Question

A block that is 12 CM by 7 cm long and 9 CM tall is kept on a table top which of its surface will exert minimum pressure? if its weight is 6.3 Newton calculate the pressure in such

Answer 1

the block will exert minimum pressure if its surface of maximum area that is the surface of dimensions 12 CM * 9 CM is in contact with tabletop

As force on the tab=weight of the block=F=6.3N
surface area of the block,A=12cm*9cm
=12/100* 9/100
=108/10000m sq
pressure= F/A
= 6.3*10000/108
= 583.33 Pa

Answer 2

Suface 1                                 Surface 2                          Surface 3
Area= 12 x 7  = 84cm²            Area= 7 x 9 = 63cm²          Area= 12 x 9 = 108cm²
Force= 6.3N                           Force= 6.3N                       Force= 6.3N
Pressure(P₁)≈ 0.08N/cm²     Pressure(P₂)≈ 0.1N/cm²     P₃≈ 0.06N/cm²

                                                ∵ P₂ > P₁ > P₃

Suface 3 with dimensions 12cm by 9cm will exert the minimum pressure.