Boyle's law for the expansion of gas PV=C.At a certain instant,the pressure is 2000 lb./ft², the volume is 8 ft³, and the volume increasing at the rate of 6 ft³/mm. Find the rate of change of the pressure at this time
P1V1 = P2V2
2000 * 8 = P2 * (8+6)
P2 = 1143 lb./ft2
Δ = 2000 – 1143 = 857 lb./ft2*mm
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