Week 5

1.

  1) 1011 = 8+2+1 = 11

  2) 101010 = 32+8+2 = 42

  3) 11111 = 16+8+4+2+1 = 31

  4)10010 = 16+2 = 18

2.

  1) 31 = 16+8+4+2+1 = 11111

  2) 51 = 32+16+2+1 = 11011

  3) 7 = 4+2+1 = 111

  4) 103 = 64+32+4+2+1 = 110011

3.

  1) sec/56000kilobits = sec/7000bytes

      sec/7000bytes x 2^20byte/1MB x 100MB = 14980 sec

  2) sec/5megabits = sec/5000000bits = sec/625000byte

      sec/625000byte x 2^20byte/1MB x 100MB = 168 sec

  3) sec/10megabit = sec/10000000bit = sec/1250000byte

      sec/1250000byte x 2^20byte/1MB x 100MB = 84 sec

4.

  1) 3megabit/sec = 0.375MB/sec

     sec/0.375MB x 60MB = 160 sec for one MP3

    3600sec/160sec = 22.5 MP3