Friday

April 18, 2014

April 18, 2014

Number of results: 14,894

**Physics**

I already figured out the answers to some but I need help with two more. 1) A disk with an initial angular velocity ω0 = 4.5 rad/s experiences a constant angular acceleration of α = 7.5 rad/s2 for time t = 15 s. Please answer the following questions. ω0 = 4.5 ...
*Wednesday, April 2, 2014 at 11:06am by Michelle*

**college phyiscs**

the angular acceleration is 1.60/160 in radian/s^2 I dont see how anything can be solved without know how long it accelerated at this acceleration. Displacement is a function of time, and acceleration.
*Sunday, October 11, 2009 at 11:57am by bobpursley*

**physics**

Time to stop = (angular displacement)/(average angular velocity) = 11*2*pi rad/(9.0 rad/s) = 7.68 s Angular acceleration = -(18 rad/s)/(7.68 s) = -2.34 rad/s^2
*Friday, February 25, 2011 at 2:16am by drwls*

**physics**

(a) What is the tangential acceleration of a bug on the rim of a 6.0 in. diameter disk if the disk moves from rest to an angular speed of 79 rev/min in 5.0 s? (b) When the disk is at its final speed, what is the tangential velocity of the bug? (c) One second after the bug ...
*Sunday, March 28, 2010 at 1:21am by Kelsey*

**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**

A planet orbits its star in a circular orbit (uniform circular motion) of radius 1.62x10^11 m. The orbital period of the planet around its star is 37.0 years. Determine the following quantities for this orbital motion: Angular acceleration , Tangential acceleration, Radial ...
*Sunday, November 13, 2011 at 10:45am by sand*

**physics**

A planet orbits its star in a circular orbit (uniform circular motion) of radius 1.62x10^11 m. The orbital period of the planet around its star is 37.0 years. Determine the following quantities for this orbital motion: Angular acceleration , Tangential acceleration, Radial ...
*Sunday, November 13, 2011 at 9:06pm by sand*

**physics**

A planet orbits its star in a circular orbit (uniform circular motion) of radius 1.62x10^11 m. The orbital period of the planet around its star is 37.0 years. Determine the following quantities for this orbital motion: Angular acceleration , Tangential acceleration, Radial ...
*Monday, November 14, 2011 at 9:53am by sand*

**physics**

A planet orbits its star in a circular orbit (uniform circular motion) of radius 1.62x10^11 m. The orbital period of the planet around its star is 37.0 years. Determine the following quantities for this orbital motion: Angular acceleration , Tangential acceleration, Radial ...
*Tuesday, November 15, 2011 at 11:06am by sand*

**physics**

A planet orbits its star in a circular orbit (uniform circular motion) of radius 1.62x10^11 m. The orbital period of the planet around its star is 37.0 years. Determine the following quantities for this orbital motion: Angular acceleration , Tangential acceleration, Radial ...
*Tuesday, November 15, 2011 at 4:19pm by sand*

**Physics (Circular Motion!!)**

A) Top angular speed is wmax = 2 pi radians/1.1 s = 5.71 rad/s Angular acceleration during first 30 s: alpha = 5.71/30 = 0.1904 rad/s^2 Tangential acceleration = R*alpha = 0.952 m/s^2 B) centripetal acceleration at top speed = R*wmax^2 = 163 m/s^2 = 16.6 g's
*Thursday, September 2, 2010 at 12:52pm by drwls*

**Physics**

Suppose you exert a force of 180 N tangential to a 0.280-m-radius 75.0-kg grindstone (a solid disk). (a)What torque is exerted? (b) What is the angular acceleration assuming negligible opposing friction? (c) What is the angular acceleration if there is an opposing frictional ...
*Sunday, July 14, 2013 at 5:05pm by Justin*

**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**

I need help with this problem. A ceiling fan is turned on and a net torque of 2.0 Nm is applied to the blades. The blades have a total moment of inertia of 0.24 kgm2. What is the angular acceleration of the blades in rad/s2? The formula is well known: Torque= momentof inertia...
*Wednesday, March 21, 2007 at 7:06pm by Jim*

