Chapter 4- College Physics, 7th Ed. (Sears/Zemansky/Young)

 

4 – 1.       30.3 N (right), 17.5 N (down)

4 – 2.       112 lb, 16°

4 – 3.       a) 32.3 N b) 16.2 N

4 – 4.       a) 8.11 N, 3.00N     b) 8.65 N                c) 12.6 N

4 – 5.       a) 0.306 kg             b) 118 N

4 – 6.       a) 0.188 slug          b) 28.8 lb

4 – 7.       4.59 kg; 17N

4 – 8.       a) the earth            b) 6N, the book     c) no       d) 6N, the earth, the book; upward

                e) 6N, the hand, the book; downward              f) first     g) third

                h) no       I) no        j) yes      k) yes     l) gravity of the earth           m) no

4 – 9.       a) gravity               b) gravity force of earth on bottle (downward) equal and opposite to gravity force of bottle on earth (upward)

4 – 10.     a) 3.06 kg               b) 800 N c) 0.483 m/s2

4 – 11.     1200N (270lb)

4 – 12.     a) 8.33 x 10-4 s        b) 1040N

4 – 13.     a) 11.7 ft/s2                   b) 583 ft                  c) 117 ft/s

4 – 14.     a) x = 8m; 3.2 m/s  b) x = 64 m; 6.4 m/s

4 – 15.     a) 8.44 kg               b) 160m

4 – 16.     a) (0.800 m/s3)t – (0.300 m/s5)t3           b) 0< t < 1.63 s

4 – 17.     a) 8 x 10 14 m/s2      b) 5 x 10-9 s            c) 7.29 x 10-16 N

4 – 18.     35.4 N, ± 135°

4 – 19.     46.6 N, at 90° clockwise from + x direction

4 – 20.     1230 N, 23° W of N

4 – 21.     a) 200N: + 173 N, + 100 N; 300N: - 212N, + 212 N; 155N: -93 N, –124 N

                b) 230N, 125°         c) 230N, 305°

4 – 22.     a) 5.2 m/s2              b) 13.3 m/s2

4 – 23.     1770 N (398 lb)

4 – 24.     a) 686 N                  b) 686 N                 c) 714 N                  d) 658 N

4 – 25.     a) 7.92 m/s             b) 52.3 m/s2, upward            c) 4970 N = 6.33w

4 – 26.     2.2m/s2

4 – 27.     0.150 N