Eight equal drops of water are falling through air with a steady velocity of 10 cm s-1 If the drops combine to form a single drop big in size, then the terminal velocity of this big drop is ________________
volume of big drop= volume of all the single drops(n is the number of drops)
.: 4/3pi R^3 = n 4/3pi r^3
=>R= n^1/3 r
but terminal velocity is directly proportional to (radius)^2
=> V=n^2/3 v
answer is 40