**physics**

wr = v a = r dw/dt 1.4 = r dw/dt dw/dt = angular acceleration = 1.4/r = 2.8/.57 assume constant angular deacceleration radial acceleration = w^2 r tangential acceleration = r dw/dt (we know dw/dt from above) w r = v = 3 m/s at t = 0 wo = 3/r w = wo - (dw/dt)t that gives you w^...
*Friday, November 26, 2010 at 5:02pm by Damon*

**physics**

A 5.0 kg \rm kg, 52-cm \rm cm-diameter cylinder 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. a)What is the magnitude of the cylinder's initial angular...
*Friday, December 6, 2013 at 2:03pm by Chloe *

**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**

The flywheel of a steam engine runs with a constant angular speed of 164 rev/min. When steam is shut off, the friction of the bearings and the air brings the wheel to rest in 1.6 h. I figured out the constant angular acceleration=1.71 rev/min2 but im not sure how to find:What ...
*Tuesday, September 28, 2010 at 10:43pm by question*

**physics**

A pulley rotating in the counterclockwise direction is attached to a mass suspended from a string. The mass causes the pulley's angular velocity to decrease with a constant angular acceleration α = -2.2 rad/s2. If the pulley's initial angular velocity is ω = 5.37 rad...
*Thursday, November 4, 2010 at 8:28pm by aok*

**physics**

1. A centrifuge in a medical laboratory rotates at an angular speed of 3650 rev/min. When switched off, it rotates through 50.0 revolutions before coming to rest. Find the constant angular acceleration of the centrifuge. 2. A ball of mass 0.120 kg is dropped from rest from a ...
*Sunday, July 6, 2008 at 11:03pm by Elisa*

**Physics**

(a) Divide the final angular velocity (in rad/s, NOT rpm) by the time interval. (b) angle = (1/2)*(angular acceleration)*t^2 OR (1/2)*(final angular velocity)*time
*Friday, October 7, 2011 at 5:51pm by drwls*

**physics**

Start withe the equation Torque = (Moment of inertia)(angular acceleration) which is sometimes written in textbooks as T = I*alpha (a) The angular acceleration will not depend upon how much thread has been pulled, but the angular velocity achieved (Wmax)will depend upon that ...
*Friday, March 26, 2010 at 11:01am by drwls*

**math**

An ice skater rotating around a vertical axis increases in angular velocityfrom 450degrees/s to 610degrees/s in 2.3 seconds. Find the angular acceleration
*Wednesday, November 4, 2009 at 8:42pm by stew*

**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**

ω2=ω1)+angular acceleration*time or time = (ω2-ω1)/angular acceleration =(0.28-0)/0.021 =40/3 sec.
*Tuesday, July 16, 2013 at 1:52pm by MathMate*

**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*

**Physics**

A 46.5-cm diameter disk rotates with a constant angular acceleration of 2.4 rad/s2. It starts from rest at t = 0, and a line drawn from the center of the disk to a point P on the rim of the disk makes an angle of 57.3° with the positive x-axis at this time. (Hint: Remember the...
*Monday, November 30, 2009 at 2:49pm by Ed*

**Physics**

A child pushes a merry go-round from rest to a final angular speed of 0.6 rev/s with constant angular acceleration. In doing so, the child pushes the merry-go-round 1.8 revolutions. What is the angular acceleration of the merry go-round? rad/s^2 This is how i did this, but its...
*Friday, March 23, 2012 at 5:39pm by Adam*

**Physics**

A flywheel of a radius .5 m starts from rest and under goes a uniform angular acceleration of 3 rad/sec2 for a period of 5 seconds. Find the angular velocity of the flywheel at the end of this time? Find the angular displacement (in radians) that the wheel turns through during...
*Wednesday, May 9, 2012 at 1:19am by Mary*

**Physics**

An electronic motor is revolving at 2000rpm. After 3sec, it is moving at 150rpm. Determine the angular acceleration. What is angular momentum of the electric motor if the rotational inertia is 18.kg.square meter in initial velocity? In final velocity? What is the average ...
*Sunday, December 16, 2012 at 11:05am by Bob*

