Answer:
The value is

The force will be outward
Step-by-step explanation:
From the question we are told that
The diameter of the disk is

The external pressure on Mars is
From the question we are told that
Internal pressure = External pressure
Generally the external Force on earth is

Here
is the atmospheric pressure with value

So

=>

=>

Generally the external Force on Mars is


=>

=>
Net force is mathematically represented as

=>

=>
converting to pounds

=>

Given that that the value is positive then the force will be outward