Saturday

April 19, 2014

April 19, 2014

Number of results: 109,411

**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(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*

**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**

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**

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 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 (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*

**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**

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-Mechanics**

horizontal surface. The block is connected by a cord passing over a pulley to another block of mass 5.53 kg which hangs in the air, as shown on the following picture. Assume the cord to be light (massless and weightless) and unstretchable and the pulley to have no friction and...
*Wednesday, September 22, 2010 at 8:22pm by Genevieve*

**Physics C: Mechanics**

A yo-yo has a rotational inertia of 760 g·cm2 and a mass of 200 g. Its axle radius is 4.0 mm, and its string is 100 cm long. The yo-yo rolls from rest down to the end of the string. (a) What is the magnitude of its linear acceleration? cm/s2 (b) How long does it take to reach ...
*Tuesday, October 26, 2010 at 7:33pm by Xavier Hernandez*

**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 Classical Mechanics**

Pr/3 cw.mit.edu/courses/physics/8-01sc-physics-i-classical-mechanics-fall-2010/momentum/momentum-and-impulse/MIT8_01SC_problems16_soln.pdf
*Monday, October 28, 2013 at 6:09am by Elena*

**Physics**

Did Einstein support quantum mechanics as being fundamental physics, or did he think quantum mechanics was inconclusive?
*Thursday, April 10, 2008 at 11:58pm by Tammy*

**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*

**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 Classical Mechanics**

[h][t][t][p]://[ocw].[mit].[edu]/courses/physics/8-01sc-physics-i-classical-mechanics-fall-2010/rotation-and-translation/two-dimensional-rotation-and-translation-dynamics/MIT8_01SC_coursenotes27.pdf PGS 13-17
*Thursday, November 14, 2013 at 7:05am by Anonymous*

**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**

If the electron in a hydrogen atom obeyed classical mechanics instead of quantum mechanics, would it emit a continuous spectrum or a line spectrum?
*Thursday, April 10, 2008 at 8:59pm by Kara*

**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**

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**

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**

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*

**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*

**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*

**Physics Classical Mechanics**

Problem 7.9 http://ocw.mit.edu/courses/physics/8-01-physics-i-classical-mechanics-fall-1999/assignments/sol7.pdf
*Thursday, November 7, 2013 at 1:59pm by Elena*

**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**

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 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*

**Classical Mechanics - Need Help Please**

@fima, Have you submited that deltaE value? I thought it had to take in account Kinect Rotational Energy of the Merry-go-round... But the energy loss is about the same (974.234 without it, 951.129 considering it.) Just wanting to confirm.
*Sunday, December 8, 2013 at 3:38am by Anoninho*

**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**

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**

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*

**mechanics**

Find the total kinetic energy of a 1500 g wheel, 700 mm in diameter, rolling across a level surface at 650 rpm. Assume that the wheel can be considered as a hoop. (b) For the wheel in part (a), calculate the torque required to decrease its rotational speed from 400 rpm to rest...
*Tuesday, May 14, 2013 at 1:15pm by george*

**rotational mechanics**

a thin rod of length 2R and mass M is standing vertically on a perfectly smooth floor. the state of equilibrium in which the rod at rest is unstable and the rod falls. FInd the trajectories that the various points of rod describe and velocity with which the upper end of rod ...
*Wednesday, March 31, 2010 at 11:46am by pramod*

**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 Classical Mechanics**

Pr 4 http://ocw.mit.edu/courses/physics/8-01sc-physics-i-classical-mechanics-fall-2010/momentum/momentum-and-impulse/MIT8_01SC_problems16_soln.pdf
*Monday, October 28, 2013 at 6:11am by Elena*

**physics**

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

**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**

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 I say B, am i right?
*Thursday, April 30, 2009 at 11:19am by David*

**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**

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**

Many laws of physics turn out to be not quite right, r perfectly accurate, when experiments of higher accuracy are performed. Newton's "Laws" of gravity and mechanics turned out to be not quite right when Einstein discovered relativity. The conservation of energy "law" can be ...
*Sunday, October 2, 2011 at 10:35pm by drwls*

**Physics**

To reduce its rotational inertia, an engineer proposes drilling three holes in a large wheel of radius R. The holes are to be centered midway between the center and edge of the wheel. What should be their radii (in terms of R) if drilling the holes is to reduce the rotational ...
*Friday, November 2, 2012 at 6:29pm by John*