**Physics**

A 46.5-cm diameter disk rotates with a constant angular acceleration of 2.4 rad/s2. It starts from rest at t = 0, and a line drawn from the center of the disk to a point P on the rim of the disk makes an angle of 57.3° with the positive x-axis at this time. (Hint: Remember the...
*Saturday, November 28, 2009 at 6:03pm by Ed*

**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 person is riding a bicycle, the wheels of a bicycle have an angular velocity of +20.5 rad/s. Then, the brakes are applied. In coming to rest, each wheel makes an angular displacement of +12.0 revolutions. (a) How much time does it take for the bike to come to rest? (b) What ...
*Wednesday, November 10, 2010 at 8:14pm by sean*

**physics**

A person is riding a bicycle, the wheels of a bicycle have an angular velocity of +24.0 rad/s. Then, the brakes are applied. In coming to rest, each wheel makes an angular displacement of +16.0 revolutions. (a) How much time does it take for the bike to come to rest? s (b) ...
*Thursday, November 17, 2011 at 8:53pm by Taylor*

**physics**

A coin with a diameter of 1.9 cm is dropped on edge onto a horizontal surface. The coin starts out with an initial angular speed of 19 rad/s and rolls in a straight line without slipping. The rotation slows with an angular acceleration of magnitude 2.1 rad/s2. What is the ...
*Monday, September 27, 2010 at 7:54pm by help*

**Physics**

Consider a 59-cm-long lawn mower blade rotating about its center at 2990 rpm. (a) Calculate the linear speed of the tip of the blade. (b) If safety regulations require that the blade be stoppable within 3.0 s, what minimum angular acceleration will accomplish this? Assume that...
*Saturday, June 16, 2012 at 10:33am by Camilla*

**physics**

Search: A person is riding a bicycle, the wheels of a bicycle have an angular velocity of +18.0 rad/s. Then, the brakes are applied. In coming to rest, each wheel makes an angular displacement of +11.0 revolutions. How much time does it take for the bike to come to rest? What ...
*Friday, February 25, 2011 at 2:16am by Taylor*

**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**

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*

**Please check solution**

A uniform solid disk with a mass of 40.3 kg and a radius of 0.454 m is free to rotate about a frictionless axle. Forces of 90.0 N and 125 N are applied to the disk (a) What is the net torque produced by the two forces? (Assume counterclockwise is the positive direction (b) ...
*Monday, May 7, 2007 at 1:18pm by Papito*

**physics**

The blades of a ceiling fan have a radius of 0.340m and are rotating about a fixed axis with an intial angular velocity of +1.25rad/s2. When the switch on the fan is turned to a higher speed, the blades acire an angular acceleration of +2.55rad/s2. After 0.480s have elapsed ...
*Tuesday, January 21, 2014 at 4:35pm by bre*

**Biomechanics **

A diver is trying a new more and is attempting to increase his angular acceleration in order to increase the angular displacement and thus produce more rotations from a standing start on the board the diver accelerates at 950 degree/s/s.what is the angular displacement over 0....
*Saturday, March 9, 2013 at 4:02am by Vanitha*

**physics**

A 175 kg merry-go-round in the shape of a uniform, solid, horizontal disk of radius 1.50 m is set in motion by wrapping a rope about the rim of the disk and pulling on the rope. What constant force would have to be exerted on the rope to bring the merry-go-round from rest to ...
*Sunday, July 20, 2008 at 7:32pm by Elisa*

**physics**

A fan blade is rotating with a constant angular acceleration of +8.4 rad/s2. At what point on the blade, as measured from the axis of rotation, does the magnitude of the tangential acceleration equal that of the acceleration due to gravity?
*Tuesday, July 16, 2013 at 2:50pm by frank*

**physics**

Moment of force? What is that? Torque? Torque= momentofInertia*angular acceleration angular acceleation is not specified.
*Monday, November 15, 2010 at 5:04am by bobpursley*

**Physics - Angular Momentum**

When the angular momentum changes, the 'change' in the angular momentum vector (ie. dL) is ____. [a.] perpendicular to the torque vector. [b.] parallel to the angular momentum vector. [c.] parallel to the torque vector. .. im confused on this one.. i think it's [A]. am i right...
*Sunday, April 8, 2007 at 12:34am by COFFEE*

