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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. 3 different shapes are given. Identify the combination of air resistances which truly represents the physical situation. (The cross sectional areas are the same) <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/63f9992042449a252215e5020abde9bb-.png /> 1. Disc 2. Ball 3. cigar sheped

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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. $3$ different shapes are given. Identify the combination of air resistances which truly represents the physical situation. (The cross sectional areas are the same)
image
1. Disc
2. Ball
3. cigar sheped

KCETKCET 2005Mechanical Properties of Fluids

Solution:

Fig. 3 is stream lined, so air resistance for it will be minimum. For fig. 1 surface area is maximum, so air resistance for it is maximum. Hence, correct sequence is $3<2<1$.