Sunday

April 20, 2014

April 20, 2014

Number of results: 110,261

**PhYsIcS - RoTaTiOnAl MoTiOn**

Oh, so you just convert the rotational motion into linear motion that can be used in a kinematic equation! Now I get it! Thanks!
*Sunday, December 7, 2008 at 10:22pm by Robert*

**physics**

What kind of motion does a constant, non zero torgue produce on an object mounted on an axle: choices constant rotational speed, constant rotational acceleration, increasing rotational acceleration or decreasing rotational acceleration.
*Sunday, June 20, 2010 at 9:14pm by mike*

**PHYSICS(HELP)**

Prob # 7 ocw.mit.edu/courses/physics/8-01sc-physics-i-classical-mechanics-fall-2010/two-dimensional-rotational-motion/two-dimensional-rotational-dynamics/MIT8_01SC_problems21_soln.pdf
*Monday, November 11, 2013 at 10:19am by Elena*

**physics**

http://www.physics247.com/physics-homework-help/rotational-motion.php
*Monday, October 6, 2008 at 12:59pm by bobpursley*

**physics**

Bob.. How can I find problems about Rotational motion/Angular motion? at least 15 problems only.. Can you help me with these?
*Monday, October 6, 2008 at 12:59pm by Akitsuke*

**Physics Classical Mechanics`**

http://ocw.mit.edu/courses/physics/8-01sc-physics-i-classical-mechanics-fall-2010/two-dimensional-rotational-motion/two-dimensional-rotational-dynamics/MIT8_01SC_problems21_soln.pdf
*Thursday, November 14, 2013 at 9:21am by Elena*

**Physics: Rotational Motion**

I think you can do (1/2) m v^2 and (1/2) I w^2
*Thursday, October 18, 2012 at 11:48am by Damon*

**physics**

I just need the explanation about all the topics you've mentioned early because I'm going to put that on my term paper... can you give me a site, then a list of 15 problems about the topic Rotational motion/Angular motion.. thanks
*Monday, October 6, 2008 at 12:24pm by Akitsuke*

**Physics - Rotational Motion**

a circle could be a hoop,or a thin wheel.
*Sunday, December 7, 2008 at 9:46pm by bobpursley*

**Physics - Rotational Motion**

Whichever one is the easiest to analyze.
*Sunday, December 7, 2008 at 9:46pm by Robert*

**Physics**

But bowling balls roll. If there were truly no friction between track and ball, the hypothesis that the translational kinetic energy remains constant and the angular velocity remains zero could be true, but we all know the ball starts rolling. The rolling means first that a ...
*Sunday, April 18, 2010 at 5:18am by Damon*

**physics**

can anyone give me a site that "best explains" about Rotational motion/Angular. thanks a lot.. :)
*Monday, October 6, 2008 at 12:24pm by Akitsuke*

**Physics - Rotational Motion**

The 2d drawing that goes with #2 shows a circle at the top of an incline. \
*Sunday, December 7, 2008 at 9:46pm by Robert*

**Physics - Rotational Motion**

(#1.) A top starting from 40 rad/s takes 200 rad to stop. What is its rotational acceleration? (a constant) (#2.) A stationary 100 Kg circular object (r= 0.20 m) is on a 35 degree incline. The coefficient of rolling friction between the block and the incline is 0.01. If it ...
*Sunday, December 7, 2008 at 8:45pm by Robert*

**Physics**

The gravitational energy available per mass is the same for both, but with the (solid) ball, a smaller share of the total energy is converted to rotational KE, leaving more for translational motion (velocity). Therefore the ball goes more rapidly down the ramp. Here is how to ...
*Friday, December 19, 2008 at 2:18pm by drwls*

**Physics**

A diver jumps off a dving board and does a twisting manuever. In the midst of his jump in the air, the diver cannot change his a. Rotational Energy b. Rotational Speed c. Rotational Inertia d. Angular momentum I say d just want to make sure
*Tuesday, April 28, 2009 at 1:01pm by David*

