Free energy of a 2-state system physics. take the two states to have energies 0 and e a) find the free energy as a function of temperature b) from the free energy determine the energy and entropy. (c) determine the heat capacity (also known as the specific heat) at constant volume and sketch it as a function of temperature.

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.

conduct current i mean it makes sense