Angular acceleration Definition and 551 Threads

Homework Statement A wheel is spinning at 800 rad/s. A torque is applied to the wheel until it stops spinning 14 seconds later. What is the angular acceleration, and how many revolutions did it go through? v=800 read/s t=14 s Homework Equations angular acceleration = delta w...

Homework Statement Hey guys. I got this poll which is at one side connected to a wall and is being released from a horizontal state. his length is L and mass m. I need to find the angular acceleration of the poll as a function of the angle. I got this answer in the pic but according to...

A potter's wheel is 101 kg and has radius of 0.483 meters and is freely rotating at 71.9 rev/min. the potter can stop the wheel in 6.54 s by pressing against the rim and exerting a radially inward force of 103 N. find coefficient of kinetic friction. I found alpha=71.9 x 2 x pi/60sec/ 6.54=...

Homework Statement There is a seesaw. The pivot point is closer to the left side than the right side. Let`s call the left length of the beam L1 and the mass on the left side m1. The right sideof the beam is L2 and the mass is m2. Information is L1 = 0.990 m, L2 = 1.78m, m1 = 4.40 kg, and m2...

Given is a 6' long 40 lb bar hung horizontally by a pin O at its end. It is released from its horizontal position and hits a stopper after reaching a 30 degree angle with the horizontal position at which it started. I am asked to find the value x for which the angular velocity is a maximum and...

Homework Statement A small current loop of area A = 1.5cm^2 carries current I = 3.6mA. What torque acts on it in a lab where its magnetic moment is perpendicualr to the Earth's magnetic field of 4.2 x 10^-5 (b) Find its angular acceleration if its rotational inertia about a diameter is...

Having a bit of trouble with this question right here. If anyone could give some guidance it would be appreciated. A hammer is being accelerated at 15 rad/s^2. Given a radius of rotation of 1.7mm what are the magnitudes of the radial and tangential components of acceleration when the...

1. a) A X kg toy car accelerates at constant rate from Vo m/s to Vf m/s in C revolutions while going around a circular track of radius R cm. Find: - α, the magnitude of the angular acceleration of the car. - t, the time it took to reach the final speed 2. To calculate the angular...

Homework Statement The Attempt at a Solution I thought I could take the second derivative and get the angular acceleration from which I could use where ω is the angular velocity, is the linear tangential acceleration, and r is the radius of curvature. But for some reason, it didn't...

Homework Statement A wheel accelerates with constant angular acceleration of 6 rad/22. If the initial angular velocity is 6 rad/s. what is the angle in degrees that the wheel rotates through in 2 seconds? Homework Equations 360 degrees = 2pi radians The Attempt at a Solution...

A bicycle has wheels of 0.8 m diameter. The bicyclist accelerates from rest with constant acceleration to 22 km/h in 13.7 s. What is the angular acceleration of the wheels? relevant equations: omega = omega initial + alpha * t 22km/h = 6.11m/s I did 6.11m/s * 13.7s = 83.7207 to get the...

Homework Statement A computer disk is turned on starting from rest and has constant anglular acceleration. If it took 0.570s for the drive to make its second complete revolution, how long did it take to make the first complete revolution? Also what is its angular acceleration Homework...

Homework Statement A meter stick is hinged at its lower end and allowed to fall from a vertical position. With what angular speed does it hit the table?Homework Equations V = rW (Not sure?) The Attempt at a Solution I have no clue where to even start with this problem, given the small amount...

Homework Statement Two pulley wheels, or respective radii R1 = 0.34 m and R2 = 0.64 m are mounted rigidly on a common axle and clamped together. The combined moment of inertia of the two wheels is I + 1.2 kg*m^2. Mass m1 = 25 kg is attached to a cord wrapped around the first wheel, and another...

Homework Statement In a Beams ultracentrifuge, a 20.3 cm long rotor is suspended magnetically in a vacuum. Since there is no mechanical connection to the rotor, the only friction is the air resistance due to the few air molecules in the vacuum. If the rotor is spinning with an angular speed of...

