Question

Two drops of equal size are falling vertically through the air with a constant terminal velocity of 0.15 cm/s. What should be the velocity, if these drops coalesce to form one drop? 

Options

• 0.15 cm/s

• `0.15 sqrt2  "cm//s"`

• `0.15 xx 2^(1//3)  "cm//s"`

• `0.15 xx 2^(2//3)  "cm//s"`

Answer 1

`0.15 xx 2^(2//3)  "cm//s"`

Explanation:

For n = 2

v² = `"n"^(2//3) xx "v"_1 =2^(2//3) xx 0.15 "cm//s"`