pressure on solids

pressure on solids
 
the greater the force of body weight, the greater the pressure it creates
the smaller the gravity object, the smaller the pressure generated
the smaller the broad field of press, the greater the pressure it creates
greater basal area press, the less pressure caused
so the pressure is directly proportional to the force exerted and inversely with the area to which the force field 

If each block has the same weight, at 27 N, beams Which gives greater emphasis to the floor?

 

discussion:

I beams

A = 30 cm x 10 cm = 300 cm ² = 0.03 m²
F = 27 N
P =  F

       A

P = 27 N   

     0,03m²

P = 900 Pascal

II beams

A = 20 cm x 10 cm = 200 cm² = 0,02 m²

 P =  F

       A

P = 27 N   

     0,02m²

P = 1350 Pascal

problems :

A block of mass 300 kg with a sides 20 cm.

Determine the pressure at the base of the beam when the beam is placed on the table at the position as shown in the image above!