**PHYSICS**

A fan blade is rotating with a constant angular acceleration of +13.7 rad/s2. At what point on the blade, as measured from the axis of rotation, does the magnitude of the tangential acceleration equal that of the acceleration due to gravity?
*Thursday, October 28, 2010 at 4:31pm by JOHN*

**Physics**

Torque = (moment of inertia) x (angular acceleration) = 50 N*m The moment of inertia is I = (1/2) M*R^2 = 281.25 kg*m^2 The maximum angular velocity you want to achieve is w = 1200 rev/min * (2 pi/60) = 125.66 rad/s The angular acceleration rate is alpha = 125.66 rad/s / t ...
*Saturday, July 23, 2011 at 5:45pm by drwls*

**physics**

displacement= 1/2 angulare acceleration*t^2 solve fodr angular acceleration
*Monday, March 14, 2011 at 5:48pm by bobpursley*

**physics**

Two objects of equal mass are on a turning wheel. Mass 1 is located at the rim of the wheel while mass 2 is located halfway between the rim and the axis of rotation. The wheel is rotating with a non-zero angular acceleration. For each of the following statements select the ...
*Tuesday, March 20, 2012 at 9:26pm by Miriam*

**Physics**

Two objects of equal mass are on a turning wheel. Mass 1 is located at the rim of the wheel while mass 2 is located halfway between the rim and the axis of rotation. The wheel is rotating with a non-zero angular acceleration. For each of the following statements select the ...
*Wednesday, March 21, 2012 at 7:35pm by Miriam*

**physics**

A person holds a ladder horizontally at its center. Treating the ladder as a uniform rod of length 3.55 m and mass 10.31 Kg, find the torque the person must exert on the ladder to give it an angular acceleration of 0.406 rad/s2. Should I set the given angular acceleration ...
*Monday, June 4, 2007 at 4:27pm by anne*

**Physics**

constant acceleration a d = (1/2) a t^2 by the way the angular acceleration alpha = a/R
*Saturday, August 7, 2010 at 2:46pm by Damon*

**physics **

A merry-go-round starts from rest and accelerates uniformly over 29.0 s to a final angular velocity of 5.35 rev/min. (a) Find the maximum linear speed of a person sitting on the merry-go-round 4.50 m from the center. (b) Find the person's maximum radial acceleration. (c) Find ...
*Tuesday, March 1, 2011 at 12:08pm by Anonymous*

**physics**

A merry-go-round starts from rest and accelerates uniformly over 26.0 s to a final angular velocity of 5.50 rev/min. (a) Find the maximum linear speed of a person sitting on the merry-go-round 4.25 m from the center. (b) Find the person's maximum radial acceleration. (c) Find ...
*Wednesday, March 14, 2012 at 1:23pm by John*

**physics**

if the angular quantities theta omega and angular acceleration were specified in terms of degrees rather than radians how would the kinematics equations for uniformly accelerated rotational motion have to be altered
*Monday, February 28, 2011 at 9:03pm by luna*

**physics**

if the angular quantities theta omega and angular acceleration were specified in terms of degrees rather than radians how would the kinematics equations for uniformly accelerated rotational motion have to be altered
*Monday, February 28, 2011 at 9:03pm by luna*

**Physics**

A person is riding a bicycle, the wheels of a bicycle have an angular velocity of +18.5 rad/s. Then, the brakes are applied. In coming to rest, each wheel makes an angular displacement of +14.5 revolutions. (a) How much time does it take for the bike to come to rest? 1 s (b) ...
*Tuesday, February 22, 2011 at 11:01pm by Lauren*

**physics**

What is a tire's angular acceleration if the tangential acceleration at a radius of 0.15 m is 9.4 x 10-2 m/s2?
*Monday, March 19, 2012 at 10:32am by Anonymous*

**Physics**

A solid sphere of uniform density starts from rest and rolls without slipping a distance of d = 3.4 m down a q = 29° incline. The sphere has a mass M = 3.7 kg and a radius R = 0.28 m. What is the magnitude of the frictional force on the sphere? --The other person did this for ...
*Friday, April 9, 2010 at 3:43pm by rufy*

