While dangling a hairdryer by its cord, you observe that the cord is vertical when the hairdryer is off and, once it is turned on, the hairdryer moves to the right and comes to rest when the cord makes an angle of 5o with the vertical, as shown below. In a different experiment, you determine that the same hairdryer is pushing 0.06 m3 of air through itself every two seconds. The mass of the hairdryer is 420 g. Determine the speed of the air leaving the hairdryer, vair. Assume that the mass of 1 m3 air is 1.2 kg and that the hairdryer is blowing air perpendicular to the wire.

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.