**Physics (Rotational Kinetic Energy)**

KE=1/2mv^2 + 1/2 *2/3 mr^2*w^2 but v=rw so w^2=v^2/r^2 KE=1/2mv^2+1/3 mv^2 = 5/6mv^2 what fraction is rotational? 1/3/(5/6)=2/5 or .4 is rotational check my math.
*Wednesday, October 21, 2009 at 9:29pm by bobpursley*

**physics**

A trapeze artist sailing through the air rotates with a rotational speed of 0.9·rev/s. If she contracts to reduce her rotational inertia to one sixth of what it was, what will her new rotational speed be? _____ rev/s? Can she completely stop her rotation while still airborne? ...
*Wednesday, February 6, 2013 at 6:25pm by wally*

**Physics - Rotational Motion**

Yes on 1. On 2, I dont know what a circular object is (sphere, cylinder, hoop). Each of those has a differing moment of inertial, and absorbs rolling friction differently.
*Sunday, December 7, 2008 at 9:46pm by bobpursley*

**Physics - Rotational Motion**

(#1.) A top starting from 40 rad/s takes 200 rad to stop. What is its rotational acceleration? (a constant) (#2.) A stationary 100 Kg circular object (r= 0.20 m) is on a 35 degree incline. The coefficient of rolling friction between the block and the incline is 0.01. If it ...
*Sunday, December 7, 2008 at 9:46pm by Robert*

**Physics**

A billiard ball moving at 5.80 m/s strikes a stationary ball of the same mass. After the collision, the first ball moves at 4.81 m/s at an angle of 34.0° with respect to the original line of motion. Assuming an elastic collision (and ignoring friction and rotational motion), ...
*Monday, March 14, 2011 at 2:08pm by John*

**Physics**

A billiard ball moving at 5.80 m/s strikes a stationary ball of the same mass. After the collision, the first ball moves at 4.81 m/s at an angle of 34.0° with respect to the original line of motion. Assuming an elastic collision (and ignoring friction and rotational motion), ...
*Monday, March 14, 2011 at 3:21pm by John*

**physics**

A cue ball initially moving at 2.6 m/s strikes a stationary eight ball of the same size and mass. After the collision, the cue ball’s ﬁnal speed is 1.3 m/s.Find the cue ball’s angle θ with respect to its original line of motion. Consider this to be an elastic ...
*Sunday, February 9, 2014 at 5:41pm by Anonymous*

**Physics**

Rotational Inertia- Particle 1: m=50g x=2 cm y=2 cm P 2: m=25 x=0 y=4 P 3: m=25 x=-3 y=-3 P 4: m=30 x=-e y=4 The question says to find the rotational inertia of the collection about the x, y, and 7 axis in g/cm^2, then suppose the x axis rotational inertia is A and the y axis ...
*Tuesday, July 27, 2010 at 8:46pm by Mark*

**PhYsIcS - RoTaTiOnAl MoTiOn**

I know you use deltaTheta = 1/2(wi + wf)deltaT, but I don't know how to solve for the wf or t of the mud (the final velocity or the time it's in the air)
*Sunday, December 7, 2008 at 10:22pm by Robert*

**PHYSICS(ELENA**

did this work for you? are you sure that we shouldn't use parallel axis theorem to find I? Because rod is rotating about end. And you assume that it's a point mass in the rotational motion.
*Sunday, December 8, 2013 at 4:29pm by C_P*

**Physics**

Hello, I am doing a physics experiment regarding rotational motion and equilibrium. We have the following lab setup and are supposed to find the unknown mass. How should I approach this? file:///C:/Users/Rahul/Desktop/Lab%20Drawing.jpg
*Wednesday, February 9, 2011 at 6:18pm by Rahul*

**college physics**

A cue ball initially moving at 4.3m/s strikes a stationary eight ball of the same size and mass. After the collision, the cue ball’s final speed is 2.3 m/s at angle 1 with respect to it's original line of motion. The 8 ball moves with unknown speed at an angle 2 unknown with ...
*Thursday, March 10, 2011 at 3:28pm by sarah*

**physics**

If the angular quantities θ,ω,α were specified in terms of degrees rather than radians, how would the kinematics equations for uniformly accelerated rotational motion have to be altered?
*Sunday, April 11, 2010 at 10:48am by Charlie*

