- #1

Victor Holomon

- 6

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https://www.grc.nasa.gov/WWW/k-12/VirtualAero/BottleRocket/airplane/rktvrecv.html

https://www.grc.nasa.gov/www/k-12/airplane/dragco.html

http://www.engineeringtoolbox.com/drag-coefficient-d_627.html

The drag coefficient can be calculated with equation(s) shown on the websites. The drag coefficient can be calculated with a velocity as one of the variables, as the velocity changes then the drag coefficient would change too (right?). From my current understanding the velocity is how fast the object/parachute is traveling in the medium (assuming terminal velocity). But the velocity which the parachute is traveling through the medium depends on other factors such as mass (am I right?).

However these websites below tells me that no matter what size or mass these objects have, the drag coefficient would remain the same/relative to the corresponding forms/shapes of the object:

https://www.grc.nasa.gov/www/k-12/airplane/shaped.html

https://en.wikipedia.org/wiki/Drag_coefficient

http://www.aerospaceweb.org/question/aerodynamics/q0231.shtml

Wouldn’t the mass or size of these objects change the velocity which they travel through the medium? Thus changing the drag coefficient according to the equation? I am very confused.