Friday

April 18, 2014

April 18, 2014

Number of results: 109,535

**Physics-Change in Angular Momentum**

Angular momentum about the spin axis is conserved. The planet with added asteroid will gain angular momentum equal to that of the asteroid before collision. You have not said what the initial planet mass or angular momentum was. Angular momentum change = m*v*R*sin40 It can be ...
*Sunday, May 12, 2013 at 8:36pm by drwls*

**physics**

angular momentum of a hoop is m*r^2; the angular momentum of a solid cylinder is 1/2*m*r^2; the angular momentum of a solid sphere is 2/5*m*r^2; the Angular momentum of a hollow spherical shell is 2/3*m*r^2
*Saturday, December 15, 2012 at 11:56pm by Jennifer*

**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 - 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**

Consider a hoola-hoop of radius R and it is spinning about its symmetry axis at a constant angular velocity. Now, I double its mass and halve its angular velocity. What is the new angular momentum in terms of the initial angular momentum?
*Friday, October 29, 2010 at 12:09pm by Emily*

**PHYSICS ---HELP!**

Consider a hoola-hoop of radius R and it is spinning about its symmetry axis at a constant angular velocity. Now, I double its mass and halve its angular velocity. What is the new angular momentum in terms of the initial angular momentum?
*Monday, November 1, 2010 at 12:35pm by lacey*

**Physics**

Hint: Angular momentum is conserved. The initial angular velocity is w1 = (2*pi)/5 = 1.26 rad/s Moment of inertia of the platform is I = (1/2) M R^2 = 180 kg*m^2 There is additional angular momentum due to the children. Conservation of angular momentum requires that: I*w1 + 2 ...
*Friday, May 6, 2011 at 12:19pm by drwls*

**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*

**Angular momentum**

What was the starting value of angular momentum? The product of torque and time equals the change in angular momentum. (change in angular momentum) = 345.6 N*m*s = 345.6 kg*m^2/s
*Saturday, April 13, 2013 at 3:53pm by drwls*

**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**

Assume the total angular momentum remains zero (due to frictionless bearing). If the angular velocity of the lazy susan is w, its angular momentum is I*w, where I = (1/2)M*R^2 The angular momentum of the kokroach is equal and opposite to that of the lazy susan. I*w = m*R*v ...
*Tuesday, May 22, 2012 at 10:14pm by drwls*

**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*

**physical science**

(1) The direction and angular momentum of its spin (2) The direction and angular momentum of its orbital angular momentum (3) The total angular momentum (orbital and spin) and its projection along a specific axis.
*Friday, March 22, 2013 at 11:05pm by drwls*

**Science **

A spinning star begins to collapse under its own gravitational pull. Which one of the following occurs as the star becomes smaller? 1.Its angular velocity decreases. 2.Its angular momentum increases. 3.Its angular velocity remains constant. 4. Its angular momentum remains ...
*Monday, October 4, 2010 at 4:29am by Franco Krause*

**Physics**

angular momentum change is the integral of torque, which is a time-dependent functiuon in this case. (I*w)@t=3s - (I*w)@t=1s = Integral (5 + 2t) dt t = 1 to t = 3 = 5*(3-1) + (3^2 - 1^2) = 10 + 8 = 18 Add 5 (the initial angualr momentum) to that for the angular momentum at 3 s.
*Wednesday, April 27, 2011 at 9:21pm by drwls*

**Astronomy**

Black holes can be completely described by which three parameters? -angular momentum, spin, and electric charge -angular momentum, density, and radius -mass, angular momentum, and electric charge -mass, angular momentum, and radius
*Saturday, March 16, 2013 at 1:36am by qwerty*

**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-Change in Angular Momentum**

The planet has mass M and is spinning in a counterclockwise direction. I know the asteroid will increase the momentum of the planet, so the total change in angular momentum is equal to positive. m*v*R*sin(40) ?
*Sunday, May 12, 2013 at 8:36pm by Anthony*

