Friday

April 18, 2014

April 18, 2014

Number of results: 115,881

**Physics**

A grindstone of radius 4.0m is initially spinning with an angular speed of 8.0 rad/s. The angular speed is then increased to 12 rad/s over 4.0s. Assume that the angular acceleration is constant. What is the average angular speed of grindstone?
*Monday, April 2, 2012 at 10:09pm by Natasha*

**Physics**

A skater spinning with angular speed of 1.5 rad/s draws in her outstretched arms thereby reducing her moment of inertia by a factor a 3. a) Find her angular speed. b)What is the ratio of her final angular momentum to her initial angular momentum? c)Did her mechanical energy ...
*Thursday, December 2, 2010 at 1:17pm by Tarren*

**Calculus(Pre)**

linear speed is speed along a given path, normally a straight line. angular speed is some changing angle that changes as a function of time. The change in angle per unit time is angular speed. For instance, if a car wheel makes a complete rotation in 10 seconds, its angular ...
*Thursday, November 17, 2011 at 4:43pm by bobpursley*

**physics help**

An electric circular saw is designed to reach its final angular speed, starting from rest, in 1.16 s. Its average angular acceleration is 375 rad/s2. Obtain its final angular speed.
*Friday, November 19, 2010 at 4:31pm by harry*

**Physics(Please help)**

A dentist causes the bit of a high-speed drill to accelerate from an angular speed of 1.44 x 104 rad/s to an angular speed of 5.05 x 104 rad/s. In the process, the bit turns through 1.77 x 104 rad. Assuming a constant angular acceleration, how long would it take the bit to ...
*Thursday, June 7, 2012 at 4:57pm by Hannah*

**Physics**

A dentist causes the bit of a high-speed drill to accelerate from an angular speed of 1.20x10^4 rad/s to an angular speed of 3.14x10^4 rad/s. In the process, the bit turns through 1.92x10^4 rad. Assuming a constant angular acceleration, how long would it take the bit to reach ...
*Tuesday, October 23, 2012 at 8:38am by Sam*

**Physics**

A centrifuge takes 100 s to spin up from rest to its final angular speed with constant angular acceleration. If a point located 8.00 cm from the axis of rotation of the centrifuge moves with a speed of 150 m/s when the centrifuge is at full speed, how many revolutions does the...
*Sunday, June 24, 2012 at 7:12pm by Bloom*

**Physics**

A solid disk with a mass of 100kg and a radius of 0.2m, turns clockwise through an angular displacement 10 rad when starting from rest to attain its maximum angular speed, of 1 revolution every 0.5s. What is the angular acceleration that the wheel experienced in order to ...
*Monday, February 20, 2012 at 1:58pm by Brittany*

**PHYSICS**

A solid disk with a mass of 100kg and a radius of 0.2m, turns clockwise through an angular displacement 10 rad when starting from rest to attain its maximum angular speed, of 1 revolution every 0.5s. What is the angular acceleration that the wheel experienced in order to ...
*Monday, February 20, 2012 at 10:47pm by Brittany*

**Physics**

A flywheel with a diameter of 2.45 m is rotating at an angular speed of 74.1 rev/min. (a) What is the angular speed of the flywheel in radians per second? (b) What is the linear speed of a point on the rim of the flywheel? (c) What constant angular acceleration (in revolutions...
*Wednesday, November 9, 2011 at 8:51am by kyle*

**Physics**

Starting from rest, a wheel undergoes constant angular acceleration for a period of time T. At what time after the start of rotation does the wheel reach an angular speed equal to its average angular speed for this interval?
*Tuesday, June 8, 2010 at 10:34pm by Ashley*

**Physics - still confused -Please help**

The velocity of pulling in the line is is V = w * R , which means Linear speed = (Angular speed)*(Radius) = 2.1m/9.7s = 0.2165 m/s Angular speed = 0.2165/0.3 = 0.7216 rad/s
*Saturday, February 25, 2012 at 10:36am by drwls*

