## Question:

The fan draws air through a vent with speed v. If the cross-sectional area of the vent is A, determine the horizontal thrust on the blade. The specific weight of the air is ${ γ }_{ a }$. Given: v = 12 ft/s , A = 2 ${ ft }^{ 2 }$ , ${ γ }_{ a }$ = 0.076 lb/${ ft }^{ 3 }$ , g = ${ 32.2ft/s }^{ 2 }$