Question

Which of the following shapes would most likely have less drag if transition to a turbulent boundary layer could be made to occur earlier?

a). A javelin
b). A streamlined external fuel tank
c). A ball
d). A missile with a long, slender body and a flat base, like an AIM-120 AMRAAM

Answer 1

A streamlined external fuel tank would have the least drag when transitioning to a turbulent boundary layer earlier, thanks to its aerodynamic, sleek, and tapered design that reduces wake and pressure differences.

Step-by-step explanation:

When evaluating which shape would have less drag if the transition to a turbulent boundary layer could be made to occur earlier, it is essential to consider the shapes' aerodynamics. A shape that is sleek and tapered will usually experience less drag due to a smaller wake and a decreases pressure difference.

The streamlined external fuel tank, bobsleds, and automobiles mentioned are all carefully designed to minimize drag and maintain a streamlined shape similar to a bullet, emphasizing their aerodynamic features. In contrast, a sphere, such as a ball, as well as shapes with flat bases, generate larger wakes when transitioning to turbulence, leading to higher drag forces.

Therefore, among the options given, a streamlined external fuel tank would most likely experience the least drag if the transition to a turbulent boundary layer could be made to occur earlier. This is due to its streamlined design that allows it to cut through the air more easily, minimizing wake formation and pressure drag.