The pressure due to atmosphere is 1.0138 * 10 Pa.Find the force exerted by the atmosphere on the top surface of a table 2.0 m long and 1.0 m wide.

Well if you are talking about the earth's atmosphere then the standard value for earth's atmospheric pressure is 101.325 kPa or 1.01325 × 10⁵ Pa

So 

F = P × Area of the table 

and Area of the table  = lb = 2 m²

Now by substituting the values we can get the desired answer.