People in all walks of life use nasal strips, or external nasal dilator strips (

Question

People in all walks of life use nasal strips, or external nasal dilator strips (ENDS), to alleviate a number of respiratory problems. First introduced to eliminate snoring, they are now finding use in a number of other areas. For example, dentists have found that nasal strips help patients breathe better during dental procedures, making the experience considerably more pleasant for both doctor and patient.

One of the great advantages of ENDS is that no drugs are involved; the strips are a purely mechanical device, consisting of two flat, polyester springs enclosed by an adhesive tape covering. When applied to the nose, they exert an outward force that enlarges the nasal passages and reduces the resistance to air flow (see the illustration in (Figure 1) ). The mechanism shown in (Figure 2) is used to measure the behavior of these strips. For example, if a 30-g weight is placed on the movable platform (of negligible mass), the strip is found to compress from an initial length of 50 mm to a reduced length of 19 mm, as can be seen in (Figure 3) .

In use on a typical human nose, the end-to-end distance is measured to be 30 mm. What force does the strip exert on the nasal passages in this situation?

In use on a typical human nose, the end-to-end distance is measured to be 30 . What force does the strip exert on the nasal passages in this situation?

Explanation / Answer

for end to end distance of 30mm, the corresponding force needed to be applied is close to 24 gm per figure 3.

Therefore, force applied = 0.024*acceleration due to gravity = 0.024*9.8 = 0.23 N

Third option is correct

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