**Physics**

A dentist causes the bit of a high-speed drill to accelerate from an angular speed of 1.20 104 rad/s to an angular speed of 3.14 104 rad/s. In the process, the bit turns through 1.92 104 rad. Assuming a constant angular acceleration, how long would it take the bit to reach its...
*Monday, October 22, 2012 at 1:34pm by Sam*

**physics**

I already took this course. It is your turn to try the problems. When we see exactly what you are having trouble with perhaps we can help. Remember Torque = rate of change of angular momentum = I alpha omega = w = angular speed angular momentum = I w alpha = dw/dt = rate of ...
*Wednesday, January 5, 2011 at 9:35am by Damon*

**Physics**

A steel bicycle wheel (without the rubber tire) is rotating freely with an angular speed of 18.00 rad/s. The temperature of the wheel changes from -100.0 to +300.0 degrees Celcius. No net external torque acts on the wheel, and the mass of the spokes is negligible. (a) Does the...
*Tuesday, February 15, 2011 at 4:59pm by Heather*

**physics**

as i have known that centripetal force is directly proportional to the angular speed square. so, what is the relationship between angular speed and centripetal force ? when centripetal force increase, does angular speed increase too? i need more explanation.
*Monday, July 29, 2013 at 2:43pm by kate*

**physics**

A centrifuge is a common laboratory instrument that separates components of differing densities in solution. This is accomplished by spinning a sample around in a circle with a large angular speed. Suppose that after a centrifuge in a medical laboratory is turned off, it ...
*Thursday, November 3, 2011 at 10:19pm by marie*

**Physics/Chemistry**

A steel bicycle wheel (without the rubber tire) is rotating freely with an angular speed of 18.00 rad/s. The temperature of the wheel changes from -100.0 to +300.0 degrees Celcius. No net external torque acts on the wheel, and the mass of the spokes is negligible. (a) Does ...
*Tuesday, February 15, 2011 at 6:40pm by Heather*

**Radians**

The angular speed of a large pulley wheel that has a radius of 15, is 50 revolutions/min. Find the angular speed and the rim speed of the smaller wheel that has a radius of 5. The rim speed is going to be the same. I got the angular speed but I can't figure out why the rim ...
*Tuesday, April 5, 2011 at 9:47pm by Jessica*

**Physics**

As seen from above, a playground carousel is rotating counterclockwise about its center on frictionless bearings. A person standing still on the ground grabs onto one of the bars on the carousel very close to its outer edge and climbs aboard. Thus, this person begins with an ...
*Saturday, November 3, 2012 at 1:42pm by Sam*

**physics**

an airplane propeller slows from an initial angular speed of 12.5rev/s to a final angular speed of 5rev/s during the process the propeller rotates through 21 rev. find the angular acceleration of the propeller if in radians per second squared, assuming its constant?
*Thursday, April 26, 2012 at 4:13pm by adan*

**Physics**

A wind turbine is initially spinning at a constant angular speed. As the wind's strength gradually increases, the turbine experiences a constant angular acceleration of 0.180 rad/s2. After making 2874 revolutions, its angular speed is 139 rad/s. A. What is the initial angular ...
*Friday, March 30, 2012 at 5:11pm by Natasha*

**physics**

A wind turbine is initially spinning at a constant angular speed. As the wind's strength gradually increases, the turbine experiences a constant angular acceleration 0.170 rad/s2. After making 2870 revolutions, its angular speed is 131 rad/s. (a) What is the initial angular ...
*Tuesday, July 16, 2013 at 2:08pm by kyle*

**Math**

angular speed=angle/time convert 220 degrees to radians.. Angle=220/360 ( 2PI) solve for angular speed. linear speed=angular speed* (3959+220)
*Sunday, October 21, 2012 at 5:22pm by bobpursley*

**Physics**

You failed to mention moment of inertia. I recommend you reread that section, it is what imposes resistance to change of angular motion. Torque=momentinertia*alpha (alpha is angular acceleartion, in radians/sec^2) Torque*time=momentinertia*change angular velocity angular speed...
*Friday, July 30, 2010 at 3:36pm by bobpursley*

