Angular momentum is conserved when: O No answer text provided. O the external torque is greater than "m" times "a" O the external torques is zero O the external torque is parallel to the axis of rotation
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A:
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
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cross product is
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vectors
Ounknown, it is a
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O the same as the first
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O the same as the
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- a)What is the angular momentum of a figure skater spinning at 3.4 rev/s with arms in close to her body, assuming her to be a uniform cylinder with a height of 1.4 m , a radius of 16cm , and a mass of 49kg ? b)How much torque is required to slow her to a stop in 4.8 s , assuming she does not move her arms?empt in Progress A sanding disk with rotational inertia 3.7 x 103 kg-m² is attached to an electric drill whose motor delivers a torque of magnitude 39 N-m about the central axis of the disk. About that axis and with torque applied for 90 ms, what is the magnitude of the (a) angular momentum and (b) angular velocity of the disk? (a) Number i (b) Number i eTextbook and Media Hint Save for Later C 80 Ơ 2 Units Units 0 F5 + G F6 + tv MacBook Air F7 I Attempts: 0 of 4 used Submit Answer DII F8 F9 A F10A 7.62 kg particle with velocity = (9.74 m/s )î - (2.04 m/s ) Ĵ is at x = 3.16 m, y = 9.00 m. It is pulled by a 6.30 N force in the negative x direction. About the origin, what are (a) the particle's angular momentum, (b) the torque acting on the particle, and (c) the rate at which the angular momentum is changing?
- A point particle travels in a straight line at constant speed, and the closest distance it comes to the origin of coordinates is a distance l. With respect to this origin, does the particle have nonzero angular momentum? As the particle moves along its straight-line path, does its angular momentum with respect to the origin change?A disk of M = 5kg, radius R = 3m is rotating %3D %3D counterclockwise about its center with an angular speed of wi = 3rad/s. 1m and mass 2 kg is %3D a) A thin hoop of radius R dropped on the disk so that it lands on the disk's surface and they share a center the angular speed of the pair %D after the collision? b) find the angular speed of the system if the hoop lands by the edge of the disk, so that the edge of the hoop is 0.5 m away from the center of the disk Overhead view a) b) 0.5mTrue or False: Net torque always equals moment of inertia times angular acceleration.
- Is the following statement true or false? Based on convention, a positive torque is the one that causes clockwise rotation; a negative torque is the one that causes counterclockwise rotation.A bicycle tire rotates. What is true about a point A near the center and a point B near the rim? Group of answer choices -Point B rotates with a faster angular velocity -they both rotate with the same angular velocity -they both rotate with the same tangential velocity -Point B rotates with a faster tangential velocityIn our class model, wind is flowing along the X axis and torque is generated in the Y axis, with torque measurements in the other axes being near 0. What would happen in reality if the torque in the X axis were large, even larger than in the Y axis? (select only one) The turbine would spin really fast and produce more energy O The turbine would not spin at all The wind could tip over the turbine O The turbine would spin backwards 1or hoth 2 a nd 2
- a) A diver leaps from a platform and immediately goes into a tuck position. If we assume that the diver has an initial angular velocity of 7.5 rad/sec, and has an angular acceleration of -0.22rad/sec2,how long will it take for the diver to complete 2 full revolutions?b) Assume that the diver is 6 m above the water with an initial vertical velocity of 1.74 m/s when she begins to rotate. Will she be able to complete 2 full revolutions before hitting the water? Why or why not?A 4.0-kg block starts from rest on the positive x axis 9.0 m from the origin and thereafter has an acceleration given a = 4.0 i- 3.0 j in m/s2. The torque, relative to the origin, acting on it at the end of 2.0 s is:Please help me