A 20-kg chandelier is suspended from a ceiling by four vertical steel wires. Each wire has an unloaded length of 1 m1 \mathrm{~m}1 m and a diameter of 2 mm2 \mathrm{~mm}2 mm, and each bears an equal load. When the chandelier is hung, how far do the wires stretch?
Name the four regions of the spinal cord in order, starting from the brain stem.
According to IUPAC convention, what is the designation for the following group of elements?
Group IIIA
A(n) _______ constructor is one that requires no arguments.