Tuesday

July 28, 2015

July 28, 2015

Number of results: 62,466

**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...
*April 8, 2007 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?
*October 29, 2010 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?
*November 1, 2010 by lacey*

**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 ...
*December 2, 2010 by Tarren*

**physics**

A small ball with a mass of 0.05 kg moves along a circular orbit with a radius of 0.9 m at a speed of 9.0 m/s. What is the angular momentum of the ball? If the angular momentum of this ball were quantized in the same manner as the angular momentum of electrons in the Bohr ...
*April 22, 2014 by Anonymous*

**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?
*April 12, 2012 by Jessica*

**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...
*March 30, 2007 by COFFEE*

**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-...
*March 27, 2007 by Karla*

**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 ...
*October 4, 2010 by Franco Krause*

**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
*March 16, 2013 by qwerty*

**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 ...
*July 30, 2010 by Andre*

**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?
*October 14, 2009 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?
*October 14, 2009 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 ...
*December 16, 2012 by Bob*

**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 ...
*March 31, 2007 by COFFEE*

**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.
*April 27, 2011 by Zack*

**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...
*November 9, 2010 by Xavier Hernandez*

**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?
*December 23, 2011 by Lindsay*

**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?
*May 12, 2013 by Anthony*

**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)
*October 6, 2007 by Soly*

**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?
*July 13, 2012 by Jennifer*

**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 ...
*April 14, 2013 by Emily*

**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.
*March 14, 2012 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.
*April 8, 2012 by Nem*

**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 ...
*December 2, 2010 by Kevin*

**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?
*April 13, 2013 by Shelly*

**physics**

The electron in a certain hydrogen atom has an angular momentum of 6.834 × 10-34 J·s. What is the largest possible magnitude for the z component of the angular momentum of this electron? For accuracy, use h = 6.626 × 10-34 J·s. I know you need to use the equations Lz=ml* h/2*...
*July 23, 2014 by Lindsay*

**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 ...
*January 5, 2011 by Joey*

**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 ...
*December 1, 2006 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 ...
*December 2, 2006 by MIke*

**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 ...
*January 6, 2014 by alice*

**Physics.**

What is the transfer mechanism of energy, momentum, and angular momentum?
*November 27, 2011 by Kristin*

**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 ...
*November 11, 2013 by koka*

**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 ?
*March 29, 2014 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 ...
*August 22, 2013 by mechanics*

**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. ...
*February 2, 2009 by Alice*

**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 ?
*May 6, 2012 by juan *

**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 ...
*March 15, 2011 by jr*

**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.
*March 2, 2012 by CHRIS*

**Physics**

A mouse sits on a turntable 14.8 cm from the center. The coefficient of static friction is 0.49. The angular velocity increases steadily from zero. At what angular velocity does the mouse begin to slide? I believe that the max frictional force can be is momentum x normal force...
*October 24, 2014 by Neil*

**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 ...
*May 10, 2011 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 ...
*May 10, 2011 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 ...
*May 10, 2011 by Carole*

**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?
*April 25, 2013 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?
*April 26, 2013 by Nicole *

**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 ?
*October 25, 2013 by mary*

**Physics**

A sanding disk with rotational inertia 1.1 x 10^-3 kg*m^2 is attached to an electric drill whose motor delivers a torque of 6 Nm about the central axis of the disk. What are the following values about the central axis at the instant the torque has been applied for 185 ...
*March 30, 2007 by COFFEE*

**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!
*April 30, 2013 by Leila*

**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 ...
*April 8, 2007 by COFFEE*

**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 ...
*December 14, 2007 by Mary*

**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 ...
*October 23, 2010 by anil*

**PHYSICS help!!!!! =)**

An object is rotating with an angular momentum 4.00 kg m2/s while being acted on by a constant torque 3.00 Nm. What is the angular speed of precession of the angular velocity of the object? A.1.33 rad/s. B.0.750 rad/s. C.12.0 rad/s. D.zero. E.It depends on the moment of ...
*November 13, 2012 by Elyse*

**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
*November 3, 2009 by jeff*

**physics **

how do I solve for angular momentum if the weight its 700 g and the angular v is (1m=r, 120rmp). I get 12.56 for the v. But i don't know how to solve for the monentum. Also is my v correct?
*November 5, 2014 by Levin Need help for test!*