**Physics-Change in Angular Momentum**

The planet has mass M and is spinning in a counterclockwise direction. I know the asteroid will increase the momentum of the planet, so the total change in angular momentum is equal to positive. m*v*R*sin(40) ?
*Sunday, May 12, 2013 at 8:36pm by Anthony*

**Physics**

What does it mean to say that angular momentum is conserved? Give an example you might see on Earth. How could conservaton of angular momentum help astronomers understand the development of the solar system?
*Wednesday, October 14, 2009 at 12:17pm by Riley*

**Physics**

What does it mean to say that angular momentum is conserved? Give an example of what you might see on Earth. How could conservation of angular momentum help astronomers understand the development of the solar system?
*Wednesday, October 14, 2009 at 6:14pm by Kayla*

**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 woman with a mass of 50kg is standing on the rim of a large disk that is rotating at an angular velocity of .50 rev/s about an axis through its center. The disk has a mass of 110kg and a radius of 4.0m. Calculate the magnitude of the total angular momentum of the woman-plus-...
*Tuesday, March 27, 2007 at 3:31pm by Karla*

**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 Angular Momentum**

Initial angular momentum of bullet around axis of wheel = I w = m r^2 w = m r v = .00483 * .148 * 330 = .2359 Final angular momentum of bullet around axis of wheel = .00483 * .148 * 201 = .1437 change in angular momentum of bullet = .2359 - .1437 = .0922 that is the angular ...
*Monday, July 11, 2011 at 6:46pm by Damon*

**Physics**

Angular momentum is M*V*R, since V is perpendicular to the R vector. Convert V to m/s and R to meters before multiplying. Except for including the direction of angular momentum, your two questions are the same. Get it from the cross product VxR and the right-hand rule
*Friday, December 23, 2011 at 1:23pm by drwls*

**physics**

There is no question here. Perhaps they want to know what happens to the angular speed of revolution. It speeds up by a factor of 4, to keep the angular momentum constant. The mass is not important; it cancels out of the angular momentum conservation equation. Is the 1.75 in ...
*Tuesday, November 17, 2009 at 12:46am by drwls*

**Physics**

A runner with mass 100 kg jogs around a circular track with circumference 1 km. If he does one lap in 6 min, what is his angular momentum about the center of the track?
*Friday, February 4, 2011 at 4:38am by Angular Momentum*

**Physics-Change in Angular Momentum**

What is the change in angular momentum of a planet with radius R if an asteroid mass m and speed v hits the equator at an angle from the west, 40 degrees from the radial direction?
*Sunday, May 12, 2013 at 8:36pm by Anthony*

**Physics**

The initial angular momentum of disc 1 is I1 w1 The initial angular momentum of disc 2 is I2 w2 Add those for total angular momentum, which DOES NOT CHANGE in this problem because there are no external moments Afterwards the no slip condition: R1 w1 = R2 W2 calculate the ...
*Wednesday, October 30, 2013 at 10:35am by Damon*

**physic**

Angular momentum has to be conserved. angular momentum sphere= 2/5 mr^2 * w so if you are increasing r by a factor of 100, then w must decrease by a factor of 10000 to keep angular momentum constant. So, velocity at the new average radius is wnew*rnew= 1/10000 * 100= 1/100 of ...
*Wednesday, March 5, 2008 at 4:35pm by bobpursley*

**Physics**

What does it mean to say that angular momentum is conserved? Give an example you might see on Earth. How could conservation of angular momentum help astronomers understand the development of the solar system? (this the part of the question that I dont understand)
*Saturday, October 6, 2007 at 10:18pm by Soly*

**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**

The angle, angular velocity, angular momentum and angular acceleration terms would have to be multiplied by 180/pi (degrees per radian).
*Sunday, April 11, 2010 at 10:48am by drwls*

