Thursday, March 09, 2006

Physics 30-Chapter 5


Whew! Here are the answers to all of the homework for the chapter. Happy studying.


    1. 45 m/s2
    2. 3.9x104
    3. 3.1x103
    4. inertial mass
  2. 33.02 m/s2
  3. No, the acceleration during the first half-second was 45 m/s2 (problem 1) and the acceleration for the full time was 33.02 m/s2; 163.0 m/s
  4. –5x103, upward
  5. 3.1x103 N
  6. 6.3x103 N
  7. 33m

    1. 14 m/s
    2. 3.2x103 N
  9. 6.6x10-25
  10. –2.0 m/s2

    1. 95.0 kg
    2. 929 N
    3. 95.0 kg
    4. 934 N
    5. “mass in” (don’t worry, silly question)
  12. 250 kg
  13. 10.5 m/s2, down
  14. –1.13x104, opposite direction of motion
  15. 0.255
  16. 0.400
  17. –1 m/s2
  18. 5.3x104 N
  19. No, the grocery bag will rip.

    1. 1.2m/s2
    2. -0.63m/s2
    3. stopping, lower acceleration
    4. Scale reads less than 836N, reads 836N, then reads more than 836N
  21. 0.68 m/s2
  22. a
    1. 4.9x102N
    2. 150N, static friction
    3. 49N, sliding friction
    4. 2.0x102N
  23. a) 10N b) 0.20N
  24. 1.5m/s2
  25. 4.8m/s2

    1. 9.8 m/s2 up
    2. 98 m/s up
    3. –49N (down)
    4. 1.0x 10 s
  27. Will discuss in class
  28. a) 5.88 m/s2, b) 15.7 N
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