Identify the type of scientific knowledge represented by each statement.
law
theory
hypothesis
if a certain piece of metal is cooled,
it will conduct electricity better.
the amount of electric current that
passes through a conductor is directly
proportional to the voltage and is
sesenbed by the formular
electricity is the flow of electric charge
in the form of electrons moving through
a circuit.

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.