**Physics**

A 2.1 kg particle-like object moves in a plane with velocity components vx = 30 m/s and vy = 55 m/s as it passes through the point with (x, y) coordinates of (3.0, -4.0) m. (a) What is its angular momentum relative to the origin at this moment? kg · m2/s (b) What is its ...
*Friday, July 30, 2010 at 3:32pm by Andre*

**Physics**

A disk with a rotational inertia of 7 kgm^2 rotates like a merry-go-round while undergoing a torque given by (5+2t)Nm. At time 1s, its angular momentum is 5kg m^2/s. what is its angular momentum at 3s? I can't figure out how to start this problem.
*Wednesday, April 27, 2011 at 9:21pm by Zack*

**Physics (Angular Momentum)**

A solid ball of radius 10cm and mas 8kg rolls in the y direction with a speed of 10 m/s At the instant that it is 3m from the origin along the x axis, what is the angular momentum (mag + direction) about its center of mass?
*Friday, July 13, 2012 at 4:28pm by Jennifer*

**physics**

Angular momentum will conserved, and the total moment of inertia (I) is tripled. Since angular momentum is I*w, the angular spped w must be reduced to 1/3 of the original value. With w reduced to 1/3 of the original and I tripled, the kinetic energy (1/2) I w^2 will be reduced...
*Friday, December 3, 2010 at 3:38pm by drwls*

**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**

She has increased her moment of inertia. Angular momentum is conserved; angular momentum = inertia*angular velocity if inertia is increased, angular velocity....
*Thursday, October 7, 2010 at 3:48pm by bobpursley*

**AP Physics**

Use the law of conservation of angular momentum, measured about the vertical axis. Initially, the rod has no angular momentum but the bullet has angular momentum m V (L/2) cos 60 about that axis. Afterwards, the rod with embedded bullet has moment of inertia I = (1/12)ML^2 + m...
*Friday, February 8, 2008 at 6:10pm by drwls*

**Physics**

So what does this have to do with helping astronomers understand the development of the solar system? When the Earth rotates on its axis, is this part of angular momentum being conserved? Does angular momentum show the astronomers how the earth and other planets rotate?
*Saturday, October 6, 2007 at 10:18pm by Riley*

**physics**

Compute the linear momentum and angular momentum of a Frisbee of mass 0.175 kg if it has a linear speed of 1.65 m/s and an angular velocity of 61.5 rad/s. Treat the Frisbee as a uniform disk of radius 12.0 cm.
*Wednesday, March 14, 2012 at 1:09pm by John*

**Physics**

Compute the linear momentum and angular momentum of a Frisbee of mass 0.160 kg if it has a linear speed of 2.00 m/s and an angular velocity of 50.0 rad/s. Treat the Frisbee as a uniform disk of radius 15.0 cm.
*Sunday, April 8, 2012 at 9:28pm by Nem*

**Angular momentum**

What is the angular momentum if the force is 72 N, the time is 1.5seconds and the lever arm is 3.2 meters?
*Saturday, April 13, 2013 at 3:53pm by Shelly*

**college physics**

The total angular momentum remains zero because of the frictionless bearings. The person and the turntable rotate about the axis of rotation in opposite directions. Let w be the angular velocity of the turntable after "the person" begins running. His (or her) angular momentum ...
*Monday, March 29, 2010 at 9:50am by drwls*

**Physics- Angular Momentum**

The moment of inertia of the rod rotating about its center is M*L^2/12 When the idential masses m are at radius R, the moment of intertia due to their masses is 2*m*R^2 The total angular momentum remains unchanged. Let w1 be the initial angular velocity. A) When the masses ...
*Tuesday, December 28, 2010 at 3:22pm by drwls*

**physics help 4 please!!**

<<do you use conservation of torque?>> There is no torque on the branch. Angular momentum about the center of the branch is conserved. They each move from 3 to 5 m from the center of the branch. Angular velocity w decreases by a ratio 3/5 to keep the angular ...
*Friday, October 31, 2008 at 12:05am by drwls*