**physics**

In designing rotating space stations to provide for artificial-gravity environments, one of the constraints that must be considered is motion sickness. Studies have shown that the negative effects of motion sickness begin to appear when the rotational motion is faster than ...
*Sunday, December 19, 2010 at 10:35pm by jessica*

**physics**

In designing rotating space stations to provide for artificial-gravity environments, one of the constraints that must be considered is motion sickness. Studies have shown that the negative effects of motion sickness begin to appear when the rotational motion is faster than ...
*Wednesday, November 7, 2012 at 2:17pm by Anonymous*

**PHYSICS (please help)**

Remember KE consists of rotational, and translation, and translational speed is related to rotational. V=wr/2PI
*Wednesday, October 31, 2012 at 12:21pm by bobpursley*

**College Physics**

In designing rotating space stations to provide for artificial-gravity environments, one of the constraints that must be considered is motion sickness. Studies have shown that the negative effects of motion sickness begin to appear when the rotational motion is faster than ...
*Saturday, October 2, 2010 at 2:09pm by Dawn*

**Rotational Motion Physics Problem**

A car starts from rest on a curve with a radius of 150 and accelerates at 1.2.Through what angle will the car have traveled when the magnitude of its total acceleration is 2.2 ?
*Wednesday, October 3, 2012 at 6:54pm by Amar*

**Physics**

What equation is the rotational equilvalent of newton's law ? give the meaning of each symbol and state which rotational quantites are analogous to which linear quantities.
*Thursday, October 13, 2011 at 1:00am by leslie*

**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 High School Rotational Motion**

A wheel has a radius of 2.2 m. How far (path length) does a point on the circumference travel if the wheel is rotated through an angle of 190 rad? Answer in units of m
*Thursday, February 2, 2012 at 12:46am by Ama*

**physics**

determine the kinetic energy of falling by an average of one degree of freedom of the nitrogen molecule at temperature T = 1000 K, as well as the kinetic energy of rotational motion.
*Monday, March 28, 2011 at 8:46pm by lisa*

**physics**

If a particle were to move from position A to position b in 0.5s, what would be its rotational (angular) velocity? If the motion is uniform (constant speed), what would be its magnitude of the acceleration?
*Sunday, February 12, 2012 at 10:09pm by Anonymous*

**physics**

V (at the bottom) = sqrt(2gH) if h is the height of the hill. If the ball rolled down, as most balls do, the velocity would be a bit less. But that is another story. Some energy would go into rotational motion.
*Friday, March 12, 2010 at 1:41pm by drwls*

**Physics**

A wheel has a coonstant rotational acceleration of 3.0 rad/s^2. During a certain 4.0 s interval, it turns through an angle of 120 rad. Assuming that the wheel starts from rest, how long is it in motion at the start of the 4s interval. I just need help in getting started. I ...
*Monday, December 4, 2006 at 10:42am by laura*

**physics**

A heavy flywheel rotating on its central axis is slowing down because of friction on its bearings. At the end of the first minute of slowing, its rotational speed is 0.90 of its intial rotational speed of 250 rev/min. Assuming a constant rotational acceleration, find its ...
*Monday, December 4, 2006 at 10:45am by laura*

**Physics**

Set the rotational kinetic energy equal to 3.39*10^9 Joules, and solve for the angular velocity, w. The rotational KE is (1/2)*I*w^2 The moment of inertia of a solid disc about the center is I = (1/2)MR^2
*Saturday, November 3, 2012 at 11:17pm by drwls*

**Physics**

"Uniform motion" is motion along a straight line with no increase in speed. The velocity is constant in uniform motion. In uniformaly accelerated motion, there is a constant acceleration is a certain fixed direction. A falling object would be an example. The displacement from ...
*Thursday, February 11, 2010 at 10:29pm by drwls*

**Physics - Rotational Motion**

A ball of mass 5.3 kg and radius 8 cm rolls without slipping horizontally at 4.3 m/s and hits a spring attached to a wall. What is the maximum change in length of the spring if the spring constant k=41100N/m? (Assume the floor is frictionless)
*Thursday, November 17, 2011 at 7:16pm by Jim*

