The pressure is 1.0×10 6 Pa and the pressure is 2.0×10 6 N.

Test question analysis: (1) The pressure on the thin iron sheet:

p=ρgh=1.0×10 3 kg/m 3 ×10N/ kg×100m=1.0×10 6 Pa;

(2) The pressure on the thin iron sheet:

F=pS=1.0×10 6 Pa×2m 2 =2.0×10 6N.

Answer: The pressure of seawater on the submarine hatch cover is 1.0×10 6 Pa and the pressure is 2.0×10 6 N.

Comments: (1) It is known that the depth of the thin iron sheet under the sea surface and the density of seawater are known, and the pressure is calculated using the formula p = ρgh;

(2) It is known that The pressure and area of ??the thin iron sheet are calculated using the formula F=pS.