Differents between foundamental quantity and derived quantities

Determine the change in width a, height b, thickness t when a plate is subjected to the uniform distributed load and is made of material having modulus of elasticity e=230 gpa and poisson's ratio ν=1/3. given : a=400 mm and b= 300 mm also the uniformly distributed load in downward y direction of plate is 2 mn/m and in the positive x direction is 3 mn/m and t=20 mm

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?

J. j. thomson’s experiment disproved the theory that an atom