**Physics**

I have two questions, both are about angular momentum so I thought I'd post them together. I'm really confused on anything regarding rolling wheels and things like that (help me please!. It seems as though the whole chapter was amassed of all of the topics I cant wrap my head ...
*July 30, 2010 by Emily*

**physics**

An object of mass 5.0 kg is attached to a string of length 2.0 m and rotating in a horizontal circle with an angular velocity of 3.0 rad/s. What is the angular momentum of the object?
*June 10, 2014 by Anonymous*

**ap physics**

(a) Calculate the angular momentum of Earth that arises from its spinning motion on its axis, treating Earth as a uniform solid sphere. J · s (b) Calculate the angular momentum of Earth that arises from its orbital motion about the Sun, treating Earth as a point particle. J · s
*March 8, 2015 by yesica*

**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 ...
*December 14, 2007 by Mary*

**physics **

A planet A of mass m is in a circular orbit of radius "a" around a star ( M_star >> m ). Another planet B with the same mass m is in an elliptical orbit around the same star with its length of the semi-major axis equal to "a" . We have just learned that, in this case, ...
*November 15, 2013 by ashok*

**Physics please HELP**

A planet A of mass m is in a circular orbit of radius "a" around a star ( M_star >> m ). Another planet B with the same mass m is in an elliptical orbit around the same star with its length of the semi-major axis equal to "a" . We have just learned that, in this case, ...
*November 15, 2013 by ashok*

**physic angular momentum and torque**

What is the angular momentum of a figure skater spinning at 2.7rev/s with arms in close to her body, assuming her to be a uniform cylinder with a height of 1.6m , a radius of 14cm , and a mass of 50kg How much torque is required to slow her to a stop in 4.4s , assuming she ...
*March 29, 2014 by sammy*

**Physics**

Another Question---- A ball of clay of mass m travels with a velocity v in a path tangent to a disk of radius R and mass M. The clay collides with the disk tangentially to its outer rim (a totally inelastic collision) and the clay and disk begin to spin about the axis. a.) ...
*August 3, 2007 by bobby*

**PHYSICS ---HELP!**

Suppose there is a circular metal disk spinning at a constant angular velocity. Now imagine near to, but not in contact with the first disk, there is an identical metal disk spinning at the same angular velocity but in the opposite direction (ie. W1 = -w2) and the surfaces are...
*November 1, 2010 by emily*

**Physics**

The Angular momentum of an object that spins is determined by a. the rotational speed b. the mass of the object c. the choice of the axis of rotation d. all of the above I say d based on the fact that momentum =r*p where p is mv and r takes into account the axis
*April 28, 2009 by David*

**Physics-- Please Help!!**

Suppose there is a circular metal disk spinning at a constant angular velocity. Now imagine near to, but not in contact with the first disk, there is an identical metal disk spinning at the same angular velocity but in the opposite direction (ie. W1 = -w2) and the surfaces are...
*November 1, 2010 by emily*

**Physics**

A rotating uniform-density disk of radius 0.7 m is mounted in the vertical plane. The axle is held up by supports that are not shown, and the disk is free to rotate on the nearly frictionless axle. The disk has mass 5 kg. A lump of clay with mass 0.3 kg falls and sticks to the...
*November 8, 2012 by Udit*

**Physics**

Suppose I have a circular metal disk spinning at a constant angular velocity. Now imagine near to, but not in contact with the first disk, I have an identical metal disk spinning at the same angular velocity but in the opposite direction (ie. W1 = -w2) and the surfaces are ...
*October 29, 2010 by Mark*

**physics**

Suppose I have a circular metal disk spinning at a constant angular velocity. Now imagine near to, but not in contact with the first disk, I have an identical metal disk spinning at the same angular velocity but in the opposite direction (ie. W1 = -w2) and the surfaces are ...
*October 29, 2010 by Mark*

**physics**

Each of the following objects has a radius of 0.169 m and a mass of 2.02 kg, and each rotates about an axis through its center (as in this table) with an angular speed of 38.6 rad/s. Find the magnitude of the angular momentum of each object. (a) a hoop kg · m2/s (b) a solid ...
*March 8, 2015 by alba*

**physics**

Suppose I have a circular metal disk spinning at a constant angular velocity. Now imagine near to, but not in contact with the first disk, I have an identical metal disk spinning at the same angular velocity but in the opposite direction (ie. W1 = -w2) and the surfaces are ...
*November 1, 2010 by Mark*