**Physics**

a turntable is designed to acquire an angular velocity of 38.6 rev/s in 0.5 s, starting from rest. Find the average angular acceleration of the turntable during the 0.5 s period.
*Tuesday, November 23, 2010 at 6:51pm by Anonymous*

**Physics(Please help)**

A fan blade is rotating with a constant angular acceleration of +12.4 rad/s2. At what point on the blade, as measured from the axis of rotation, does the magnitude of the tangential acceleration equal that of the acceleration due to gravity? I do not know how to start this.
*Tuesday, June 5, 2012 at 3:34pm by Hannah*

**science**

please help...A wheel 1.0m in diameter is rotating about a fixed axis with an initial angular velocity of 2rev.s-1.the angular acceleration is 3rev.s-1. (1)compute the angular velocity after 6s. (2)through what angle has the wheel turned in this time interval? (3)what is the ...
*Monday, January 2, 2012 at 3:14am by anonymous*

**physics**

A tire placed on a balancing machine in a service station starts from rest and turns through 10.8 revolutions in 8.48 s before reaching its final angular speed. Calculate its angular acceleration.
*Monday, March 14, 2011 at 5:48pm by Emily*

**Physics**

A tire placed on a balancing machine in a service station starts from rest and turns through 4.71 revolutions in 1.29 s before reaching its final angular speed. Calculate its angular acceleration.
*Sunday, September 30, 2012 at 4:52pm by Arthur*

**physics**

A tire placed on a balancing machine in a service station starts from rest and turns through 4.82 revolutions in 1.48 s before reaching its final angular speed. Calculate its angular acceleration.
*Thursday, October 4, 2012 at 8:36pm by Emily *

**physics**

A tire placed on a balancing machine in a service station starts from rest and turns through 4.82 revolutions in 1.48 s before reaching its final angular speed. Calculate its angular acceleration.
*Thursday, October 4, 2012 at 8:38pm by Emily *

**physics**

A tire placed on a balancing machine in a service station starts from rest and turns through 4.82 revolutions in 1.48 s before reaching its final angular speed. Calculate its angular acceleration
*Sunday, October 7, 2012 at 7:51pm by Emily *

**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*

**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**

The GPE at the starting point is mgL/2 The GPE at the end is zero. The gain of KE equals then mgL/2 KE of this rotating rod is 1/2 I w^2 mgL/2=1/2 *1/3 mL^2*w^2 solve for w b) angular acceleration = 1/I *torque where torque= mg*L/2 angular acceleration= 3/mL^2 *mgL/2 = 3/2 Lg ...
*Thursday, August 11, 2011 at 6:18pm by bobpursley*

**physics**

Angular acceleration = Torque/(moment of inertia) The moment of inertia is (1/2) M R^2 for a disk. After 10 seconds, the number of radians turned is theta = (1/2)(angular acceleration)*(10 s)^2 Divide that by 2 pi for the number of revolutions. Rotational work done is (torque...
*Saturday, December 4, 2010 at 8:46am by drwls*

**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 person is riding a bicycle, and its wheels have an angular velocity of +15.5 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 +15.5 revolutions. (a) How much time does it take for the ...
*Wednesday, November 3, 2010 at 9:44pm by james*

**physics**

After fixing a flat tire on a bicycle you give the wheel a spin. (a) If its initial angular speed was 5.41 rad/s and it rotated 13.7 revolutions before coming to rest, what was its average angular acceleration?
*Friday, November 5, 2010 at 7:40pm by aok*

**physics, bike**

After fixing a flat tire on a bicycle you give the wheel a spin. Its initial angular speed was 6.50 and it rotated 15.2 revolutions before coming to rest.What was its average angular acceleration?
*Thursday, January 13, 2011 at 6:59pm by john*

**Physics**

Your calculations look OK except: (1) w has to be in radians per second, not rpm. (2) You need to include dimensions with the numbers. For example v is in m/s and a is in m/s^2. For the time required, divide the final angular velocity of C by its angular acceleration rate, 5.7...
*Friday, February 10, 2012 at 10:01pm by drwls*

**physics - drwls?**

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 ...
*Monday, March 12, 2007 at 1:25am by winterWX*