**science- physics**

A rotating wheel requires 4.17 s to rotate through 37 rev. Its angular speed at the end of the 4.17 s interval is 104 rad/s. What is its constant angular acceleration? Assume the angular acceleration has the same sign as the angular velocity.
*Friday, October 19, 2012 at 12:38pm by joe*

**physics**

A disk rotates about its central axis starting from rest and accelerates with constant angular acceleration. At one time it is rotating at 7.8 rad/s; 60 radians later, its angular speed is 19 rad/s. Calculate (a) the angular acceleration (rad/s2), (b) the time required to ...
*Wednesday, November 13, 2013 at 4:37pm by kristy*

**physics**

Because angular momentum is conserved, I*w = (Moment of intertia)*(angular speed) remains constant Therefore 1.72*(15 rad/s)= 0.061*(final angular speed) Final angular speed = 15*1.72/0.061 = 423 rad/s Kinetic energy = (1/2)*I*w^2 increases by the same (w2/w1) factor, sinc I*w...
*Saturday, February 11, 2012 at 10:19am by drwls*

**Physics!**

A wheel rotates with a constant angular acceleration of 3.50 rad/s2. The angular speed of the wheel is 2.00 rad/s at t = 0. If the radius of the wheel is doubled, Are the following statements affected? If so, in what way? (Select all that apply.) (1)The angular speed at t = 2....
*Tuesday, December 1, 2009 at 12:40am by Diane M.*

**Physics**

In a tape recorder, the magnetic tape moves at a constant linear speed of 5.6 cm/s. To maintain this constant linear speed, the angular speed of the driving spool (the take-up spool) has to change accordingly. (a) What is the angular speed of the take-up spool when it is empty...
*Friday, October 21, 2011 at 12:15am by mymi*

**Physics**

1) A circular disk 0.20m in diameter starts from rest and accelerates with constant angular acceleration to an angular acceleration to an angular velocity of 210 rad/s in 10.00s. Find the angular acceleration and the angle which the disk has turned in degrees. 2) A car with ...
*Tuesday, April 9, 2013 at 5:40pm by Anonymous*

**physics**

The balance wheel of a watch oscillates with angular amplitude 1.7π rad and period 0.64 s. Find (a) the maximum angular speed of the wheel, (b) the angular speed of the wheel at displacement 1.7π/2 rad, and (c) the magnitude of the angular acceleration at ...
*Sunday, January 9, 2011 at 4:50pm by kylie*

**Physics, please help me today.**

four pulleys are connected by two belts. Pulley A (radius 15cm) is the drive pulley and it rotates at 10 rad/s. Pulley B (radius 10 cm) is connected by belt 1 to pulley A. Pulley B' (radius 5cm) is concentric with pulley B and is rigidly attached to it. Pulley C (radius 25cm) ...
*Friday, November 17, 2006 at 10:48am by Dawn*

**Physics**

Okay. So first for part b I know the formula I'm going to need is v=wr. That will relate the linear speed to the angular speed and we are given the radius. I'm still a little stuck though on the angular speed. I found the circumference of the wheel to be 10pi cm, and the space...
*Tuesday, July 27, 2010 at 11:54am by Mark*

**Physics**

A solid disk with a mass ok 100 kg and radius of 0.2m turns clockwise through an angular displacement 10 rad when starting from rest attain its maximum angular speed of 1 revolution every 0.5s. How much time did it take for the disk to go from rest to maximum angular speed?
*Tuesday, February 21, 2012 at 9:29pm by Brittany*

**Physics HELP!**

A centrifuge in a medical laboratory rotates at an angular speed of 3500 rev/ min. When switched off, it rotates through 41.0 revolutions before coming to rest. (a) Find the angular speed in rad/s. (b) Find the displacement in radians. (c) Find the constant angular ...
*Friday, October 26, 2012 at 4:35pm by Mel*

