt{2}-1), when the block slips without friction, where l is the length of its side. It seems to me the best...

I got the following qn: In a circus performance, a large 5kg hoop of radius 3m rolls without slipping. If the hoop is given an angular speed of 3 rad/s while rolling on the horizontal and allowed to roll up a ramp inclined at 20 degrees with the horizontal, how far(measured along the incline)...

The angular position of a point on the rim of a rotating wheel is given by theta = 4* t - 3* t^2 + t^3, where theta is in radians if t is given in seconds. find the angular velocities as t = 1 and t = 5.5 i plugged the numbers into the given equation to get 2 and 97.625 then i divided by...

I'm having problems with parts b and c... At time t= 0 a grinding wheel has an angular velocity of 22.0 rad/s . It has a constant angular acceleration of 26.0 rad/s^2 until a circuit breaker trips at time t= 2.30 s . From then on, the wheel turns through an angle of 436 rad as it coasts...

angular velocity help! Hi, I need help with the following 2 questions. My answers have ********* next to them. Any help is appreciated. Thank you. 1. A disk is rotating at a constant rate about a vertical axis through its center. Point Q is twice as far from the center of the disk as...

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...