38. An athlete swings a ball, connected to the end of a chain, in a horizontal circle. The athlete is able to rotate the ball at the rate of 8.00 rev/s when the length of the chain is 0.600 m. When he increases the length to 0.900 m, he is able to rotate the ball only 6.00 rev/s. (a) Which rate of rotation gives the greater speed for the ballP (b) What is the centripetal acceleration of the ball at 8.00 rev/s (c) What is the centripetal acceleration at 6.00 rev/s?

38. An athlete swings a ball, connected to the end of a chain, in a horizontal circle. The athlete is able to rotate the ball at the rate of 8.00 rev/s when the length of the chain is 0.600 m. When he increases the length to 0.900 m, he is able to rotate the ball only 6.00 rev/s. (a) Which rate of rotation gives the greater speed for the ballP (b) What is the centripetal acceleration of the ball at 8.00 rev/s (c) What is the centripetal acceleration at 6.00 rev/s?

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter4: Motion In Two And Three Dimensions

Section: Chapter Questions

Problem 64P: A runner taking part in the 200-m dash must run around the end of a track that has a circular arc...

See similar textbooks

Similar questions

An ice skater is preparing for a jump with turns and has his arms extended. His moment of inertia is 1.8kgm2 while his arms are extended, and he is spinning at 0.5 rev/s. If he launches himself into the air at 9.0 m/s at an angle of 45 with respect to the ice, how many revolutions can he execute while airborne if his moment of inertia in the air is 0.5kgm2 ?
Explain why centripetal acceleration changes the direction of velocity in circular motion but not its magnitude.
A runner taking part in the 200-m dash must run around the end of a track that has a circular arc with a radius of curvature of 30.0 m. The runner starts the race at a constant speed. If she completes the 200-m dash in 23.2s and rum at constant speed throughout the race, what is her centripetal acceleration as she runs the curved portion of the track?
What is the average speed in mi/h of a person at the equator as a result of the Earths rotation? (Take the radius of the Earth to be RE = 4000 mi.)
An automobile with 0.260 m radius tires travels 80,000 km beforewearing them out. How many revolutions do the tires make, neglectingany backing up and any change in radius due to wear?
An object with mass 125 g is in a circular motion. If the mangitude of the centripetal force is 18N amd the angular velocity is 23.2 rad/s, what is the radius of the circular path in the unit of meters?
An astronaut is being tested in a centrifuge. The centrifuge has a radius of 2 m and, in starting, rotates according to θ = 6t^2, where t is in seconds and θ is in radians. When t = 5 s, what are the magnitudes of the astronaut’s (a) tangential acceleration, and (b) radial acceleration?
A centrifuge in a forensic investigation laboratory rotates at an angular speed of 3,650 rev/min, clockwise (when viewed from above). When switched off, it rotates through 48.0 revolutions before coming to rest. Assuming it is constant, what is the magnitude of angular acceleration (in rad/s2)?
A 14.0 [cm] long test tube is placed in a centrifuge, oriented at 30.0º with respect to the vertical as shown. The centrifuge is then turned on, causing the test tube to undergo uniform circular motion at 6.50 × 10^3 [rpm]. What is the radial distance rC of the center of the test tube given that is has an acceleration of 2 347g (where g is acceleration due to gravity)?
From information on the endsheets of this book, compute, for a point located on the surface of the Earth atthe equator, the radial acceleration due to the rotationof the Earth about its axis.
A car, initially traveling at 17m/s has tires with a radius of 0.20m. If the brakes are capable of decelerating the rotation of the wheels at 25.5rad/s^2?, how long (in time, and distance) will it take for the car to come to a halt?
A cyclist On & circular track of radius r = 240 m is traveling at 8 m/s His speed in the tangential direction (i.e, the direction of his travel) increases at the rate of 1 m/s?. What Is most nearly the cyclist's total acceleration? (A) -0.9 m/s? (B) 0.7 m/s? (C) 0.9 m/s? (D) 1.0 m/s?