**AP Physics**

The average angular speed will be 1.55 rad/s. (average speed)*(stopping Time) = 2 pi * 46 radians Time(s) = (92 pi rad)/(1.55 rad/s) = 186.5 s Angular acceleration = -(Initial angular speed)/(Time to stop) Derive an equation for # of turns (n) vs t and use it to solve for t ...
*Sunday, January 27, 2008 at 6:39pm by drwls*

**Physics Please Help!**

A solid disk with a mass ok 100 kg and radius of 0.2m turns clockwise through an angular displacement 10 rad when starting from rest attain its maximum angular speed of 1 revolution every 0.5s. How much time did it take for the disk to go from rest to maximum angular speed?
*Tuesday, February 21, 2012 at 10:04pm by Brittany*

**Physics Angular Motion**

A wheel with a radius of 1.5m rotates at uniform angular speed. If a point on the rim of the wheel has a centripetal acceleration of 1.2 m/s/s whats the points tangential speed?
*Sunday, August 4, 2013 at 1:58pm by Xian*

**college physics (inertia)**

As a result of friction, the angular speed of a wheel changes with time according to dθ/dt = ω0 *e^-(σ*t) where ω0 and σ are constants. The angular speed changes from an initial angular speed of 3.08 rad/s to 1.58 rad/s in 3.92 s. a)Determine the ...
*Tuesday, March 30, 2010 at 4:10pm by eric*

**college physics (inertia)**

As a result of friction, the angular speed of a wheel changes with time according to dθ/dt = ω0 *e^-(σ*t) where ω0 and σ are constants. The angular speed changes from an initial angular speed of 3.08 rad/s to 1.58 rad/s in 3.92 s. a)Determine the ...
*Tuesday, March 30, 2010 at 5:38pm by eric*

**college physics (inertia)**

As a result of friction, the angular speed of a wheel changes with time according to dθ/dt = ω0 *e^-(σ*t) where ω0 and σ are constants. The angular speed changes from an initial angular speed of 3.08 rad/s to 1.58 rad/s in 3.92 s. a)Determine the ...
*Tuesday, March 30, 2010 at 6:01pm by eric*

**Physics**

An automatic drier spins wet clothes at an angular speed of 4.8 rad/s. Starting from rest, the drier reaches its operating speed with an average angular acceleration of 3.6 rad/s2. How long does it take the drier to come up to speed?
*Thursday, March 6, 2008 at 3:08pm by Zach*

**physics**

An automatic dryer spins wet clothes at an angular speed of 4.4 rad/s. Starting from rest, the dryer reaches its operating speed with an average angular acceleration of 4.2 rad/s2. How long does it take the dryer to come up to speed?
*Tuesday, July 16, 2013 at 2:03pm by fred*

**Physics- Elena please help!!!!**

A centrifuge in a medical laboratory rotates at an angular speed of 3500 rev/ min. When switched off, it rotates through 41.0 revolutions before coming to rest. (a) Find the angular speed in rad/s. (b) Find the displacement in radians. (c) Find the constant angular ...
*Monday, October 29, 2012 at 5:14pm by Tom*

**physics**

A skater spinning with angular speed of 1.5 rad/s draws in her outstretched arms thereby reducing her moment of inertia by a factor a 3. a) Find her final angular speed. b)What is the ratio of her final angular momentum to her initial angular momentum? c) Determine the ratio ...
*Thursday, December 2, 2010 at 8:07pm by Kevin*

**physics**

5) A person on a motor cycle gains a speed of 10kmph to 60kmph in 10 secs. The angular rotation of the needle in the speedometer is about 200 degrees. What will be the angular speed in degrees/sec?
*Monday, August 8, 2011 at 5:34am by Anonymous*

**Physics**

Pilots can be tested for the stresses of flying high-speed jets in a whirling "human centrifuge," which takes 1.8 min to turn through 21 complete revolutions before reaching its final speed. 1. What is the angular acceleration?(rev/min^2) 2. What is the final angular speed in ...
*Monday, March 5, 2012 at 9:05pm by Ben*