**physics**

7.A turntable reaches an angular speed of 33.3 rpm, in 2.1 s, starting from rest. (a) Assuming the angular acceleration is constant, what is its magnitude? b How many revolutions does the turntable make during this time interval?
*Tuesday, February 22, 2011 at 8:55am by jimmyjonas*

**science , physics**

A person is riding a bicycle, and its wheels have an angular velocity of +15.5 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 +15.5 revolutions. (a) How much time does it take for the ...
*Wednesday, November 3, 2010 at 10:11pm by Anonymous*

**physics(URGENT!!!!!)**

alpha is my code for d^2T/dt^2, angular acceleration and dT/dt is omega, angular velocity
*Monday, December 9, 2013 at 3:08am by Damon*

**Physics**

During a tennis serve, a racket is given an angular acceleration of magnitude 155 rad/s2. At the top of the serve, the racket has an angular speed of 13 rad/s. If the distance between the top of the racket and the shoulder is 1.5 m, find the magnitude of the total acceleration...
*Wednesday, March 26, 2008 at 6:06pm by Zach*

**College Physics**

A turntable reaches an angular speed of 33.3 rpm, in 2.0 s, starting from rest. (a) Assuming the angular acceleration is constant, what is its magnitude? (b) How many revolutions does the turntable make during this time interval?
*Friday, September 25, 2009 at 5:28pm by Megan*

**physics**

pulsar is a rapidly rotating neutron star that emits radio pulses with precise synchronization, there being one such pulse for each rotation of the star. The period of rotation is found by measuring the time between pulses. At present, the pulsar in the central region of the ...
*Monday, March 17, 2008 at 3:13pm by shelby*

**Physics**

torque = I(moment of inertia) times angular acceleration(change in angular velocity over time) change in angular velocity over time simply put is velocity final - velocity intial divided by total time that's all im doing for you,you should get it form that
*Wednesday, April 25, 2012 at 2:06am by visoth*

**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**

The centripetal acceleration r w^2 is proportional to radius. w is the angular velocity (rad/sec), which is the same for both points. There is no tangential acceleration at constant w.
*Tuesday, April 13, 2010 at 3:40am by drwls*

**Physics**

the tangential linear acceleration of the child. = g = 9.81m/s^2 instantaneous angular acceleration of the see-saw = a/r = 9.81/1.91 = 5.14rad/s^2
*Monday, October 31, 2011 at 5:31pm by Matthias Schwartzkopf*

**Physics(Please check)**

This is how the solution is reached: Centripital acceleration = radius x (angular speed)^2 The acceleration of A = 2.8 (the acceleration of B) So to set it up we get: Sqrt(L2^2+L1^2) w^2 = 2.8 (L1) w^2 The angular velocities cancel because they are equal. Now square both sides...
*Tuesday, June 5, 2012 at 5:07pm by RJ*

**physics**

Since the velocities of the rims are equal at the point of contact, the angular velocities are inversely proportional to the radii. The same applies to the angular acceleration rates. use that fact to answer the questions yourself
*Tuesday, October 19, 2010 at 10:25am by drwls *

**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**

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**

Start with the tension. T= mg-ma Then the moment of inertia... Torque=I *angular acceleration Force*radius= I * linear acceleration/rad solve for I.
*Monday, March 24, 2008 at 4:18pm by bobpursley*

**Physics**

a = angular acceleration w = a t = angular velocity theta = (1/2) a t^2 = radians turned total from rest in this case thetas = 2pi * 4 = 8 pi radians so (1/2) a t^2 = 8 pi you know a, get t and then w
*Wednesday, January 27, 2010 at 6:09pm by Damon*

**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*

**rotations**

a = angular acceleration I = rotational inertia w = angular velocity v = linear velocity Torque = RxFT = Ia so, a = RxFT/I = (R/I)(4t-0.10t^2) w = integral(a) with respect to t v= wR
*Wednesday, March 10, 2010 at 8:34pm by FredR*

**Physics**

Two identical dragsters, starting from rest, accelerate side by side along a straight track. The wheels have identical angular acceleration. The wheels on one of the cars roll without slipping, while the wheels on the other slip during part of the time...
*Saturday, April 5, 2008 at 3:35am by James*

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