NFL footballs have a regulation pressure of 13.0 psi (pounds/square inch). On Ja
ID: 986772 • Letter: N
Question
NFL footballs have a regulation pressure of 13.0 psi (pounds/square inch). On January 24th 2015, footballs used by the New England Patriots in their playoff game against the Indianapolis Colts had been found to have lowered pressure. If 5 of the footballs were found to have pressures of 10.0 psi, what would be the amount of time necessary for a single person to deflate the balls from regulaton pressure, if he/she used a device that released 0.01 psi/sec (assuming no time lost going from one ball to the next and no pressure change occurring to the ball otherwise).
A. 1.5 x 10^3 min
B. 5.0 min
C. 25 min
D. 108 min
E. 83 min
Explanation / Answer
The pressure differnce = Pressure required- actual pressure = 13-10 =3
per sec 0.01Psi can only be delivered , time requied to reach the desired pressure for a single footbool= 3/0.01=300min
There are 5 foot balls and total required= 300*5=1500min (A is the correct answer)
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