SC.8.P.8.5 4. Kristin's teacher gave the students a formative assessment on the movement of particles in
solids, liquids, and gases. She projected the models shown below with the following 3 questions:
1. Which model shows particles of ocean water?
2. Which model shows particles of glaciers?
3. Which model shows particles of hot air?
B
A
How should Kristin answer the questions?
С
A. (1) A, (2) B. (3) C
B. (1) B, (2) C, (3) A
C. (1) C, (2) A, (3) B
D. (1) B, (2) A, (3) C
School Board of Broward County (Revised 8/27/2014)

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

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.

Ahair dryer is basically a duct in which a few layers of electric resistors are placed. a small fan pulls the air in and forces it through the resistors where it is heated. air enters a 1200 w hair dryer at 100 kpa and 22°c and leaves at 47°c. the cross-sectional area of the hair dryer at the exit is 60 cm2. neglecting the power consumed by the fan and the heat losses through the walls of the hair dryer, determine (a) the volume flow rate of air at the inlet and (b) the velocity of the air at the exit.