**Physics (Angular Momentum)**

Use the information on mass, radius and solidity to get the moment of intertia. I = (2/5)M*R^2 = 0.0064 kg*m^2 The angular speed is w = V/R = 10 m/s/0.1 m = 100 rad/s The angular momentum about the center is I*w Where it is does not matter
*Friday, July 13, 2012 at 4:28pm by drwls*

**PHYSICS HELP**

Torque is equal to the change in angular momentum divided by the change in time. Initial angular momentum is equal to the rotational inertia times the angular speed. Final angular momentum is zero because it stopped. Hope this helps!
*Tuesday, November 13, 2007 at 11:18pm by Glenn*

**Physics **

A figure skater is spinning with an initial angular speed of 6.9rad/s. She then pulls her arms in, reducing her moment of inertia to 0.38 times its original value. What is her angular speed after pulling in her arms?
*Thursday, March 8, 2012 at 1:55pm by Jackie *

**physics**

Some bacteria are propelled by biological motors that spin hair-like flagella. A typical bacterial motor turning at a constant angular velocity has a radius of 1.70e-8 m, and a tangential speed at the rim of 2.32 e-5 m/s. a) What is the angular speed (the magnitude of the ...
*Friday, March 30, 2012 at 5:40pm by Natasha*

**Physics**

Some bacteria are propelled by motors that spin hair-like flagella. A typical bacterial motor turning at a constant angular velocity has a radius of 1.9x10-8m, and a tangential speed at the rim of 2.5x10-5 m/s. (a) What is the angular speed (the magnitude of the angular ...
*Thursday, June 7, 2012 at 12:43pm by Jessi*

**Physics help please!!!**

The angular speed of digital video discs (DVDs) varies with whether the inner or outer part of the disc is being read. (CDs function in the same way.) Over a 133 min playing time, the angular speed varies from 570 rpm to 1600 rpm. Assuming it to be constant, what is the ...
*Saturday, February 18, 2012 at 11:47am by john*

**physics**

A centrifuge in a medical laboratory rotates at an angular speed of 3300 rev/ min. When switched off, it rotates through 59.0 revolutions before coming to rest. (a) Find the angular speed in rad/s.
*Sunday, November 4, 2012 at 5:33pm by Anonymous*

**physics**

9 rev/sec = 18 pi radians/sec. That is called tha angular speed, and usually has a symbol omega. Here, we often use w. You need to provide a dimension along with the "diameter" number. Multiply half the diameter (the radius) by the angular speed in radians per second to get ...
*Thursday, March 3, 2011 at 8:48am by drwls*

**PHYSICS 3**

A solid disk (mass = 1 kg, R=0.5 m) is rolling across a table with a translational speed of 9 m/s. a.) What must the angular speed of the disk be? rad/s d.) The disk then rolls up a hill of height 2 m, where the ground again levels out. Find the translational and rotational ...
*Monday, October 20, 2008 at 4:34am by kelsey*

**physics**

As a result of friction, the angular speed of a wheel changes with time according to d(theta)/dt = w0 e^-(aplpha*t) where w0 and alpha are constants. The angular speed changes from an initial angular speed of 4.87 rad/s to 4.27 rad/s in 33.93s. A) Determine the magnitude of ...
*Friday, October 26, 2012 at 6:19pm by michelle*

**physics**

A disk rotates about its central axis starting from rest and accelerates with constant angular acceleration. At one time it is rotating at 7 rev/s. 55 revolutions later, its angular speed is 21 rev/s. (a) Calculate the angular acceleration. (b) Calculate the time required to ...
*Sunday, March 11, 2007 at 10:46pm by winterWX*

**Physics**

A diver performing a double somersault spins at an angular speed of 4.5 π rad/s precisely 0.70s after leaving the platform. Assuming the diver begins with zero initial angular speed and accelerates at a constant rate, what is the diver’s angular acceleration during the ...
*Wednesday, March 28, 2012 at 2:12pm by Ethan*

