The si units for acceleration are km/h
fill in the blank to complete each statement.
7. the rate at which the velocity of an object changes is the object's rate of
8. an airplane is accelerating at 8 m/s2. each second its speed increases by
m/s
9. an airplane is accelerating at 8 m/s. the distance the airplane travels each second is!
than the distance it traveled during the previous second
10. an amusement park ride falls straight down for 4 seconds. during this time, the ride
accelerates from a speed of 0 m/s to 40 m/s. the ride's rate of acceleration during the
4 seconds is
m/s?

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.