Pergunta 5 you need to fill a football with air to play with it. you know that your pump expels air at speed of 8.2 ft/s. the needle of your pump has a radius of 4.5 millimeters. what is the volume flow rate of the air being pumped into the football?

The volume flow rate of the air being pumped into the football will be given by:
 Q=V*A
 Where
 V=Speed
 A=Area
 You know that your pump expels air at speed of 8.2 ft/s
 The area of The needle of your pump is
 A=pi*r^2=pi*((4.5/1000)*(3.28))^2=0.00068442 ft^2
 Finally
 Q=V*A=(8.2 ft/s)*(0.00068442ft^2)=0.005612243 ft^3/s

The length of what is left would be 1 1/2 feet long.