**physics**

What do you mean by "the kinetic energy of falling" ? "Falling by one degree of freedom" makes no sense. Make sure you copied the problem correctly. There are three degrees of freedom of translational motion because space has three dimensions. Any atom or molecule has kT/2 ...
*Monday, March 28, 2011 at 8:46pm by drwls*

**physics**

Kinematic of rotational motion gives 2•π•N=ε•t^2/2 ω= ε•t. Therefore, ε = ω^2/4•N. The moment of inertia (disc) I = m•R^2/2. M =I• ε
*Saturday, March 17, 2012 at 7:44pm by Elena*

**Physics**

The equation of motion for an oscillator in vertical SHM is given by y=(0.60m)sin[(130rad/s)t]. Part A What is the amplitude of this motion? Part B What is the frequency of this motion? Part C What is the period of this motion?
*Tuesday, December 10, 2013 at 1:48pm by Becca*

**general physics/rotational motion**

Two crates of mass m1 = 16 kg and m2 = 23 kg are connected by a cable that is strung over a pulley of mass mpulley = 22 kg as shown below. There is no friction between crate 1 and the table. m1 is sitting on the table mpulley is at the edge of the table to the right of m1 m2 ...
*Monday, November 2, 2009 at 2:21pm by kulvinder*

**Physics Please check my answers**

It's possible for a body to have both rotational and translational motion at the same time. True. << False. 2. The moment of inertia of an object would be different on the surface of the earth than on the surface of the moon. True. << False. 3. The moment of ...
*Monday, February 3, 2014 at 1:01pm by Chelsea*

**Physics**

The have the same initial PE. So since inertia is the thing that resists motion, you have to consider rotational motion. Find the velocity of each at the bottom, if the velocities are different, then they do not reach the bottom at the same time. Cylinder: mgh=1/2 m vf^2+1/2 I...
*Tuesday, December 13, 2011 at 8:54pm by bobpursley*

**physics - rotational motion**

A small car of mass, m, is release at height, h, on a steel track. the car rolls down the track and through the loop of radius, R. at the end of the rack, the car rolls off the track, which is positioned at height, H, above the floor. neglect friction and the small amount of ...
*Friday, April 22, 2011 at 2:50pm by Lauren*

**physics**

What is it you are failing to understand. Your subject listed is broad. angular motion angular momentum moments of inertia translation parallel axis theorem conservation of momentum conservation of energy coordinate systems, rotational
*Monday, October 6, 2008 at 12:24pm by bobpursley*

**Physics High School Rotational Motion**

Distance S = R*(theta) Use that formula to compute the distance yourself. "theta" is the angle in radians, which you have been given. The wheel obviously makes many revolutions. 190/(2 pi) = 30.239 revolution.
*Thursday, February 2, 2012 at 12:46am by drwls*

**Physics**

It consists of two parts: (a) The translational KE, (1/2) M V^2, which is due to the motion of the center of mass at velocity V = 3.55 m/s, and (b) The rotational KE, (1/2)*I*w^2 where w is the angular velocity, V/R, and I is the moment of inertia, which for a solid sphere is...
*Saturday, June 9, 2012 at 5:18pm by drwls*

**Physics**

A wheel with radius R, mass m, and rotational inertia I rolls without slipping across the ground. If its translational kinetic energy is E, what is its rotational kinetic energy?
*Saturday, March 19, 2011 at 4:36pm by John*

**physics**

The total KE is 7/10 M V^2. The rotational part is 1/5 M V^2, and the translational part is 1/2 MV^2. Get the rotational KE from the moment of inertia (2/5)MR^2, KErot = (1/2) I w^2, and V = R w
*Thursday, March 25, 2010 at 11:00pm by drwls*

**Classical Mechanics Physics**

you can work omega out of conservation of momentum. then get rotational KE using that omega. then the energy loss should be initial KE_hammer - rotational KE
*Friday, December 6, 2013 at 3:39pm by Anonymous*

**physics**

I suspect your teacher did not realize what he wrote: commpletely elastic, and transfers all of its momentum.... Rotational energy, and rotational momentum being conserved is an issue here, I think. Nothing on the size of either ball is given...so my guess is your teacher ...
*Wednesday, October 17, 2012 at 2:17pm by bobpursley*