**Applied Machanics (Physics)**

A steel rod of 500g and 30 cm long spins at 300 RPM,the rod pivots around the center. a) Find angular momentum Moment of Inertia(I)=mk^2 I=0.5kgX(0.075m)^2 I=0.0028125kg*m^2 To find angular momentum: w=300rpmX2pi/60sec w=31.42 rads/s Ang. Momentum=Iw A.M.=0.0028125X31.42 A.M.=...
*May 3, 2009 by Henri*

**Physics**

A thin rod of length L and mass M rotates about a vertical axis through its center with angular velocity w. The rod makes an angle B with the rotation axis. Determine the angular momentum of the rod.
*April 18, 2008 by Nik*

**Science **

When a net torque is applied to a rigid object it always produces a 1. constant acceleration 2. rotational equilibrium 3. constant angular velocity 4. constant angular momentum 5. change in angular velocity
*September 20, 2010 by Franco Krause*

**physics**

A particle of mass 0.350 kg is attached to the 100-cm mark of a meter stick of mass 0.175 kg. The meter stick rotates on a frictionless, horizontal table with an angular speed of 6.00 rad/s. (a) Calculate the angular momentum of the system when the stick is pivoted about an ...
*October 22, 2012 by Karrine*

**Physics**

A puck (uniform disk) of mass m and radius r is travelingat a speed v on frictionless ice. It strikes a second identical puck a glancing blow (at point P) and sticks to it (using VelcroTM). After the collision, the two-puck-object rotates with angular velocity ω about its...
*November 30, 2014 by Alex*

**Physics**

Give 3 examples of applications of the conservation of angular momentum.
*September 30, 2010 by winget*

**Physics**

What is the angular momentum of the second hand on a clock if the clock has a length of 25cm, a mass of 20g, and is rotating with constant angular velocity. Treat the second hand as a thin rod.
*June 29, 2011 by Jocelyn *

**Re: Physics (check)**

Posted by COFFEE on Friday, March 30, 2007 at 4:16am. A sanding disk with rotational inertia 1.1 x 10^-3 kg*m^2 is attached to an electric drill whose motor delivers a torque of 6 Nm about the central axis of the disk. What are the following values about the central axis at ...
*March 31, 2007 by COFFEE*

**Physics**

11-098-satellite_and_junk.jpg A spherical satellite of radius 4.6 m and mass M = 195 kg is originally moving with velocity vsatellite,i = < 3000, 0, 0 > m/s, and is originally rotating with an angular speed ?1 = 2 radians/second, in the direction shown in the diagram. A ...
*April 14, 2013 by Emily*

**Physics - Torque**

A particle is acted on by two torques about the origin: T1 has a magnitude of 4.3 N*m and is directed in the positive direction of the x axis, and T2 has a magnitude of 3.2 N*m and is directed in the negative direction of the y axis. What are the magnitude [in N*m] and ...
*March 31, 2007 by COFFEE*

**physics**

Two astronauts, each having a mass of 78.5 kg, are connected by a 10.0-m rope of negligible mass. They are isolated in space, moving in circles around the point halfway between them at a speed of 5.50 m/s. Treating the astronauts as particles, calculate each of the following...
*December 1, 2012 by heather*

**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 ...
*April 30, 2009 by David*

**Physics**

A merry-go-round is rotating at 4.775 revs/min with a 45 kg child on the outer edge. The radius is 2.0 m. The child moves to the centre of the merry go round. What is the final angular velocity of the merry go round. The moment of inertia of the merry-go-round is 360kgm^s ...
*December 15, 2010 by Jon*

**CUC**

1.Two masses of 4gm and 6gm respectively are attached to the ends of a light rod of negligible mass and the rod rotates anticlockwise at the rate of 2rev/sec about an axis passing through the center of mass and perpendicular to its length. Calculate (a)the angular momentum of ...
*May 26, 2012 by Theresa *

**Physics (very long question)**

Two astronauts (Fig. P8.68), each having a mass of 84.0 kg, are connected by a 10.0 m rope of negligible mass. They are isolated in space, moving in circles around the point halfway betwen them at a speed of 5.80 m/s. Treating the astronauts as particles, calculate each of the...
*November 18, 2010 by Anonymous*