If I hang a pendulum on the ceiling of an accelerating train (with an initial angular displacement), how would the angular acceleration be affected? My intuition told me that the angular acceleration of the pendulum should be affected by the acceleration of the train. But...whether the...

Homework Statement A long, 1 kg uniform rod and 1.4 m length, is supported at the left end by a horizontal axis into the page and perpendicular to the rod. The right end is connected to the ceiling by a thin vertical thread so that the rod is horizontal. The thread is burned by a match...

A space station is constructed in the shape of a wheel 23 m in diameter, with essentially all of its 7.9×10^5 kg mass at the rim. Once the station is completed, it is set rotating at a rate that requires an object at the rim to have radial acceleration g, thereby simulating Earth's surface...

Homework Statement Find angular acceleration. Homework Equations \omega=\frac{2\pi}{t} \frac{\delta*\omega}{\delta*t}=a_{angular} The Attempt at a Solution \frac{\delta*\omega}{\delta*t}=-1*2\pi*t^{-1-1} -2\pi*t^{-2}=\frac{-2\pi}{t^2} \frac{-2\pi}{t^2}=a_{angular} Is this right?

Hey Just trying to work out this question (see image). Solving for I (see other image) in an effort to find the angular velocity. Could someone have a look at this working and tell what I am doing right and wrong? Thanks Heaps Ed

A circular saw blade completes 1200 revolutions in 40s while coasting to a stop after being turned off. Assuming constant deceleration, what are (a) the angular deceleration and (b) the initial angular speed? Answer in RPM/S Method I used: Change in theta is 1200 Time: 40s final Vel.:0...

A piece of machinery is spinning at 760rpm . When a brake is applied, its rotation rate drops to 480rpm while it turns through 210 revolutions. What is the magnitude of the angular deceleration? Answer in Rad/s^2 Eqn I used:\omega^2=\omega_0_^2+2\alpha(change in theta) I put...

Im a little fuzzy on the difference between the two. If you look at the attached picture, if that force stays with the object as it rotates, like a hand pushing in the same spot, would that force cause an angular acceleration?

As you press down on the accelerator of your car you see the tachometer climb steadily from 1200 rpm to 5500 rpm in 2.5 s. (a) What is the angular acceleration of the car? (b) What is the tangential acceleration of a point on the edge of the engine’s 3.8 cm diameter crankshaft...

[SOLVED] Two wheels and angular acceleration Homework Statement In the figure below, wheel A of radius rA = 11 cm is coupled by belt B to wheel C of radius rC = 25 cm. The angular speed of wheel A is increased from rest at a constant rate of 1.6 rad/s2. Find the time needed for wheel C to...

[SOLVED] Another angular acceleration problem. Converting radians to meters... Homework Statement A gyroscope flywheel of radius 3.13 cm is accelerated from rest at 15.0 rad/s2 until its angular speed is 2760 rev/min. (a) What is the tangential acceleration of a point on the rim of the...

[SOLVED] Rod...and angular acceleration Homework Statement A uniform rod AB, of length 2a and mass m, has a particle of mass 1 2m attached to B. The rod is smoothly hinged at A to a fixed point and can rotate without resistance in a vertical plane. It is released from rest with AB horizontal...

Weight and Wheel ! (Linear and Angular Acceleration) Homework Statement Consider a bicycle wheel that initially is not rotating. A block of mass is attached to the wheel and is allowed to fall a distance . Assume that the wheel has a moment of inertia, I, about its rotation axis...

Question: A flywheel has a constant angular acceleration of 2 rad/sec^2. During the 19 sec time period from t1 to t2 the wheel rotates through an angle of 15 radians. What was the magnitude of the angular velocity of the wheel at time t1? Hint: let t1=0 sec, and t2=t Equations: \vartheta...

Angular Acceleration and Velocity..please help :) hi could someone please explain to me conceptually what angular acceleration and angular velocity are. Also how would the angular acceleration and angular velocity of the people on a merry go round change with the location of the people...

Homework Statement 24. A person tries to balance vertically each of three long uniform cylinders with equal radii on the end of his finger: * A wood cylinder of mass m and length L with moment of inertia I * A bamboo cylinder of mass m and length 3L with moment of inertia 9I...

