# The Physics Of Space Shuttle Essay

Space is everything, discovered known places, and also the dangerous unknown. However, when astronauts and cosmonauts return to Earth from space, it take a lot of hard work to return safely. The first step to reentry is knowing how drag and gravity will affect the flight. The astronomers and astronauts use an equation to show drag on the ship reentering the atmosphere. The equation is: Fdrag=12V2CDA. In this equation, ρ, represents the density of the air at which the ship is entering (kg/m3), V, is the ship’s velocity (speed) (m/s), CD represents the drag coefficient, which will be discussed later, and, A, represents the surface exposed to wind. To understand the equation, one has to understand what each part of the equation means. The drag coefficient applies to the shape of the ship and how streamlined the shape is. A streamlined shape that is commonly used for leaving the atmosphere is the cone shape. The problem with the cone when reentering the atmosphere is the friction with the air. On a cone shape, as the point of the shape speeds toward Earth, the air friction is…