In which of the following situations does fluid friction exist?​A box placed on a floor in a vacuum chamber​A missile fired to destroy enemy tanksA satellite revolving around the planet Mars​A maglev train moving at a high speed

Fluid friction, also known as drag, occurs when a solid object moves through a fluid or when a fluid moves across a solid surface. It is the resistance to an object's motion through a fluid.

1. A box placed on a floor in a vacuum chamber: In this situation, there is no fluid (air or liquid) present to create fluid friction. The box is in a vacuum, which means there are no air molecules to create resistance. So, fluid friction does not exist in this situation.

2. A missile fired to destroy enemy tanks: When a missile is fired, it moves through the air. Air, being a fluid, creates resistance to the missile's motion. This resistance is fluid friction. So, fluid friction does exist in this situation.