physics multiple choice

Question

For a viscous fluid traveling through a pipe of radius r, the flow rate depends upon which of the following?

A. r³

B. r⁴

C. r

D. r²

Answer 1

Tare of Flow

volume flowing per second = A*V

where A = Cross- sectional area

and V = velocity of Liquid

A = pi* r²

So D is correct choice