Question

Air drag exerts a force f on a solid sphere of radius R moving through air. it is known that f is proportional to air density, area of cross section of the spear and the square of the speed of the sphere. 2 sphere 1 and 2 made of the same material but with the respective radii R and 4R fall through air to attain respective terminal speed U and V the ratio of v by u is​

Answer 1

Answer:

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Explanation:

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