The velocity of flow of a liquid through a pipe at a point of radius r is v. At a point where the radius is 2r, the mass of the liquid flowing out per second is (d = density of the liquid)

The velocity of flow of a liquid through a pipe at a point of radius r

1.	The velocity of flow of a liquid through a pipe at a point of radius r is v. At a point where the radius is 2r, the mass of the liquid flowing out per second is (d = density of the liquid)
Answer» `2pi R^(2) "vd"` `4pir^(2) "vd"` `pir^(2) "vd"` `(pir^(2) "vd")/( 4)` ANSWER :C