Match the following vocabulary words with their definitions.
1. subsonic
the speed of an object traveling
below the speed of sound
sounds that humans can hear
2. supersonic
a phenomenon produced by the
3. audible
interference of waves at slightly different
frequencies
4. beats
the speed of an object traveling
above the speed of sound

Aplane travels 1000 miles in 5 hours .what is the planes average speed?

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.

Two forces produce equal torques on a door about the door hinge. the first force is applied at the midpoint of the door; the second force is applied at the doorknob. both forces are applied perpendicular to the door. which force has a greater magnitude?