Question

2. For "sufficiently large" objects moving "sufficiently fast" through a fluid (i.e. for large Reynolds numbers), the drag force on the object is proportional to the square of its ve- locity (quadratic drag). In this limit, we can ignore viscosity and argue this dependence from kinetic considerations. (a) (2 points) Suppose a sphere of radius R moves with speed v through a fluid with mass density ρ. In a small time interval dt, what is the mass m of fluid that the sphere encounters?

Answer 1

2, spuise tavesa adis Ud t in time dt amd leng ftu watis