If the pressure (P) of an object that acts on a certain surface = (m g)/A . Where (m) is the mass of object, (g) is the acceleration due to gravity and (A) is basic area of the object. So the unit used for measuring the pressure in the British system is * kg/ foot. s^2
pound/ foot. s^2
g/ cm. s^2
pound. foot/ s2

Carbon is allowed to diffuse through a steel plate 15 mm thick. the concentrations of carbon at the two faces are 0.65 and 0.30 kg c/m^3 fe, which are maintained constant. if the preexponential and activation energy are 6.2 x 10-7 m2 /s and 80,000 j/mol, respectively, compute the temperature at which the diffusion flux is 1.43 x 10^-9 kg/m^2 -s.

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e

Ain is , is 's of ? 0.62 0.79 1.27 1.50