已知:P=8820帕 s=0.02米2
求 F
F=PS=8820帕X0.02米2=176.4牛
已知:F=20牛+176.4牛=196.4牛 S=0.02米2
求 P
P=F/S= 196.4牛/0.02米2=9820帕