The Pressure Inside a Commercial Airliner Is Maintained at 1

Multiple Choice

The pressure inside a commercial airliner is maintained at 1 ATM (1.01*105 N/m²) . What is the outward force exerted on a 1.0 m * 2.0 m cabin door if the outside pressure (at 10 km height) is 0.3 ATM?

A) 1.4*102 N
B) 1.4*103 N
C) 1.4 * 104 N
D) 1.4 * 105 N
E) 7.0 * 103 N