Question

A room has a volume of 160 m3. An air-conditioning system is to replace the air in this room every 21.3 minutes, using ducts that have a square cross section. Assuming that air can be treated as an incompressible fluid, find the length of a side of the square if the air speed within the ducts is (a) 3.00 m/s and (b) 6.00 m/s.

Answer 1

Answer:

A. 0.204203928 m

b. 0.1443939822

Explanation:

Givens:

Volume (V) = 160 m^3

velocity 1 (v1) = 3.00 m/s

velocity 2 (v2) = 6.00 m/s

Time (t) = 21.3 minutes = 1278 seconds

Side length = ?

V = A*v*t

A = s^2

V = s^2*v*t

s= $\sqrt{\frac{V}{v*t} }$

A.

s = $\sqrt{\frac{V}{v*t} }$ = $\sqrt{\frac{160}{3.00*1278} }$ = 0.204203928 m

B.

s = $\sqrt{\frac{V}{v*t} }$ = $\sqrt{\frac{160}{6.00*1278} }$ = 0.1443939822 m

I hope this helped!! Have a good day.