**physics**

A machine part rotates at an angular speed of 0.38 rad/s; its speed is then increased to 3.46 rad/s using an angular acceleration of 0.61 rad/s2. Find the angle through which the part ro- tates before reaching this final speed. Answer in units of rad
*Friday, October 21, 2011 at 7:48pm by phys101*

**physics**

What is the angular momentum (in kilogram-meter^2/second) of a 300.0 g ball rotating on the end of a string in a circle of radius 1.87 m at an angular speed of 1.50 rad/s? Is there certain equations to find angular momentum for different shapes?
*Thursday, April 12, 2012 at 5:37pm by Jessica*

**Physics(Please respond)**

Some bacteria are propelled by motors that spin hair-like flagella. A typical bacterial motor turning at a constant angular velocity has a radius of 1.9x10-8m, and a tangential speed at the rim of 2.7x10-5 m/s. (a) What is the angular speed (the magnitude of the angular ...
*Friday, June 8, 2012 at 1:12pm by Hannah*

**Physics**

A carousel at a carnival has a diameter of 6.0 m. The ride starts from rest and accelerates at a constant angular acceleration to an angular speed of 0.7 rev/s in 8.8 s. (a) What is the value of the angular acceleration? 1 0.499 rad/s^2 (b) What are the centripetal and angular...
*Friday, October 21, 2011 at 12:07am by mymi*

**algebra2trig**

the angular speed is 2π/27 radians/second (all the other pieces of data are irrelevant for the angular speed. If you wanted the horse's linear speed then they would enter the picture.)
*Thursday, April 28, 2011 at 1:46am by Reiny*

**Physics**

M*R*w^2 w is the angular speed M is the mass R is the radius The angular acceleration doesn't matter in the radial direction.
*Saturday, August 18, 2012 at 7:47pm by drwls*

**Physics**

When it starts the slide, the force of friction is just equal to centripetal force. mass*angular speed *radius= mu*mass*g solve for angular speed.
*Sunday, November 18, 2007 at 6:29pm by bobpursley*

**Physics(Please help)**

Some bacteria are propelled by motors that spin hair-like flagella. A typical bacterial motor turning at a constant angular velocity has a radius of 1.9x10-8m, and a tangential speed at the rim of 2.7x10-5 m/s. (a) What is the angular speed (the magnitude of the angular ...
*Saturday, June 9, 2012 at 4:24pm by Hannah*

**Angular Speed-Physics**

Stars originate as large bodies of slowly rotating gas. Because of gravity, these clumps of gas slowly decrease in size. What happens to the angular speed of a star as it shrinks? Explain.
*Thursday, November 1, 2012 at 12:47pm by Kaitlyn*

**physics**

A machine part rotates at an angular speed of 0.77 rad/s; its speed is then increased to 1.76 rad/s using an angular acceleration of 0.29 rad/s 2 . Find the angle through which the part rotates before reaching this ﬁnal speed. Answer in units of rad
*Thursday, December 13, 2012 at 10:23pm by Anonymous*

**Physics**

A 0.58- kg flashlight is swung at the end of a string in a horizontal circle of 0.85- m radius with a constant angular speed. If no torque is applied, what must the radius become if the angular speed of the flashlight is to be halved?
*Wednesday, November 18, 2009 at 3:56pm by kate*

**Physics**

A non-rotating cylindrical disk of moment of inertia I is dropped onto an identical disk rotating at angular speed w. Assuming no external torques, what is the final common angular speed of the two disks?
*Wednesday, April 21, 2010 at 9:39am by Aja *

**Physics**

A person on a rotating stool with arms stretched out rotates at an angular speed of 5.00 rad/s. On bringing in his arms, the angular speed increases to 7.50 rad/s. By what factor does the moment of inertia change?
*Monday, November 4, 2013 at 1:38pm by Mikhail*

