Pressure is determined as force per unit area of the surface. The SI unit of pressure, pascal is as shown below :
'IPa=INm^(-2)'
If mass of air at sea level is 1034 'g cm^(-2)', calculate the pressure in pascal.

Density of a unit cell is the same as the density of the substance. So, if the density of the substance is known, we can calculate the number of atoms or dimensions of the unit cell. The density of the unit cell is related to its formula mass (M), number of atoms per unit cell (z), edge length (a in cm), and Avogadro's constant N_(A) , as rho=(zxxM)/(a^(3)xxN_(A)) Q. A metal A (atomic mass=60) has a body-centred cubic crystal structure. the density of the metal is 4.2 g cm^(-3) . the volume of unit cell is

Work is related to force and displacement over which it acts. A body of mass 1 kg travels in a straight line with a velocity kx^(3//2) where k = 5 SI units. (Calculate the work done by the net force to displace from x= 0 to x= 2m .