when spinning a ice skater abducts her arms to slow her spinning. From a mechanics point of view, why does abducting her arms slow her spinning?

In 2015, in Warsaw, Poland, Olivia Oliver of Nova Scotia broke the world record for being the fastest spinner on ice skates. She achieved a record 342 rev/min, beating the existing Guinness World Record by 34 rotations. If an ice skater extends her arms at that rotation rate, what would be her new rotation rate? Assume she can be approximated by a 45-kg rod that is 1.7 m tall with a radius of 15 cm in the record spin.With her arms stretched take the approximation of a rod of length 130 cm with 10% of her body mass aligned perpendicular to the spin axis. Neglect frictional forces.

7:31 l LTE 1 Safari A student whirls a stopper tied to the end of a string in a horizontal circle of radius, r, for ten complete revolutions. Which of the following diagrams best represents the directions of the velocity and the acceleration of the stopper at the instant that it is at position A, as shown? A) C) B) D) A ball on the end of a string is being swung in a vertical circle, rotating clockwise as shown in the diagram. Position I is at the top of the position III is at the tom of the circle. II III Rank the magnitudes of the centripetal force exerted on the ball at locations I, II, and II. A) I>II> III B) II>I- I C) III > II > D) I-II- III If the string were suddenly cut when the ball is at position II as shown in the figure, the subsequent motion of the ball would be A) To move to the right B) To move to the left C) To move to the top of the page D) To move down and to the right A 30-kg child sits on the edge of a merry-go-round. The child is located 6 m from the center of the…

An LP record rotates at 33.33 revs/min. A penny is placed flat on the record a distance 8cm from the center of the record. The coefficient of static friction between the record and the penny is ?​s.​ If the penny does not slide on the record, what is the minimum value of ?​s ?​

Please solve and answer the question correctly. Thank you!!

The planet earth orbits around the sun and also spins around its own axis Part a: calculate the momentum of the earth in its orbit around sun in kg* m^/s Part b: calculate the angukae momentum of the eart spinning on it axis kg *m^2/s Part c : how many times larges is the angular momentum of the earth in its orbit than the angular momentum of the earth around axis?