What is a typical constant for air resistance in relation to velocity?

[BigStelly]

Hey I am just wondering about something, air Resistance is proportional to the velocity in some cases or velocity squared in others.

dV/dt=kv what is a typical constant for k, i know it varies so let's just say a baseball at sea level(im sure you all can guess why I am asking this... ) Also is there a way to calculate this "k"...
any help greatly appreciated thanks!

 

[ramollari]

It depends very much on the shape and texture of objects, if you use the formula $$D = \frac{1}{2}CA\rho v^2$$. For a spherical body like the baseball it should be around 0.5.
Have a look here also: http://www.ac.wwu.edu/~vawter/PhysicsNet/Topics/Dynamics/Forces/DragCoeficientValues.html for a table of constants.

 

[Graeme Robinson]

The typical constant for air resistance, also known as drag coefficient, can vary depending on the object's shape, size, and surface properties. In general, it ranges from 0.1 to 1 for most objects moving through air. For a baseball at sea level, the drag coefficient would be around 0.3 to 0.4.

There are various methods to calculate the drag coefficient, such as wind tunnel experiments and computational fluid dynamics simulations. However, for a simple estimation, you can use the formula k = Fd/(1/2 * ρ * v^2 * A), where Fd is the drag force, ρ is the density of air, v is the velocity, and A is the cross-sectional area of the object. This will give you a rough estimate of the drag coefficient for a specific object at a given velocity.

I hope this helps and happy calculating!