Abrick of dimensions (10×7×5) cm3 lying
on the ground exerts a force of 5 newton , find of what condition the brick exerts more pressure, in horizontally or vertically and how much ?

give me answer..plss

The 'b x h' side of the brick exerts more pressure on the ground, P =  1428.57 N/m²    

Explanation:

Given data,

The dimension of the brick, l = 10 cm = 0.1 m

                                              b = 7 cm = 0.07 m

                                              h = 5 cm = 0.05 m

The force exerted by the brick on ground, F = 5 N

The brick has three 2 x 3 sides, b x h, l x h, and l x b

The area of the side, A₁ = b x h

                                        = 0.07 x 0.05

                                         = 0.0035 m²

The area of the side, A₂ = l x h

                                         = 0.1 x 0.05

                                          = 0.005 m²

The area of the side, A₃   = 0.1 x 0.07

                                          = 0.007 m²

The pressure exerted by the surface A₁ on the ground, P₁ = F/A₁

                                                                                                 = 5 / 0.0035

                                                                                                  = 1428.57 N/m²

The pressure exerted by the surface A₁ on the ground, P₂ = F/A₂

                                                                                                  = 5 / 0.005

                                                                                                  = 1000 N/m²  

The pressure exerted by the surface A₁ on the ground, P₃ = F/A₃

                                                                                                 = 5 / 0.007

                                                                                                  = 714.29 N/m²  

Hence, the 'b x h' side of the brick exerts more pressure on the ground, P =  1428.57 N/m²                                                

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

i don't understand. explain it clearly