Question

A small paper ball is kept in the neck of a glass bottle held horizontally, it difficult to force ball into the bottle by blowing air into the bottle

Answer 1

Answer:

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Explanation:

when we blow air into the mouth of the bottle then the air in the neck of the bottle has high speed. the fast moving air reduces the air in the neck of the bottle. the air pressure inside the bottle being higher constantly pushes the paper ball and does not allow it to go inside the bottle.

Answer 2

When we blow air into the mouth of the bottle, the air near the mouth has higher speed.  The high-speed wind decreases the pressure there. Thus, the pressure inside the bottle is  higher than the pressure near the mouth. So, the air inside the bottle pushes the ball out.