With the same cross-sectional area and immersed in same turbulent flow, the largest total drag will be on A. a circular disc of plate held normal to flow B. a sphere C. a cylinder D. a streamlined body

The correct answer is A. a circular disc of plate held normal to flow.

A circular disc of plate held normal to flow will experience the largest total drag because it has the largest surface area exposed to the flow. The other options, a sphere, a cylinder, and a streamlined body, all have smaller surface areas exposed to the flow and will therefore experience less drag.

Drag is a force that opposes the motion of an object through a fluid. It is caused by the interaction of the fluid with the object’s surface. The amount of drag depends on the shape of the object, its speed through the fluid, and the density and viscosity of the fluid.

A circular disc of plate held normal to flow has a large surface area exposed to the flow. This means that there is a large amount of fluid interacting with the object’s surface. The fluid molecules that interact with the object’s surface will exert a force on the object. This force is in the opposite direction of the object’s motion and is called drag.

The other options, a sphere, a cylinder, and a streamlined body, all have smaller surface areas exposed to the flow. This means that there is less fluid interacting with the object’s surface. The fluid molecules that interact with the object’s surface will exert a smaller force on the object. This force is also in the opposite direction of the object’s motion, but it is smaller than the force exerted on the circular disc of plate held normal to flow.

Therefore, the circular disc of plate held normal to flow will experience the largest total drag.