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SOLUTIONS MANUAL
2-1
CHAPTER 2
The correspondence between the problem set in this first edition versus the problem set in the 5`th edition text. Problems that are new are marked new and those that are only slightly altered are marked as modified (mod). New 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Old 1 2 new 3 5 6 7 new 9 10 11 12 new new new 13 new 14 new 16 New 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Old new 18 19 15 new 20 21 new new 23 24 new new 26 27 new 28mod 29 30 31 New 41 42 43 44 Old new 32 34 35
2-2 2.1 The ¡°standard¡± acceleration (at sea level and 45¡Æ latitude) due to gravity is 9.80665 m/s2. What is the force needed to hold a mass of 2 kg at rest in this gravitational field ? How much mass can a force of 1 N support ? Solution: ma = 0 = F = mg = 2 F = mg F = F - mg 9.80665 = 19.613 N => m F g
m = F/g = 1 / 9.80665 = 0.102 kg
2.2
A model car rolls down an incline with a slope so the gravitational ¡°pull¡± in the direction¡¦(»ý·«)