A skater spins about a fixed point on the ice. She begins with her arms extended and aninitial angular velocity wo. She then pulls her arms in to her body. After her arms arepulled to her body, she spins with an angular velocity final ,wf . Throughout the time sheis spinning, no external forces are acting in the horizontal plane.How do the magnitudes of the initial and final angular velocities compare?OA.Wo > WfOB.WO = wfw0 < wfOE.ооо оо

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Answered: A skater spins about a fixed point on…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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page A golfers clubs' linear tangential velocity at contact with the ball on the tee was recorded as 35.6 m/s. Given the distance from the club head to the golfers centre of rotation as 1.35 m calculate the angular velocity (radians/s) of rotation at the point of contact to 2 decimal places. Answer: ere to search B R Bi 5 T 6 B H 9 Pa O Finish attempt P 6°C Light ra
A figure skater performs a twisting jump. She rotates around her longitudinal axis 2 times in 0.65 s. What was her angular displacement in radians? A 4 В D 720 E 2m
An electric ceiling fan is rotating about a fixed axis with an initial angular velocity magnitude of 2.00 rad/s . The magnitude of the angular acceleration is 0.5 rad/s2 . Both the angular velocity and angular acceleration are directed clockwise. The electric ceiling fan blades form a circle of diameter 0.50 m. A) How long does it take for the angular velocity to reach 4 rad/s? B) What angle do the blades turn through in that time?
A golfer is hitting a shot, the angular velocity of her club is zero at the top of the backswing and 30 rad/s at the bottom of the downswing just before impact with the ball. If the downswing lasts 0.30 s, what is the average angular acceleration of the club during the downswing? A. 100 rad/s^2 B. 10 rad/s^2 C. 100 deg/s^2 D. 30 rad/s^2 pick one answer only this is for biomechanics
4. 00 10 cm MA = 100 g m² = 100 g mc = 200 g mp = 200 g The four masses are connected by massless rigid sticks. a.) Locate the center of mass. b.) The object rotates about an axis that passes through the center of mass and is parallel to the z-axis. The constant angular velocity is w = 8 rad/s. Calculate the total kinetic energy of this system.
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A clock hangs on a wall. a) What is the direction of the average angular velocity of the seconds hand? b) What is the magnitude of the average angular velocity of the seconds hand?
A person sits in a chair that is free to rotate without friction. Intheir hands, they hold two masses: Mass m1 = 5.0 kg a distance r1 = 0.35m from their body and mass m2 = 3.0 kg a distance r2 = 0.75 m from their body. a. At what distance r1 should the person hold mass m1 if they want to change their rotation speed from w1 = 8.0 rad/s to wf = 5.0 rad/s? b. What is the new moment of inertia about the vertical axis when m1 is held at this new distance?
The force of F = (2i -5j) N is acting on a particle whose position vector is r = (i +0.5j +2k) m Calculate the torque vector about the origin in Nm (Hint: consider the vector product) a. 8 b. 10i +4j - 6k c. 2i-2.5J d. (-1k) e. O f. (k) Nm 2i -2.5j +2k
2.5 3. A playground merry-go-round of radius 1.5 meters. The child applies a constant force of F, =50 Newtons to the rim. There is a frictional torque of 35 Nm opposing the rotation. The graph shows a plot of the resulting angular velocity of the merry-go-round as a function of time. 2 1.5 0.5 Fo view from above time (s) a. What is the torque due to the force F, (take ccw as positive)? b. What is the moment of inertia of the merry-go-round? @ (rad/sec)
A yo‑yo with a mass of 0.0850 kg and a rolling radius of r=1.60 cm rolls down a string with a linear acceleration of 5.20 m/s2. Calculate the tension magnitude ? in the string and the angular acceleration magnitude ? of the yo‑yo.
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