The density of the earth is given by p=3g/4rG where"p" is the density "G" is the gravitational constant 'r' is the radius of the earth and 'g' is the acceleration due to gravity. Show that the relations are correct on the basis of dimensional analysis .

Which of the following best describes internal energy? a. the difference between the kinetic and potential energies of the particles in a system b. the sum of the kinetic and potential energies of the particles in a system c. the sum of the kinetic and thermal energies of the particles in a system d. the difference between the kinetic and thermal energies of the particles in a system