ten base 5 is a coaxial type of cable. cant think of an example of how it's used in today's networks.
ten base t is twisted pair cat5 ethernet cabling, but only transmits 10Mbit/s.
no. 5 is the range. 10 is the 10 mbps, T means Twisted Pair, and 5 means 500 meters. 500 meters is the maximum effective length of the cable before it starts to loose packets.
btw the "base" in 10baseT means that it is used in baseband networks instead of broadband.