Physics 5 / History 177                                           Fall1997/ Spring 1998

The Nuclear Age: Its Physics and History

Profs. Gary R. Goldstein and Martin J. Sherwin


Exam 3 solutions


  1. Multiple choice

    1. c
    2. b
    3. e
    4. a
    5. c
    6. b
    7. e
    8. c
    9. c
    10. b

  2. Prob.2

    1. 1.7 Km/sec

    2. 5 min up and 5 min down

    3. d = gt2/2 = 440 Km

    4. vvertical = gt = 2.9 Km/sec

    5. distance/speed @ 2 m/3x103m/sec

  3. Prob.3

    1. 1.3x1016 Joules

    2. 8.1x1028 MeV

    3. 2.0x1027 fissions in 1 year

    4. 8.0x1025 90Sr nuclei in 1 year

    5. 1.7x106 Curies

    6. 52 bombs if pure fission, but H bombs are 1/2 fission, so 100 bombs is correct also

  4. Prob.4

    1. 40,000 per million people

    2. 80 million Cancer deaths

    3. 0.88 R/hr - still dangerous