Answer from cs61c-ek (jin Tang li 15994133) for Question 1
physical address 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 teh OS and is available to the procesor. virtual address are address are addresses provided to the processor by the OS. addresses typically start at zero, but not necessarily. space my consist of several segments.