Question

Pressure is said to be 1 pascal when a thrust of 1 N is applied on a surface area of 1m True or false
2-Foundations of high rise buildings are made narrow​ True or false​

Answer 1

Answer:

1. Pressure is said to be 1 pascal when a thrust of 1 N is applied on a surface area of 1m² - True
2. Foundations of high rise buildings are made narrow​ - False

Explanation:

   1. Pressure = Perpendicular force applied / Contact surface area

      If force = 1N    and     surface area = 1m² then;

       Pressure = 1N / 1m² = 1Nm-²

       1Nm-² = 1 pascal

        ∴Pressure = 1 Pascal

   2. Pressure always depends on the contact surface area and the perpendicular force applied. When contact surface area decreases, pressure also decreases. When contact surface area decreases, pressure increases. Meanwhile, when perpendicular force increases, pressure also increases and when force decreases, pressure also decreases.

          When it comes to high rise buildings, the weight of the building is high; Therefor a large perpendicular force is applied on the foundation. As mentioned above, this can cause a very high amount of pressure and if the foundation couldn't withstand that pressure, the building will collapse. So, the pressure applied by the building has to be reduced.

             How is it possible? It's mentioned above that, when contact surface area increases, pressure decreases. So if the area of the foundation is increased, we can reduce the pressure applied on it. In order to do that, foundations of high rise buildings are always made broadly.