Hich statements are true regarding undefinable terms in geometry? select two options.

a point in the form (x, y) has two dimensions.
a plane has a definite beginning and end.
a line has one dimension, length.
a point consists of an infinite set of lines.
a plane consists of an infinite set of lines.

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.