**physics**

Consider the rotational motion of two compact discs (CD). Disc A undergoes a rotation of 540 degrees in 1.50 secs, and disc B undergoes a rotation of π radians in 3.00 secs.
*Monday, April 7, 2014 at 11:30pm by Anonymous*

**physics**

For which of the following motions of an object must the acceleration always be zero? I. Any motion in a straight line II. Any free fall motion III. Any motion in a circle it can be more than one :P
*Tuesday, February 4, 2014 at 11:28pm by ashley*

**physics**

What is the rotational kinetic energy of a planet about its spin axis? Model the planet as a uniform sphere of radius 6000 km, and mass 6.21 x 10^24 kg. Assume it has a rotational period of 24.0 h.
*Saturday, April 20, 2013 at 7:43am by Anonymous*

**PhYsIcS - RoTaTiOnAl MoTiOn**

A tire (0.8 m diameter) starts at rest and has an angular acceleration of 5 rad/s^2. If it moves for 10 seconds and then stops abruptly causing a blob of mud at the top of the tire to fly off, how far along the ground will the blob travel until it hits the ground?
*Sunday, December 7, 2008 at 10:22pm by Robert*

**Physics**

A charged particle is projected into a uniform B-field. Its velocity vector is perpendicular to the B-field vector. What type of path will the particle travel? Neglect gravity. Answer straight line motion elliptical motion parabolic motion circular motion
*Tuesday, July 16, 2013 at 2:14pm by tom*

**physics**

Consider a 8·kg rod with a length of 0.6·m and rotating about an axis passing through its center. (a) What is its rotational inertia? (B) Suppose the rod is rotating counterclockwise and speeding up with a rotational acceleration of 7·rad/s2. What is the net torque acting on ...
*Wednesday, November 2, 2011 at 10:40am by jen*

**Physics**

A merry-go-round in the park has a radius of 1.8 m and a rotational inertia of 900 kgm^2. A child pushes the merry-go-round with a constant force of 80 N applied at the edge and parallel to the edge. A frictional torque of 12 Nm acts at the axle of the merry-go-round. a. What ...
*Wednesday, January 20, 2010 at 8:13pm by Bell*

**physics**

for part b, your final KE is rotational KE which is now 1/2 I w^2 where I consists of the rod mass distributed, and the mass of the initial stuff at some rotational distance. You cant get the same answer as a), as the units are different. THe units in a) are sec^-1, and in b) ...
*Monday, April 6, 2009 at 11:36am by bobpursley*

**PhYsIcS - RoTaTiOnAl MoTiOn**

The tire's angular velocity when the mud flies off is Wf = 50 rad/s. Multiply that by the radius R for the horizontal velocity The mud blob falls verically 0.8 m since it starts at the top of the tire. Use that fact to compute how long it takes to fall to the ground and how ...
*Sunday, December 7, 2008 at 10:22pm by drwls*

**physics**

The thing that stays constant here is the angular momentum which is angular velocity (omega) times rotational inertia (I) so write: angular velocity before times rotational inertia before equals angular velocity after times rotational inertia after. By the way angular velocity...
*Tuesday, December 4, 2007 at 12:17pm by Damon*

**rotational motion physics**

A 3.7 m diameter merry-go-round is rotating freely with an angular velocity of 0.63 rad/s. Its total moment of inertia is 1600 kg\cdot m^2. Four people standing on the ground, each of mass 70 kg, suddenly step onto the edge of the merry-go-round.
*Saturday, November 19, 2011 at 12:20am by David colon*

**Physics**

r = .19 meter I = (1/2) m r^2 is moment of inertia of disk I = (1/2)(45)(.19)^2 That is the rotational moment of inertia, I suspect what you want. If you really want the rotational inertia you must multiply that by omega, the angular velocity in radians per second.
*Sunday, November 13, 2011 at 3:54pm by Damon*

**science**

I just wish that people could post a helpful answer, Translational motion is movement of an object without a change in its orientation relative to a fixed point, as opposed to rotational motion, in which the object is turning about an axis. With that in mind a leaf blowing ...
*Thursday, November 29, 2012 at 11:01am by Allie*