**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 Urgent please help**

A figure skater stands on one spot on the ice(assumed frictionless) and spins around with her arms extended. When she pulls in her arms, her moment of inertia decreases to 3/4 of the initial value. Assume that her spin angular momentum is conserved. What is the ratio of her ...
*Monday, November 11, 2013 at 11:22pm by rosa*

**Physics**

An ice skater, hasa rotational inertia of I = 4 kg m2, and spins at 2 rad/sec. Her rotational inertia then undergoes a change to 2 kg m2. Which of the following is true? a. Her angular momentum remains the same b. Her angular velocity increases c. Her kinetic energy increases ...
*Thursday, April 30, 2009 at 11:20am by David*

**Physics**

A mass of 1.0 kg is located at the end of a very light and rigid rod 44 cm in length. The rod is rotating about an axis at its opposite end with a rotational velocity of 3 rad/s. (a) What is the rotational inertia of the system? kg · m2 (b) What is the angular momentum of the ...
*Friday, April 6, 2012 at 1:10am by Jermaine*

**physics**

find the rotational kinetic energy of the earth about the sun due to its orbital about the sun. The mass of the each M is 6 X 10^24 kg, the orbital radius r is 1.5 X 10^11 m and the rotational period T is 1 year. Hint, treat the earth as a point mass in this problem.
*Friday, November 25, 2011 at 10:44am by pakilina*

**Physics**

Yes, a tire is a hoop. I= mr^2 rotatioinal energy= 1/2 I w^2=1/2 mr^2 (v/r)^2= 1/2 mv^2 You are right. Now, at the top, you did calculate the final KE right, however, the tire is still rotating. Final KE has two parts, translational, and rotational. To calculate v, I think you...
*Monday, October 26, 2009 at 1:45pm by bobpursley*

**mechanics/motion**

Can someone help me with mechanics. I need to check my answers
*Friday, January 31, 2014 at 12:20pm by Anonymous*

**science**

Classical mechanics Relativity Thermodynamics Electromagnetism/Optics Quantum mechanics
*Wednesday, August 29, 2007 at 8:17pm by ~christina~*

**physics**

An antique carousel that’s powered by a large electric motor undergoes constant angular acceleration from rest to full rotational speed in 6 seconds. When the ride ends, a brake causes it to decelerate steadily from full rotational speed to rest in 8.9 seconds. Compare the ...
*Wednesday, February 16, 2011 at 4:04pm by olivia*

**Physics**

A potter’s wheel with rotational inertia of 45 kg m2, is spinning freely at 40 rpm. The potter drops a lump of clay onto the wheel where it sticks a distance 1.2 m from the rotational axis at the wheel’s center. If the subsequent angular speed of the wheel is 32 rpm, what is ...
*Monday, June 29, 2009 at 8:14pm by Sarah*

**phys**

A disk rolls down a slope. It rotational axis is its center of mass. It is rotation at a constant angular speed making 34.0 full revolutions in a time interval of 3.30 s. 1)What is the rotational inertia of the disk if its mass is 11.7 kg, and its radius is 49.6 cm? A=1.44kmg^...
*Monday, December 7, 2009 at 12:38pm by ami*

**physics help 4 please!**

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 b.) What is the rotational KE of the disk? ? J c.) What is the total KE of the disk? ? J d.) The disk then rolls up a hill...
*Saturday, October 18, 2008 at 2:26am by kelsey*

**math**

any shape with 4 lines of symmetry and rotational order 2. A rectangle would fit that description. See http://www.icteachers.co.uk/children/sats/rotational.htm#Maths I hope this helps. Thanks for asking. i need some help on my maths and i am inbarresed to ask my teacher
*Sunday, September 17, 2006 at 9:27am by george*

**Physics**

translational=1/2 m v^2 rotational=1/2 I w^2 where w=v/r rotaltonal=1/2 I v^2/r but I for thin shell cylinder is http://en.wikipedia.org/wiki/List_of_moments_of_inertia rotational=1/2 mr^2*v^2/r^2=1/2 m v^2 Hmmm. Looks like 1/2 of the energy is translational.
*Sunday, July 8, 2012 at 6:20pm by bobpursley*

**math**

how can you determine whether a design has rotational symmetry? if a design has a rotational symmetry, how many can you find the angle of roation??
*Wednesday, February 20, 2008 at 8:09pm by KIRA*