**Physics**

An 83.2-kg propeller blade measures 2.24m end to end. Model the blade as a thin rod rotating about its center of mass. It's initially turning at 175rpm. Find the blade's angular momentum, the tangential speed at the blade tip, and the angular acceleration and torque required ...
*November 11, 2011 by Jessica*

**physics**

An 83.2-kg propeller blade measures 2.24m end to end. Model the blade as a thin rod rotating about its center of mass. It's initially turning at 175rpm. Find the blade's angular momentum, the tangential speed at the blade tip, and the angular acceleration and torque required ...
*November 12, 2011 by Tyler*

**physics**

An 83.2-kg propeller blade measures 2.24m end to end. Model the blade as a thin rod rotating about its center of mass. It's initially turning at 175rpm. Find the blade's angular momentum, the tangential speed at the blade tip, and the angular acceleration and torque required ...
*November 12, 2011 by Tyler*

**physics**

Each of the following objects has a radius of 0.180 m and a mass of 2.65 kg, and each rotates about an axis through its center (as in the table below) with an angular speed of 41.4 rad/s. Find the magnitude of the angular momentum of each object. a) a hoop ___ kg m/s b) a ...
*December 15, 2012 by anonymous*

**physics**

Each of the following objects has a radius of 0.180 m and a mass of 2.65 kg, and each rotates about an axis through its center (as in the table below) with an angular speed of 41.4 rad/s. Find the magnitude of the angular momentum of each object. a) a hoop ___ kg m/s b) a ...
*December 15, 2012 by anonymous*

**physics**

12. Which of the following statements is correct for a particle moving in a horizontal circle with constant angular velocity? A. The linear momentum is constant but the kinetic energy varies. B. The kinetic energy is constant but the linear momentum varies. C. Both kinetic ...
*November 1, 2013 by shanza*

**physics**

A 0.400 kg ball is shot directly upward at initial speed 40.0 m/s. What is its angular momentum about a point 2.0 m horizontal from the launch point, when the ball is a) at maximum height and b) halfway back to the ground? What is the torque on the ball about the point 2m from...
*June 13, 2009 by jane*

**physics**

A spinning disk of mass 5.0 kg and radius 0.25m is rotating about an axis through its center at 400 rev/min. a.) What is the angular velocity of the disk in rad/s? b.) What is the moment of inertia of the disk? c.) If it accelerates at a constant rate to 800 rev/min in 8 sec, ...
*July 29, 2012 by Lauren*

**Physics**

A spinning disk of mass 5.0 kg and radius 0.25m is rotating about an axis through its center at 400 rev/min. a.) What is the angular velocity of the disk in rad/s? b.) What is the moment of inertia of the disk? c.) If it accelerates at a constant rate to 800 rev/min in 8 sec, ...
*July 29, 2012 by Lauren*

**Physics**

. (a) Calculate the angular momentum of an ice skater spinning at 6.00 rev/s given his moment of inertia is 0.400 kg ⋅ m2. (b) He reduces his rate of spin (his angular velocity) by extending his arms and increasing his moment of inertia. Find the value of his moment of ...
*July 14, 2013 by Justin*

**physics**

(a) Calculate the angular momentum of an ice skater spinning at 6.00 rev/s given his moment of inertia is 0.490 kg·m2. (b) He reduces his rate of spin (his angular velocity) by extending his arms and increasing his moment of inertia. Find the value of his moment of inertia if ...
*July 17, 2013 by Wendy*

**Physics**

What is the angular momentum (in J*s) of a mass of 1.45 kg which completes an orbit about a point 23.0 meters away every 5.30 seconds.
*November 1, 2012 by Steeve*

**angular momentum**

a 8.20 kg particle P has a position vector of magnitude 6.90 m and angle θ1 = 42.0° and a velocity vector of magnitude 6.70 m/s and angle θ2 = 25.0°. Force , of magnitude 8.90 N and angle θ3 = 28.0° acts on P. All three vectors lie in the xy plane. About the ...
*May 30, 2012 by jose*

**U. Phys**

What is the angular momentum of a 3.7kg uniform cylindrical grinding wheel of radius 25cm when rotating at 1500rpm? How much torque(in magnitude) is required to stop it in 5.0s? Could you explain this in detail, I don't really understand torque and momentum well.
*November 2, 2009 by Taylor*

**physics **

for an 84 kg person standing at the equator what is the magnitude of angular momentum about the earths center due to earth's rotation
*October 31, 2012 by Guy*