Answer:
7 rows of trees
If x equals the amount of rows...
8x = 56
Explanation:
8x = 56
(1/8) 8x = 56 (1/8)
x = 7
Air entering the potential space of the pleural cavity is called pneumothorax.
Answer: Mass of Air and natural frequency
Explanation:
When you pour liquid in a tall, narrow glass. You may hear a sound with slowly rising pitch. This is due to the fact when you add liquid in a glass the volume of the liquid in glass increases and the volume of air in the glass decreases. This volume of air has a mass and this is the reason for producing the sound of pitch in the glass. Now as the volume and in turn mass of air is being reduced it results in slowly increasing the pitch as the glass is filled by the liquid.
Another point to consider is due to result of changing of the resonance of glass. As the liquid is filled the natural frequency at which the glass resonates also changes due to disturbance being produced in the glass. As a result the pitch steadily keeps on increasing as the glass resonance is amplified on the natural frequency and other frequencies are erased.