**Physics**

A 1.1 kg particle-like object moves in a plane with velocity components Vx = 30 m/s and Vy = 90 m/s as it passes through the point with (x, y) coordinates of (3.0, -4.0) m. (a) What is its angular momentum relative to the origin at this moment? _____ kg*m^2/s k (b) What is its...
*Friday, March 30, 2007 at 4:25am by COFFEE*

**Angular Momentum**

2.0 kg particle-like object moves in a plane with velocity components vx = 30 m/s and vy = 35 m/s as it passes through the point with (x, y) coordinates of (3.0, -4.0) m. (a) What is its angular momentum relative to the origin at this moment? kg·m2/s k (b) What is its angular...
*Tuesday, November 9, 2010 at 8:11pm by Xavier Hernandez*

**Physics**

A device consists of eight balls each of mass 0.4 kg attached to the ends of low-mass spokes of length 1.8 m, so the radius of rotation of the balls is 0.9 m. The device is mounted in the vertical plane. The axle is held up by supports that are not shown, and the wheel is ...
*Sunday, April 14, 2013 at 4:01pm by Emily*

**Physics**

An airplane of mass 2180 kg located 131 km north of U is ying 272 km/hr in an easterly direction. (a) What is the magnitude of the angular momentum (kg m2/s) with respect to U? (b)what is the angular momentum with respect to U?
*Friday, December 23, 2011 at 1:23pm by Lindsay*

**Physics**

angular momentum around pivot is the same before and after before angular momentum = m v r = .7*4*1.2 = 3.36 kg m^2/s after let w = omega = ang velocity about pivot angular momentum = I w I = (1/3)(3.1)(1.6^2) + .7(1.2^2) = 2.645 + 1.008 = 3.65 so I w = 3.36 3.65 w = 3.36 w...
*Wednesday, February 12, 2014 at 2:48pm by Damon*

**physics**

A hydrogen atom is in its n = 6 excited state. Determine, according to quantum mechanics, each of the following: (a) The total energy =eV (b) The magnitude of the maximum angular momentum the electron can have in this state =J s (c) The maximum value that the z component of ...
*Friday, December 1, 2006 at 6:15pm by MIke*

**physics**

A hydrogen atom is in its n = 6 excited state. Determine, according to quantum mechanics, each of the following: (a) The total energy =eV (b) The magnitude of the maximum angular momentum the electron can have in this state =J s (c) The maximum value that the z component of ...
*Saturday, December 2, 2006 at 1:54pm by MIke*

**Physics**

Typo: momentum --> angular momentum
*Thursday, June 25, 2009 at 11:59pm by Count Iblis*

**Physics.**

What is the transfer mechanism of energy, momentum, and angular momentum?
*Sunday, November 27, 2011 at 1:12am by Kristin*

**physics**

What is the ratio of the spin angular momentum of the earth and its orbital angular momentum about the sun. The mean radius of the earth is R=6400km. The radius of the earth's orbit is r=1.5*10^8km. You may assume the mass of the earth is uniformly distributed throughout its ...
*Monday, January 6, 2014 at 1:06pm by alice*

**physics**

conservation of momentum applies, in this case, angular momentum. Diskmomentum=I*w Boy momentum=33*r*2PI*.2/60 set them equal, w will be in rad/sec disk moment of inertial is 1/2*240*r if you didn't know. Thin disk.
*Wednesday, November 18, 2009 at 4:06pm by bobpursley*

**Physics**

That's correct. Try to think about why angular momentum is conserved and why kinetic energy is not conserved. You can also consider a similar problem where the cord is not pulled but instead it is wrapping itself around a stick. What happens to angular momentum and kinetic ...
*Thursday, June 25, 2009 at 11:59pm by Count Iblis*