**Physics**

Angular acceleration is usually expressed in radians/s^2 and angular speed in radians/s. In your case, 21/1.8 = 11.67 is the average speed in rev/min. The final speed is twice that, or 23.33 rev/min The angular acceleration is 23.33 rev/min divided by 1.8 min, which is 12.96 ...
*Monday, March 5, 2012 at 9:05pm by drwls*

**Physics**

If angular momentum is conserved, then the sum of the train anglular momentum must be equal and opposite to the wheel. The speed v must be the train speed v'and the tangential speed v" of the wheel. Using v', and v", you can determine the angular speed of the wheel (remember ...
*Wednesday, February 13, 2008 at 9:06pm by bobpursley*

**physics**

A 4.00-m length of light nylon cord is wound around a uniform cylindrical spool of radius 0.500 m and mass 1.00 kg. The spool is mounted on a frictionless axle and is initially at rest. The cord is pulled from the spool with a constant acceleration of magnitude 2.86 m/s2. (a) ...
*Monday, March 19, 2012 at 10:47am by Mike*

**Physics**

w = w0 + a*t theta = w0*t + 1/2*a*t^2 where w is the angular speed, w0 is the initial angular speed, and a is the angular acceleration, and theta is the angle turned in radians, so 3.14*10^4 = 1.2*10^4 + a *t 1.92*10^4 = 1.2*10^4*t + .5*a*t^2 Solve this system of equations ...
*Tuesday, October 23, 2012 at 8:38am by Jennifer*

**PHYSICS--SHM**

PLZ HELP. THANKS. The balance wheel of a watch oscillates with an angular amplitude of rad and a period of 0.220 s. a) Find the maximum angular speed of the wheel. (b) Find the angular speed of the wheel when its displacement is /4 rad. (c) Find the magnitude of the angular ...
*Saturday, January 27, 2007 at 9:40pm by wooh*

**Physics**

Two people start at the same place and walk around a circular lake in opposite directions. One has an angular speed of 1.2 10-3 rad/s, while the other has an angular speed of 3.4 10-3 rad/s. How long will it be before they meet?
*Wednesday, March 26, 2008 at 6:08pm by Erich*

**physics**

A centrifuge takes 1 minute to turn through 20 complete revolutions before reaching it's final speed. What is the angular acceleration (assumed constant) and what was it's final angular speed in rpm? How do I solve this without knowing the radius of the centrifuge?
*Friday, March 25, 2011 at 5:09pm by Mark*

**principles of physics**

When a skater brings her arms in when spinning, she increases her ____________________. A) angular speed.B) Both of these.C) Neither of these.D) angular momentum.
*Friday, March 2, 2012 at 11:14am by CHRIS*

**physics**

a remote controlled car's wheel accelerates at 22.4 rad/s^2. if the wheel begins with an angular speed of 10.8 rad/s what is the wheel's angular speed after exactly 3 full turns?
*Thursday, February 12, 2009 at 12:49am by luke*

**Physics Inertia : Merry-go-round**

if you want to find the final angular speed, wf, you take: momentinertiaMerryGoRound(initial angular speed) = (momentinertiaMerryGoRound + momentinertiaKid)(wf) then solve for wf
*Monday, April 19, 2010 at 11:08pm by nora*

**physics**

A remote-controlled car’s wheel accelerates at 22.7 rad/s. If the wheel begins with an angular speed of 11.0 rad/s, what is the wheel’s angular speed after exactly twenty full turns?
*Tuesday, November 13, 2012 at 6:17pm by Alyssa*

**physics**

A remote-controlled car’s wheel accelerates at 22.7 rad/s. If the wheel begins with an angular speed of 11.0 rad/s, what is the wheel’s angular speed after exactly twenty full turns?
*Tuesday, November 13, 2012 at 6:21pm by Alyssa*

**Physics**

A cylinder with a diameter of 16 rolls with an angular speed of 0.055 on a level surface. If the cylinder experiences a uniform tangential acceleration of 0.020 without slipping until its angular speed is 1.0 , through how many complete revolutions does the cylinder rotate ...
*Tuesday, June 18, 2013 at 9:13am by Anonymous*

