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).

Question

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). (A) 1 < 2 < 3 (B) 2 < 3 < 1 (C) 3 < 2 < 1 (D) 3 < 1 < 2

Tardigrade Admin · Accepted Answer

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.

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).

1 < 2 < 3

2 < 3 < 1

3 < 2 < 1

3 < 1 < 2

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 $3 < 2 < 1$ .