**Physics**

create a graph with your data of rotational speed vs radius. independent variable goes on x axis. which is x axis and which is y axis out of radius and rotational speed
*Monday, January 31, 2011 at 7:15pm by Jo*

**Motion**

Can sumone explain wot linear motion is? Wot's the opposite of linear motion? THX Linear motion is motion is a constant direction, i.e., along a straight line. The speed may change but the direction may not. Motion that is not linear is called curvilinear.
*Saturday, June 25, 2005 at 6:57am by Mike*

**Physics- drwls please help**

(a) Calculate the kinetic energy that the earth has because of its rotation about its own axis. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United States in one year is about 9.33 109 J. (...
*Wednesday, March 28, 2007 at 6:52pm by Jim*

**Physics help!**

Suppose a revolving door at the bamk is spinning around once every 5 seconds. As you walk through, you push on the door for 2 seconds, which increases the rotational speed so that it rotates once a second. What was the rotational acceleration due to your push?
*Thursday, December 13, 2012 at 6:19pm by Anonymous*

**physics**

The total kinetic energy is the sum of Translational KE = (1/2)MV^2 = 39.5 V^2, and Rotational KE = 2*(1/2)*I*w^2 = I*V^2/R^2 = 0.978 V^2 I is the moment of inertia of a single wheel. The fraction of the energy that is rotational is 0.978V^2/(0.978+39.5)V^2 = 0.0243 Note that ...
*Tuesday, July 10, 2012 at 5:23pm by drwls*

**Physics PLEASE HELP!**

Suppose a revolving door at the bamk is spinning around once every 5 seconds. As you walk through, you push on the door for 2 seconds, which increases the rotational speed so that it rotates once a second. What was the rotational acceleration due to your push?
*Thursday, December 13, 2012 at 6:31pm by Anonymous*

**PHYSICS PLEASEEEE HELP ME**

Suppose a revolving door at the bank is spinning around once every 5 seconds. As you walk through, you push on the door for 2 seconds, which increases that rotational speed so that it rotates once a second. What was the Rotational acceleration due to your push?
*Monday, December 17, 2012 at 6:31pm by Anonymous*

**Physics**

Answer for a is that the path will be linear, meaning that the person will see it as a 'vertical" motion.. However, for b, the answer is that the observer will see the object motion as a parabolic or projectile motion... Hope it helps.
*Sunday, October 18, 2009 at 4:54pm by Andre*

**physics**

A uniform disk with a mass of 800 g and radius 17.0 cm is rotating on frictionless bearings with an rotational speed of 18.0 Hz when Jill drops a 130 g clod of clay on a point 7.10 cm from the center of the disk, where it sticks. What is the new rotational speed of the disk?
*Tuesday, December 4, 2007 at 12:16pm by stephanie*

**physics**

Use conservation of energy, and make sure you include both the translational energy (1/2) M V^2 (due to linear motion of the center of mass), and the rotational kinetic energy (1/2) I w^2 = (1/2)I(V/R)^2. The sphere will go down the ramp faster because less of the energy gets ...
*Saturday, November 21, 2009 at 9:12am by drwls*

**Physics**

Since it is rolling you must consider both the kinetic energy of both translation (forward motion) and rotation. The rotational kinetic energy is (1/2) I w^2 where I = (2/5) M R^2 for a solid sphere, and w = V/R is the angular velocity. Put it all together and you find that ...
*Thursday, April 29, 2010 at 2:52pm by drwls*

**physics - uniform circular motion**

Explain why the kinematics equations which describe the motion of the object that has constant acceleration cannot be applied to uniform circular motion.
*Monday, August 23, 2010 at 10:16am by Shaila*

**Physics**

A disk lying on the XY plane rinitially roates counter-clockwise with a rotational speed of w0. After a time interval rt, the rotational speed has changed to wf moving in the clockwise direction. The average torque during this time interval is which of the following?
*Saturday, March 19, 2011 at 4:30pm by John*

