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Grade: 10
        
An evacuated box is at rest on a frictionless table. You punch a small hole in one face so that air can enter. (See Fig.) How will the box move? What argument did you use to arrive at your answer?
5 years ago

Answers : (1)

Jitender Pal
askIITians Faculty
365 Points
							As the air molecules get into the box, they collide against its box and impart momentum to it. The upward momentum imparted by the air molecules get balanced by the downward momentum of the box, however due to the presence of hole, the same cannot take place for the vertical sides of box.
Therefore the momentum imparted by the air molecules to the left exceeds the momentum imparted towards the right, as a result the object start moving towards left with some speed.
5 years ago
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