Chapter 3 – College Physics, 7th ed. Sears/Zemansky/Young

 

3 – 1        a) –2.04 m/s, +1.17 m/s        b) 2.36 m/s, 150°

3 – 2        a) 84 m, -116m       b) 143m

3 – 3        a) –3.5 m/s2, 8 m/s2               b) 8.73 m/s2, 114°

3 – 4        a) 8.3 m/s, 7.1 m/s b) 10.9 m/s, 40°

3 – 5        a) 0.452 s                b) 5.76 m/s             c) 7.26 m/s, 37.6° below horizontal

3 – 6        a) 0,0; 32 m, -4.9 m; 64 m, -19.6 m; 96m, -44.1m; 128m, -78.4m

                b) 32m/s in + x direction; 9.8 m/s2 in – y direction

                c) 32 m/s, -19.6 m/s; yes

3 – 7        a) 20.2s                   b) 3030m                c) 150 m/s, -198 m/s             

d) directly above where the box lands

3 – 8        a) 2.07 m b) 1.82 m                c) 2.8m/s, -6.37 m/s; 6.96 m/s, 66.3° below

3 – 9        a) 0.64 ft b) 5.76 ft

3 – 10      a) 1.53s                   b) 11.5 m                c) 3.06s; twice       d) 55.1m

3 – 11      a) 0.682 s, 7.48s     b) 30 m/s, 33.3 m/s; 30 m/s, -33.3 m/s               

c) 50 m/s at 53.1° below the horizontal

3 – 12      a) 118 ft/s               b) 54.1 ft

3 – 13      a) 1.04 m above ground       b) 0.668m above ground     c) arrow hits ground before reaching apple

3 – 14      a) 79 m                    b) 66.2 m/s             c) 405 m 

3 – 15      a) 5.4 m/s2 , upward              b) 10.5s

3 – 16      0.0337 m/s2

3 – 17      a) 2.97 x 104 m/s                    b) 5.92 x 10-3 m/s2

3 – 18      a) 471 m/s              b)  9.06 x 103 g

3 – 19      8.74 knots

3 – 20      a) 13.2° E of N       b) 282 km/hr

3 – 21      a) 3.35 m/s, 26.6° N of E       b) 333 s  c) 500 m

3 – 22      a) 30° S of E           b) 2.6 m/s               c) 385s

3 – 23      a) 5 m/s, 143°         b) 7.21 m/s, 124°

3 – 24      a) –5 m/s2, 8 m/s2; 9.43 m/s2, 122°      b) –15 m/s2, 8 m/s2; 17 m/s2, 152°

3 – 25      9.87 m/s

3 – 26      41.4 m

3 – 27      a) 145ft/s                b) 201 ft

3 – 28      a) 284 m/s              b) 1363m                c) 227 m/s, 229 m/s

3 – 29      a) 26.2 m/s             b) 17.1 m/s 40.1° below horizontal

3 – 30      a) 7.63 m b) no

3 – 31      ?

 

3 – 32


 

 

 


3 – 33      17.8 m/s

3 – 34      81.1 m east from drop point

3 – 35      91.1 km/hr relative to hero; 140 km/hr relative to earth

3 – 36      a) 0; 15 m/s, westward         b) 26 m/s, 30 m/s

3 – 37      a) 157 km/hr, 26.6° N of W  b) 68° W of N

3 – 38      26.3 km/hr, 52.5° N of E

3 – 39      ?

3 – 40      a) 40.8° above horizontal    b) 21.2° below horizontal

3 – 41      ?

3 – 42      a) 9.8 m/s               b) 1 s      c) 19.1 m