**physics**

A solid cylinder rolls faster, because a smaller fraction of the available potential energy gets converted to rotational kinetic energy. That leaves more energy available for forward motion. This is true even if the masses and radii are different. For a solid cylinder that has...
*Thursday, February 9, 2012 at 6:05am by drwls*

**physics**

Find the rotational kinetic energy of the earth about the sun due to its orbit about the sun. The mass of the earth M is 6 x 1024 kg, the orbital radius r is 1.5 x 1011 m and the rotational period T is 1 year. Treat the earth as a point mass in this problem.
*Friday, December 3, 2010 at 4:00pm by Qay*

**physics**

Find the rotational kinetic energy of the earth about the sun due to its orbit about the sun. The mass of the earth M is 6 x 1024 kg, the orbital radius r is 1.5 x 1011 m and the rotational period T is 1 year. Treat the earth as a point mass in this problem
*Saturday, December 4, 2010 at 8:48am by Maa*

**Physics**

it says create a graph from our data. rotational speed vs force. i know that independent variable goes on the x axis. but out of rotational speed and force which goes on the x axis and which goes on the y?
*Monday, January 31, 2011 at 7:14pm by JuJu*

**Physics**

it says create a graph from our data. rotational speed vs force. i know that independent variable goes on the x axis. but out of rotational speed and force which goes on the x axis and which goes on the y?
*Monday, January 31, 2011 at 7:14pm by JuJu*

**physics**

since car and lorry wheel has same speed so kinetic energy of car = rotational energy of lorry wheel 1/2mv^2= 1/2mw^2r^2 v= r w where w= rotational velocity r= v/w=13.2/41.8=0.31 m= 31.5 cm
*Sunday, November 27, 2011 at 3:05am by tarun gehlot*

**Physics-units required**

The potential energy of the ball falling from the no-slip side will be converted into two kinetic energies, one of linear motion, given by (1/2)mv², and the other of rotational velocity of the ball, given by (1/2)Iω². Note that the axis of rotation is about the...
*Tuesday, November 23, 2010 at 2:52pm by MathMate*

**Physics**

A lawn mower has a flat, rod-shaped steel blade that rotates about its center. The mass of the blade is 0.65kg and its length is 0.55m. What is the rotational energy of the blade at its operating angular speed of 3450 rpm? If all of the rotational kinetic energy of the blade ...
*Sunday, October 23, 2011 at 8:32pm by Jc*

**physics**

In each case, add the translational kinetic energy, (M/2)V^2, to the rotational kinetic energy, (I/2)w^2. I is the moment of intertia about the center of mass and w is the angular velocity. (1a) (M/2)V^2 = (1/2)*0.050*(0.1)^2 = 2.5*10^-4 J (I/2)w^2 = (1/2)(2/5)M*R^2*(V/R)^2...
*Saturday, May 26, 2012 at 6:04am by drwls*

**physics - rotational motion**

a) KE at bottom= PE at top 1/2 m v^2=mgh solve for v. where h is the distance from the starting point to the end point. b) 1/2 m v^2=mg(h-2R) c) at the top of the loop. v^2/r=g as a minimum, so figure v^2.Then, using that v^2, 1/2 mv^2=mg(heighttostart) I dont understand the ...
*Friday, April 22, 2011 at 2:50pm by bobpursley*

**Astronomy **

Retrograde motion describe the A backward motion of the stars relative to Earth B uniform circular motion exhibited by the planets C irregular speeds at which the planet travel. D backward motion of the planets with respect to the stars I think the answer is A But my book ...
*Sunday, March 28, 2010 at 6:34pm by B*

**Physics**

An ice skater, has a rotational inertia of I = 4 kg m2, and spins at 2 rad/sec. She then changes her rotational inertia to 2 kg m2. What is her final angular velocity? a. 4 rad/s b. 2 rad/s c. 2.8 rad/s d. 8 rad/s The answer must be A then right.
*Thursday, April 30, 2009 at 3:08pm by David*

**physics**

it's still the same when you say Angular motion to Circular motion?
*Monday, October 6, 2008 at 12:59pm by Akitsuke*

**physics**

Answer: B. 1.0s later, since the vertical motion is not affected by the horizontal motion
*Tuesday, January 25, 2011 at 11:49pm by B*

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