**Trig**

linear speed1= r1*angular speed linear speed2= r2*angular speed difference= (r1-r1)angular speed
*Wednesday, September 12, 2007 at 11:30am by bobpursley*

**math**

ANGULAR SPEED OF A RACE CAR. A race car is driven around a circular track at a constant speed of 180miles per hour. If the diameter of the track is 1/2mile, what is the angular speed of the car? Express your answer in revolutions per hour(which is equivalent to laps per hour) ...
*Wednesday, June 13, 2007 at 8:14pm by michelle*

**physics**

never mind- I figured it out. ok so then, for the angular speed, would I sinply use wfinal ^2=winitial^2+2(angular acceleration)(distance) ?
*Monday, March 24, 2008 at 4:18pm by Ty*

**physics**

What is the angular momentum of a 0.200- ball rotating on the end of a thin string in a circle of radius 1.45 at an angular speed of 13.0 ?
*Sunday, May 6, 2012 at 3:44pm by juan *

**Physics**

Two astronauts, each having a mass M are connected by a length of rope of length d have a negligible mass. They are isolated in space, orbiting their center of mass at an angular speed of ù0. By pulling on the rope, one of the astronauts shortens the total distance between ...
*Wednesday, November 14, 2012 at 7:01pm by Alphonse*

**physics**

Two people start at the same place and walk around a circular lake in opposite directions. One has an angular speed of 2.46 x 10-3 rad/s, while the other has an angular speed of 7.91 x 10-3 rad/s. How long will it be before they meet?
*Tuesday, July 16, 2013 at 1:55pm by cindy*

**Physics**

You doubled moment of inertia. Angular momentum total must be the same. If you keep angular momentum the same, then angular speed must be 1/2 the original. Rotational energy is not conserved.
*Wednesday, April 21, 2010 at 9:39am by bobpursley*

**physics**

A 12 g CD with a radius of 6.0 cm rotates with an angular speed of 40 rad/s. What is its kinetic energy? What angular speed must the CD have if its kinetic energy is to be doubled?
*Saturday, October 17, 2009 at 10:06pm by angel*

**physics**

The speed of a moving bullet can be determined by allowing the bullet to pass through two rotating paper disks mounted a distance d apart on the same axle (Fig. below). From the angular displacement of the two bullet holes in the disks and the rotational speed of the disks, we...
*Saturday, May 18, 2013 at 12:17pm by Anonymous*

**Physics 101**

What is the angular momentum of a 0.705kg ball rotating on the end of a thin string in a circle of radius 0.800m at an angular speed of 12.8rad/s ?
*Friday, October 25, 2013 at 4:38pm by mary*

**physics**

A Ferris wheel rotates at an angular velocity of 0.20 rad/s. Starting from rest, it reaches its operating speed with an average angular acceleration of 0.029 rad/s2. How long does it take the wheel to come up to operating speed?
*Monday, November 15, 2010 at 10:15am by michelle*

**physics**

A Ferris wheel rotates at an angular velocity of 0.28 rad/s. Starting from rest, it reaches its operating speed with an average angular acceleration of 0.021 rad/s2. How long does it take the wheel to come up to operating speed?
*Tuesday, July 16, 2013 at 1:52pm by gregory*

**Trigonometry**

A race car is driven around a circular track at a constant speed of 180mph. If the diameter is 1/2 mile, what is the angular speed of the car? Express your answer in revolutions per hour. The formula for angular speed is w=theta (in radians)/time
*Monday, April 12, 2010 at 3:01pm by Anonymous*

**Trigonometry**

A race car is driven around a circular track at a constant speed of 180mph. If the diameter is 1/2 mile, what is the angular speed of the car? Express your answer in revolutions per hour. The formula for angular speed is w=theta (in radians)/time
*Monday, April 12, 2010 at 4:50pm by Anonymous*

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