Answer from cs61c-fy (Vinayak Aggarwal 17797902) for Question 1
Physical addresses are provided directly by the machine.one physical address space per machine. addresses typically range from 0 to some maximum, though some portion if this space is used by the OS and is not available to the procesor.

virtual address are addresses provided to the processor by the OS. addresses typically start at zero, but not necessarily.space may consist of several segments.