What is the formula for velocity and time taken of object falling in water

malek340

What is the formula of the velocity and time taken of an object faling in water? I have the mass, the density, the volume of the object and the height distance of the falling object. I know that the drag force is included in the formula but i have idea how to calculate it. So anyone knows this?

arildno

Well, Stoke's law of resistance is the simplest approximation, and in many cases good enough.
In full generality, the problem does not have any simple answer.
Look at the subsection concerning Stokes drag:
http://en.wikipedia.org/wiki/Drag_%28physics%29

Rorkster2

i read about how a kid about 15 years old just cracked (within a month or 2 ago) the math behind objects falling with air resistance. id imagine its related to that although it would need to be tweeked, and its doubtful thats been done yet

sophiecentaur

I seem to remember a story that Stoke managed to get his formula whilst sitting a Physics exam in which the Professors had put the 'unanswerable' question of a sphere falling through a fluid, just to give students a hard time. (Ah, those were the days!)
His correct answer caused quite a stir.

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malek340	What is the formula for velocity and time taken of object falling in water Tweet What is the formula of the velocity and time taken of an object faling in water? I have the mass, the density, the volume of the object and the height distance of the falling object. I know that the drag force is included in the formula but i have idea how to calculate it. So anyone knows this?

arildno Recognitions: Gold Member Homework Help Science Advisor	Well, Stoke's law of resistance is the simplest approximation, and in many cases good enough. In full generality, the problem does not have any simple answer. Look at the subsection concerning Stokes drag: http://en.wikipedia.org/wiki/Drag_%28physics%29

Rorkster2	i read about how a kid about 15 years old just cracked (within a month or 2 ago) the math behind objects falling with air resistance. id imagine its related to that although it would need to be tweeked, and its doubtful thats been done yet

sophiecentaur Recognitions: Gold Member Science Advisor	What is the formula for velocity and time taken of object falling in water I seem to remember a story that Stoke managed to get his formula whilst sitting a Physics exam in which the Professors had put the 'unanswerable' question of a sphere falling through a fluid, just to give students a hard time. (Ah, those were the days!) His correct answer caused quite a stir.