**physics**

The uniform solid block in Fig. 11-36 has a mass of M = 5.60 kg and edge lengths a = 17.5 cm, b = 39.5 cm, and c = 2.85 cm. Calculate its rotational inertia about an axis through one corner and perpendicular to the large faces I know you have to find the center of mass to get ...
*Tuesday, January 18, 2011 at 7:35pm by almost there*

**physics**

A spinning flywheel has rotational inertia I = 402.9 kgm2. Its angular velocity decreases from 20.3 rad/s to zero in 266.6 s due to friction. What is the frictional torque acting? Torque= MomentofInertia*angularacceleration. You are given the moment of inertia (you named it ...
*Monday, October 23, 2006 at 7:06pm by Anonymous*

**physics**

Conside the ratios of kinetic energies of the two cylinders. Each rolls up the incline a distance that is proprtional K.E. The differences are due to differing amounts of rotational kinetic energy, which depends upon the moment of inertia. They are not the same for the two ...
*Sunday, April 3, 2011 at 1:52am by drwls*

**critical thinking**

Over time, non-specialists are usually able to assimilate radically new scientific ideas, even though these ideas may seem strange when they are initially introduced. Such was the case with Newtonian physics; when Newton proposed his ideas regarding motion and gravitation in ...
*Friday, January 16, 2009 at 11:01am by Anonymous*

**CRT205 Quiz**

Over time, non-specialists are usually able to assimilate radically new scientific ideas, even though these ideas may seem strange when they are initially introduced. Such was the case with Newtonian physics; when Newton proposed his ideas regarding motion and gravitation in ...
*Friday, February 27, 2009 at 1:45pm by randy*

**English**

Over time, non-specialists are usually able to assimilate radically new scientific ideas, even though these ideas may seem strange when they are initially introduced. Such was the case with Newtonian physics; when Newton proposed his ideas regarding motion and gravitation in ...
*Thursday, May 7, 2009 at 1:00pm by john browm*

**Critical Thinking**

Over time, non-specialists are usually able to assimilate radically new scientific ideas, even though these ideas may seem strange when they are initially introduced. Such was the case with Newtonian physics; when Newton proposed his ideas regarding motion and gravitation in ...
*Saturday, June 6, 2009 at 12:15pm by mary*

**Critical Thinking**

Over time, non-specialists are usually able to assimilate radically new scientific ideas, even though these ideas may seem strange when they are initially introduced. Such was the case with Newtonian physics; when Newton proposed his ideas regarding motion and gravitation in ...
*Friday, July 31, 2009 at 2:20am by bere*

**mechanics**

I disagree that it has anything to do with mechanics.
*Monday, December 9, 2013 at 4:26am by Steve*

**PHYSICS--SHM**

A pendulum consists of a uniform disk with radius r = 10 cm and mass 545 g attached to a uniform rod with length L = 500 mm and mass 300 g. (figure: one end of the rod attach to a pivot and the other end attach to the center of the disk) (a) Calculate the rotational inertia of...
*Saturday, January 27, 2007 at 9:12pm by wooh*

**physics**

The angular momentum does not change original rate of rotation times original rotational inertia = final rate of rotation times final rotational inertia
*Tuesday, December 4, 2007 at 12:17pm by Damon*

**physics**

A yo-yo has a rotational inertia of 810 g·cm2 and a mass of 95 g. Its axle radius is 2.6 mm and its string is 100 cm long. The yo-yo is thrown so that its its initial speed down the string is 1.0 m/s. (a) How long does the yo-yo take to reach the end of the string? s (b) As it...
*Sunday, January 23, 2011 at 11:20pm by Help Please!*

**PHYSICS 1**

When a pitcher throws a curve ball, the ball is given a fairly rapid spin. A 0.15 kg baseball with a radius of 3.7 cm is thrown with a linear speed of 41 m/s and an angular speed of 37 rad/s. Assume that the ball is a uniform, solid sphere. (b) Calculate how much of its ...
*Monday, October 20, 2008 at 4:28am by kelsey*

**Geometry**

How do the axes of rotational symmetry of an octahedron compare to the axes of rotational symmetry of a cube?
*Friday, February 19, 2010 at 10:00pm by Nicole*

**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*

**english: crit. thinking**

Over time, non-specialists are usually able to assimilate radically new scientific ideas, even though these ideas may seem strange when they are initially introduced. Such was the case with Newtonian physics; when Newton proposed his ideas regarding motion and gravitation in ...
*Wednesday, March 19, 2008 at 10:37pm by rose*

