Since 1982, pennies have been made of a different metal and coated with copper plating. Using your data and the reference chart below, what metal do you predict
is on the interior of pennies minted after 1982?
Metal
Gold
Iron
Lead
Zinc
Mercury
Tin
Titanium
Silver
Platinum
Nickel
Density
(g/mL.)
19.32
7.86
11.34
7.13
13.55
7.3
4.5
10.5
21.45
8.9

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

answer; capital earns interest; entrepreneurship receives a profit or incurs a loss;

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.