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