**physics**

Their angular velocity about the center of rotation is w = V/R = 5.0/6 = 0.833 rad/s The angular momentum is 2*M*w*R^2 where M is the mass of a single astronaut
*Sunday, November 11, 2012 at 7:43pm by drwls*

**Re: Physics**

Posted by COFFEE on Friday, March 30, 2007 at 4:25am. A 1.1 kg particle-like object moves in a plane with velocity components Vx = 30 m/s and Vy = 90 m/s as it passes through the point with (x, y) coordinates of (3.0, -4.0) m. (a) What is its angular momentum relative to the ...
*Saturday, March 31, 2007 at 5:33am by COFFEE*

**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*

**Physic Angular momentum and torque**

What is the angular momentum of a 1.0kg uniform cylindrical grinding wheel of radius 19cm when rotating at 1700rpm ?How much torque is required to stop it in 4.6s ?
*Saturday, March 29, 2014 at 11:19am by David*

**physics**

A PARTICLE OF MASS M IS SHOT WITH an initial velocity v making an angle b with the horizontal,the particle moves in the gravitational field of the earth. find the angular momentum of the particle about the origin when the particle is at the origin ,at the highest point of its ...
*Thursday, August 22, 2013 at 7:23pm by mechanics*

**Physics**

No, of course not. Angular momentum is conserved. You reduced the moment of interia (rotational inertia is a really bad term), so angular velocity has to change.
*Thursday, April 30, 2009 at 11:19am by bobpursley*

**physics**

Treat the ball as a point mass, since it is at the end of a striking much larger than the sphere. The angular momentum is M V R = M R^2 w Where w is the angular velocity
*Thursday, April 12, 2012 at 5:37pm by drwls*

**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**

The satellite sweeps out equal areas in equal time (Kepler). As its distance from the sun gets smaller, its speed has to get bigger to sweep out the same area per hour. There is no torque on the thing. Torque is rate of change of angular momentum. No torque ---> constant ...
*Saturday, January 19, 2008 at 10:23pm by Damon*

**Physics**

What is the smallest possible value for the angular momentum L of an electron in the n=5 shell? Lmin= 0 kg*m^2/s What is the largest possible value for the angular momentum L of an electron in the n=5 shell? What is the Lmax? Please help I don't get this.Thank you!
*Tuesday, April 30, 2013 at 6:58pm by Leila*

**Physics please HELP**

What is the ratio of the spin angular momentum of the Earth and its orbital angular momentum about the Sun. The mean radius of the earth is R_earth = 6400 km. The radius of the Earth's orbit is r_s = 1.5 * 10^8 km. For simplicity you may assume that the mass of the Earth is ...
*Monday, November 11, 2013 at 10:38pm by koka*

**College Physics**

a. The linear momentum of the ball (m(o) – 0.64 kg), v =20 m/s) is p = m(o)•v . The angular momentum is L = m(o)•v•R . On the other hand, the angular momentum is L =I•ω, where the total moment of inertia (merry-go-round + the child) is I = mR^2 +MR^2/2. m(o)•v•R =( mR^2 +...
*Sunday, April 8, 2012 at 6:23pm by Elena*

**Physics**

Use conservation of momentum Initial momentum: The momentum of inertia of the objects the students is m*r^2 (3.0 + 3.4*1^2 + 3.4*1^2)*wi = (3.0 + 3.4*.45^2 + 3.4*.45^2)*wf where wi = 0.75 is the initial angular momentum, and wf is the final angular momentum. Solve for wf b) ...
*Tuesday, November 27, 2012 at 10:59pm by Jennifer*

**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**

In a long jump, an athlete leaves the ground with an initial angular momentum that tends to rotate his body forward, threatening to ruin his landing. To counter this tendency, he rotates his outstretched arms to "take up" the angular momentum. In 0.393 s, one arm sweeps ...
*Tuesday, March 15, 2011 at 12:15pm by jr*

