Final answer:
The velocity of the air cannot be determined without knowing the flow rate.
Step-by-step explanation:
The velocity of the air can be found using the equation:
v = Q / A
Where v is the velocity, Q is the flow rate, and A is the cross-sectional area of the pipe.
In this case, the diameter of the pipe is given as 4 inches, which is equivalent to 10.16 cm. We can calculate the cross-sectional area using the formula:
A = pi * r2
Where r is the radius of the pipe, which is half the diameter.
Substituting the values, we get:
A = pi * (10.16 / 2)2
Now we can solve for v using the flow rate, which is not provided in the question. Therefore, we cannot determine the velocity without knowing the flow rate.