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  4. When a body falls in air, the resistance of air depends to a great extent on the shape of the body. Three different shapes are given. Identify the combination of air resistances which truly represents the physical situation? (The cross-sectional areas are the same).

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Q. When a body falls in air, the resistance of air depends to a great extent on the shape of the body. Three different shapes are given. Identify the combination of air resistances which truly represents the physical situation? (The cross-sectional areas are the same).Physics Question Image

AIIMSAIIMS 2007

Solution:

Figure $3$ is streamlined, so air resistance of it will be minimum. For figure $1$ surface area is maximum, so air resistance for it is maximum. Hence, correct sequence is $3<2<1$.