**Maths**

A particle rotates in a circular orbit about a point located 30cm away, with angular speed 2 rad s^-1. If the angular momentum is 0.2 Js, determine the mass of the particle. I used L=mr^2 omega and got 1.11kg A constant torque of 0.2Nm accelerates the particle for 5s. ...
*Monday, February 2, 2009 at 9:23am by Alice*

**physics**

Hints: when they shorten the rope, there is no external moment on he system so the angular momentum CAN NOT change. Get the new (higher)speeds from conservation of angular momentum. they did work shortening the rope so the energy goes up the work done equals the change in ...
*Saturday, December 1, 2012 at 8:47pm by Damon*

**Physics**

No torque was exerted on the skater to increase the spin rate. The angular momentum I*w remained the same. The angular velocity w increased while the moment of intertia (I) decreased.
*Friday, February 12, 2010 at 6:52pm by drwls*

**physics**

What is the angular momentum (in kilogram-meter^2/second) of a 500.0 g ball rotating on the end of a string in a circle of radius 1.54 m at an angular speed of 2.50 rad/s?
*Thursday, April 25, 2013 at 7:24pm by BG*

**physics**

What is the angular momentum (in kilogram-meter^2/second) of a 500.0 g ball rotating on the end of a string in a circle of radius 1.45 m at an angular speed of 1.50 rad/s?
*Friday, April 26, 2013 at 12:17pm by Nicole *

**Physics**

A satellite of mass m is in Keplerian orbit around a parent body of mass M >>m. The satellite has total energy E and angular momentum l, where angular momentum is measured about the parent body and the zero of potential energy is at infinity. Detnermine the semimajor ...
*Tuesday, May 10, 2011 at 3:58pm by Carole*

**Physics**

A satellite of mass m is in Keplerian orbit around a parent body of mass M >>m. The satellite has total energy E and angular momentum l, where angular momentum is measured about the parent body and the zero of potential energy is at infinity. Detnermine the semimajor ...
*Tuesday, May 10, 2011 at 5:08pm by Ferdinand*

**Physics**

A satellite of mass m is in Keplerian orbit around a parent body of mass M >>m. The satellite has total energy E and angular momentum l, where angular momentum is measured about the parent body and the zero of potential energy is at infinity. Detnermine the semimajor ...
*Tuesday, May 10, 2011 at 9:16pm by Carole*

**Physics please explain**

In the quantum mechanical picture of the hydrogen atom, the orbital angular momentum of the electron may be zero in any of the possible energy states. For which energy state must the orbital angular momentum be zero? n = 1 n = 2 n = 3 n = 4 Give your reasoning. I am not sure ...
*Friday, December 14, 2007 at 1:33am by Mary*

**Physics - Conservation of Angular Momentum**

a man is standing on the center of a platform that is rotating without friction. his arms are outstretched holding a brick in each hand. the rotational inertia of the system consists of the man, bricks, and platform about the central vertical axis of the platform. by moving ...
*Sunday, April 8, 2007 at 1:07am by COFFEE*

**physics**

A small stone of mass m is stuck on the periphery of a wheel of radius R rolling along the x-axis with a constant speed v. The centre of the wheel was at x = 0 at time t = 0, and stone was on the ground at that time. Find the angular momentum of the stone and its rate of ...
*Saturday, October 23, 2010 at 8:39am by anil*

**Physics ang. momentum**

The kinetic energy can increase because of muscular work done going into the tuck position. Remember that I * w remains constant. Angular momentum conservation is not violated. If the momen t of inertia I decreases by a factor of 3.5,then the angular frequency w increases by a...
*Monday, December 7, 2009 at 12:29am by drwls*

**Physics**

YOu know the initial angular moentum, the final moment of inertia= initial + 10mass*r^2 solve the conservation of angular momentum problem.
*Monday, January 27, 2014 at 10:10pm by bobpursley*

