Example 1.2 If your heart rate is 150 beats per minute during strenuous exercise, what is the time per
beat in units of seconds?
Solution

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

Phase changes are chemical changes. true or false

Figure 9 on page 362 shows various motions of balls. the curved path followed by the yellow ball in b in picture b is result of a) inertia b) centripetal motion c) gravity and horizontal velocity d) linear motion