[SOLVED] Magnitude of the angular acceleration about the pivot point? Homework Statement A uniform horizontal rod of mass 2.7 kg and length 2.4 m is free to pivot about one end as shown. The moment of inertia of the rod about an axis perpendicular to the rod and through the center of mass...

Homework Statement A metal plate in the shape shown has a mass of 2.00kg and hangs from a pivot point located a distance d=0.300m from its center of mass. Its moment of inertia, I_cm, about an axis perpendicular to the plate and passing through the CM is 0.210kg*m2. Calculate the magnitude...

Homework Statement A car engine accerlates from 1080rpm to 4800rpm in 12.5 seconds. Calculate the angular accleration, assumed constant, and the total number of revolutions the engine makes in this time The Attempt at a Solution angular acceleration (a) = (wf - wi) /(tf - ti) (a)...

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...

[SOLVED] angular acceleration of a Propeller Homework Statement An airplane propeller is rotating at 2000rev/min . \omega[SIZE="1"]z = 209rad/s How long in seconds does it take for the propeller to turn through 40degrees? Homework Equations \theta = 1/2\omegat \omegaz =...

Homework Statement A car speeds up as it turns from traveling due south to heading due east. When exactly halfway around the curve, the car's acceleration is 2.70 m/s^2, 10.0 degrees north of east. What is the radial component of the acceleration at that point? Homework Equations I...

Homework Statement An Atwood's machine consists of two masses, m1 and m2, which are connected by a massless inelastic cord that passes over a pulley, Fig. 10-70. If the pulley has radius R and moment of inertia I about its axle, determine the acceleration of the masses m1 and m2 (a), and...

Hi, i would be grateful if anyone could help me find out the angular acceleration and angular velocity of a flywheel? The flywheel is made from solid steel 500mm diamter x 78mm thick and is supported by two free running bearings (frictionless). The flywheel is rigidly attached to a 30mm...

Homework Statement A tire 2.00 feet in diameter is placed on a balancing machine, where it is spun so that its tread is moving at a constant speed of 60.0 mi/h. A small stone is stuck in the tread of the tire. What is the acceleration of the stone as the tire is being balanced? Homework...

Here are three questions on my physics homework and my attempts to solve them...am I looking at this the right way? Question 1: A tire placed on a balancing machine in a service station starts from rest and turns through 4.7 revolutions in 1.2 seconds before reaching it's final angular speed...

Uniform Angular Acceleration please help :) A wheel is subjected to uniform angular acceleration. Initially its angular velocity is zero. During the first 1-s time interval, it rotates through an angle of 88.3 Through what angle does it rotate during the next 1-s time interval? - I found the...

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 A wheel is subjected to uniform angular acceleration. Initially its angular velocity is zero. During the first 1-s time interval, it rotates through an angle of 90.6degrees. (a) Through what angle does it rotate during the next 1-s time interval?(in degrees) (b)...

Angular Acceleration (please help) A cyclist starts from rest and pedals so that the wheels make 7.5 revolutions in the first 4.8 seconds. What is the angular acceleration of the wheels (assumed constant)?

I have coached and taught baseball collegiately and professionally for the past 15 years and have stumbled upon a question that is beyond my math education. How does linear movement of a rotating system effect the angular acceleration of that system if the system is moving left to right and...

[SOLVED] angular acceleration, displacement Homework Statement A flea is at point A on a horizontal turntable 9.3 cm from the center. Place the coordinate origin at the center of the turntable withthe positive x-axis fixed in space and initially passing through A. THe turntable is rotating at...

Homework Statement Imagine a car driving on the XY plane in the +y-direction. If it is slowing down, in what direction is the angular acceleration of the wheels? (a) the +x-direction (b) the -x-direction (c) the +y-direction (d) the -y-direction (e) the +z-direction Homework Equations...

1. The tub of a washer goes into its spin-dry cycle, starting from rest and reaching an angular speed of 2.2 revolutions/s in 8.4 seconds. at this point the person doing the laundry opens the lid, and a safety switch turns off the washer, the tub slows to rest in 9.5 seconds. through how many...