Avector changes if
1. any of these
2. its direction changes.
3. its direction and magnitude both change.
4. its magnitude changes.
5. none of these

What is a good example of instantaneous speed

Review multiple-concept example 7 in this chapter as an aid in solving this problem. in a fast-pitch softball game the pitcher is impressive to watch, as she delivers a pitch by rapidly whirling her arm around so that the ball in her hand moves in a circle. in one instance, the radius of the circle is 0.626 m. at one point on this circle, the ball has an angular acceleration of 66.1 rad/s2 and an angular speed of 12.6 rad/s. (a) find the magnitude of the total acceleration (centripetal plus tangential) of the ball. (b) determine the angle of the total acceleration relative to the radial direction.

Robin is swinging back and forth from a trapeze. in which of the following situations is his kinetic energy being transformed into potential energy