A nice example of the difference that drag can make concerns raindrops. Consider a raindrop that has a radius of 2 mm and falls from a height of 1000 m. Further, let us approximate the raindrop as a smooth sphere.The density of water is 1 g/cm3. In real life, the raindrop experiences a considerable drag force. When the drag force is considered, approximately how fast will the raindrop be travelling when it strikes the ground?
For solving this problem, write the expression for the velocity of the drop under drag action and then substitute the values in standard international units.

A nice example of the difference that drag can make concerns raindrops. Consider a raindrop that...
10. Write a one-page summary of the attached paper? INTRODUCTION Many problems can develop in activated sludge operation that adversely affect effluent quality with origins in the engineering, hydraulic and microbiological components of the process. The real "heart" of the activated sludge system is the development and maintenance of a mixed microbial culture (activated sludge) that treats wastewater and which can be managed. One definition of a wastewater treatment plant operator is a "bug farmer", one who controls the aeration...