**physics**

A 1.8 kg particle-like object moves in a plane with velocity components vx = 20 m/s and vy = 50 m/s as it passes through the point with (x, y) coordinates of (3.0, -4.0) m. (a) What is its angular momentum relative to the origin at this moment? 1 kg · m2/s (b) What is its ...
*Wednesday, January 5, 2011 at 9:31am by Joey*

**Physics please HELP**

This is from http://en.wikipedia.org/wiki/Angular_momentum "............. The conservation of angular momentum is used extensively in analyzing what is called central force motion. If the net force on some body is directed always toward some fixed point, the center, then there...
*Tuesday, November 12, 2013 at 6:46pm by Damon*

**physics**

There is a dynamic relationship between torque about the pivot and the rate of change of angular momentum, that can be written as a differential equation If the linear deflection at the attachment point is X, the angular deflection A is A = X/L The angular momentum is I dA/dt ...
*Tuesday, December 11, 2007 at 11:18pm by drwls*

**physics**

angular momentum initial = I omega I = (1/2) m r^2 = (1/2)(50).26^2 860 what? rpm? 860 rev/min * 1/60 min/sec * 2 pi radians/rev = 90 rad/sec so Iw= 152 torque * time = change of angular momentum 250 N * mu * 7.4 sec = 152 I am just guessing at your units for everything
*Friday, May 3, 2013 at 7:06pm by Damon*

**chemistry**

Calculate the angle which the spin angular momentum of a single electron forms with the z axis in alpha and beta spin states. What are the possible angles of the spin angular momentum for a two-electron triplet state
*Tuesday, November 3, 2009 at 11:44am by jeff*

**physics**

Initial angular momentum about axis = Mbullet*Vbullet*R This equals the final angular momentum, (Iwheel + Mbullet*R^2)*w_final w_final = (Mbullet*Vbullet)*R/(Iwheel + Mbullet*R^2)
*Saturday, December 4, 2010 at 9:10am by drwls*

**pHysics !!**

you know the height it went, what PE does it have, At the bottom when starting, it had that KE. From that, determine the velocity of block/bullet at impact. now use conservation of momentum at impact (M+m)V= momentumbullet and now determine velocity bullet Momentumbullet=m*v c...
*Sunday, September 1, 2013 at 11:23am by bobpursley*

**Physic please check**

Consider two different hydrogen atoms. The electron in each atom is in an excited state. (a) Is it possible for the electrons to have different energies but the same orbital angular momentum L, according to the Bohr model? Justify. No.Electrons within the same obital angular ...
*Friday, December 14, 2007 at 1:09am by Mary*

**Physics**

distance of Center of rod from pivot = 3d/6 - 2d/6 = d/6 so I about pivot = (1/12)M d^2 + M d^2/36 = (1/9)Md^2 = (4/9)m d^2 distance of mass trajectory from pivot = d/3 angular momentum of m about pivot before collision = m vo r = m vo d/3 = total ang momentum of system about ...
*Friday, January 10, 2014 at 8:20am by Damon*

**Physics**

A 0.006-kg bullet traveling horizontally with a speed of 1.00 103 m/s enters an 21.1-kg door, imbedding itself 10.4 cm from the side opposite the hinges as in the figure below. The 1.00-m-wide door is free to swing on its hinges. ------------------------------------- C) ...
*Friday, March 19, 2010 at 7:36pm by Damon*

**Physics**

a) is the correct answer. c) is not necessarily correct because the torque can be at right angles to the angular moemntum, causing only the direction of the angular momentum vector to change and not its magnitude.
*Tuesday, April 28, 2009 at 1:06pm by Count Iblis*

**physics**

Angular momentum is conserved. The boy has an initial angular momentum about the merry-go-round's axis of m V R. V is the boy's initial velocity Let the final angular velocity of boy and merry-go-round be w. m V R = (I + m R^2) w w = mVR/(I + m R^2) Final KE = (1/2)(I + mR^2)w...
*Wednesday, December 1, 2010 at 4:42am by drwls*

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