A box has the weight of 120N and the bottom of the box is 12 cm² what is the pressure the box exerts on the floor

Given parameters

Weight of the box = 120N

Area of the box = 12cm^2

Unknown

Pressure of the box on the floor = ?

Solution

Pressure is the fore exerted by a body per uint area

Pressure = force/area

We need to convert the area into m^2 from cm^2

10000cm^2 = 1m^2

12cm^2 = 12/1000 = 0.0012m^2

Pressure = 120/0.0012 = 100000N/m^2

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.