Chapter 8 – College Physics, 7th edition (Sears, Zemansky, Young)

 

8 – 1.       a) 3 x 105 kg*m/s                   b) 60 m/s; 42.4 m/s

8 – 2.       a) 18 m/s, to right                 b) 6 m/s, to left

8 – 3.       a) –1 x 106 m/s2                      b) –5 x 103 N                          c) 4 x 10-4 s

8 – 4.       a) 18 kg*m/s; 18 N*s           b) 9000 N

8 – 5.       5.48 x 103 N; 1.72 x 103 N

8 – 6.       2.67 x 103 N; no

8 –7.        a) 7.8 m/s               b) –16.2 J

8 – 8.       0.15 m/s, opposite to ball

8 – 9.       a) 0.0746 m/s         b) 0.15 m/s

8 – 10.     a) 4 m/s, east         b) 5 m/s, east         c) 2.33 m/s, east

8 – 11.     a) 3.4 m/s, in Gretzky’s direction        b) –6790 J

8 – 12.     a) 1.8 m/s               b) 2.43 J

8 – 13.     2.73 m/s

8 – 14.     1.35 m/s

8 – 15.     a) A: 14.6 m/s; B: 10.4 m/s   b) 19.6%

8 – 16.     a) 0.100 m/s, 53.1° below x-axis in the fourth quadrant                  b) –0.0015 J

8 – 17.     a) 1.67 m/s             b) 8.33 x 104 J         c) 2.5 m/s

8 – 18.     a) 0.273 m/s, to the right      b) 46.1 J 

8 – 19.     a) 15m/s                 b) 25%

8 – 20.     1.48 m/s

8 – 21.     257 m/s

8 – 22.     21.3 km/hr, 38.7° N of E

8 – 23.     a) 0.0732 m             b) 1800 J c) 3.59J

8 – 24.     10g marble: 0.35 m/s, to the left          b) 30g marble: 0.15 m/s, to the right

8 – 25.     0.3 kg block: 0.84 m/s, to the left; 0.2 kg block: 0.96 m/s, to the right

8 – 26.     ?

8 – 27.     4.6 x 106 m from the center of the earth

8 – 28.     (-1.44m, 1.11 m)

8 – 29.     a) 20 m in front of the 1000 kg auto                   b) 7 x 104 kg*m/s                  c) 23.3 m/s            

d) 7 x 104 kg*m/s

8 – 30.     a) 200 N                  b) yes

8 – 31.     75 kg

8 – 32.     4000 m/s

8 – 33.     12N

8 – 34.     a)  1.42 N*s           b) 944 N

8 – 35.     2.75 m/s; 0.866 m/s

8 – 36.     a) –2.4 N*s; 1 N*s               b) –29 m/s, 14.6 m/s

8 – 37.     244 m/s

8 – 38.     11.9 m/s, 24.5 m/s

8 – 39.     a) 0.653                   b) 480 J                   c) 1.28 J

8 – 40.     a) 1.22 m/s             b) 122 m/s

8 – 41.     a) 0.160 m/s           b) 0.15 kg

8 – 42.     20

8 – 43.     a) mAvA/mB

8 – 44.     a) 14.6 m/s, 31° from original direction of bullet              b) no, D K = -189 J

8 – 45.     ?

8 – 46.     a) vA ~ v, vB ~ 2v                  b) vA = v/3, vB = 4v/3           c) vA = -v/3, vB = 2v/3

8 – 47.     0.885 m/s, to the left

8 – 48.     a) 0.0894 Ko           b) 0.326 Ko

8 – 49.     2.91 m

8 – 50.     0.106 m from midpoint

8 – 51.     0.3 m/s

8 – 52.     4.5 m, toward James

8 – 53.     ?

8 – 54.     A: 17.3 m/s; B: 10 m/s, 60°

8 – 55.     1.74 x 106 m/s; 7.4 x 105 m/s; vKr = 1.53vBa

8 – 56.     0.546 m

8 – 57.     a) 3390 m                b) 6.4 x 104 J

8 – 58.     a) vA1mA/(mA + mB)               b) yes     c) uA1 = uA1mB/(mA + mB); uB1 = -vA1mA/(mA + mB)          

d) uA2 = -uA1, uB2 = -uB1; 0                   e ) A: -1 m/s; B: 2 m/s, yes

8 – 59.     b) ½ MV2