**physics**

Some special vehicles have spinning disks (flywheels) to store energy while they roll downhill. They use that stored energy to lift themselves uphill later on. Their flywheels have relatively small rotational masses but spin at enormous angular speeds. How would a flywheel’s ...
*Monday, February 21, 2011 at 3:31pm by olga*

**physics**

You can do this with Kepler's law, or with mechanics. With mechanics FIrst satellite gravity force=centripetal force. GMm/5.5E6^2= mv^2/5.5E6 solve for GM Next satellite, do the same thing, but you know GM, so solve for v
*Thursday, October 18, 2007 at 6:09pm by bobpursley*

**physics-rotational dynamics**

Two astronauts, each having a mass of 75.0 kg, are connected by a 10.0 m rope of negligible mass. THey are isolated in space,orbiting their center of mass at speeds of 5.00 m/s. calculate A)magnitude of the angular momentum of the system by treating astronauts as particles and...
*Monday, February 12, 2007 at 4:22pm by cyndi*

**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**

constant rotational acceleration
*Sunday, June 20, 2010 at 9:14pm by Anika*

**physics**

constant rotational acceleration
*Sunday, June 20, 2010 at 9:14pm by kl*

**geometry**

The question requires 4-fold rotational symmetry. In a fan with 4 blades, it exhibits 4-fold rotational symmetry. Each blade when turned 90° coincides with the next blade.
*Sunday, September 19, 2010 at 5:54pm by MathMate*

**Physics (Rotational Kinetic Energy)**

Hello, The question is: A solid ball rolls along the floor with a constant linear speed v. Find the fraction of its total kinetic energy that is in the form of rotational kinetic energy about the center of the ball. Krot/Ktotal = ? The answer I keep getting is 3/1, but the ...
*Wednesday, October 21, 2009 at 9:29pm by Ben*

**physics**

The rotational energy of each astronaut is 1/2 * I * omega^2 where I is the moment of inertia, and omega is the angular speed. The moment inertia of the astronaut is m*r^2 r = 12.0 / 2 = 6 m v = 5 m/s = omega*r The total rotational energy is 1/2 * I * omega^2 + 1/2 * I * omega...
*Sunday, November 11, 2012 at 7:48pm by Jennifer*

**Physics**

http://ocw.mit.edu/courses/physics/8-01-physics-i-classical-mechanics-fall-1999/video-lectures/lecture-6/
*Tuesday, November 29, 2011 at 8:01pm by Damon*

**physics**

http://ocw.mit.edu/courses/physics/8-01-physics-i-classical-mechanics-fall-1999/assignments/sol8.pdf
*Wednesday, November 27, 2013 at 2:18am by Elena*

**physics**

you have to specify a rotational axis.
*Tuesday, June 12, 2012 at 6:44pm by bobpursley*

**rotational mechanics**

Perfectly smooth floor? I know what happens to me on the ice rink...my feet go one way, and my body feels like it is going the other way, but by torso hits just where my feet started, and my head is really moving when it hits. Won't the rod do the same? What is the moment of ...
*Wednesday, March 31, 2010 at 11:46am by bobpursley*

**physics**

A diver can change his rotational inertia by drawing his arms and legs close to his body in the tuck position. After he leaves the diving board (with some unknown angular velocity), he pulls himself into a ball as closely as possible and makes 2.16 complete rotations in 1.31 s...
*Tuesday, December 4, 2007 at 12:17pm by stephanie*

**physics**

A bicycle has wheels of radius 0.3 m. Each wheel has a rotational inertia of 0.088 kg× m2 about its axle. The total mass of the bicycle including the wheels and the rider is 79 kg. When coasting at constant speed, what fraction of the total kinetic energy of the bicycle (...
*Tuesday, July 10, 2012 at 5:23pm by alicia*

**physics**

A merry-go-round in the park has a radius of 1.8 m and a rotational inertia of 900kgm^2. A child pushes the merry-go-round with a constant force of 80 N applied at the edges and parallel to the edge. A frictional torque of 12 Nm acts at the axle of the merry-go-round. a. what ...
*Sunday, October 17, 2010 at 8:21pm by Alyssa*

**Physics**

The rotational kinetic energy of one wheel is 1/2 * I * w^2 where I is the moment of inertia of the wheel, w is the angular speed of the wheel. The total kinetic energy of the system is the sum of the rotational kinetic energies of each wheel, plus the translational kinetic ...
*Tuesday, October 30, 2012 at 8:17pm by Jennifer*

Pages: **1** | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Next>>