CH. 3 -- 2, 8 , 12, 14, 18, 20,  36, 42, 58, 60 , 80;  #30, CHAPTER 9.  QUIZ 4

 2.
(a)- 45.6 m  and 58.8 m.

(b) 74.4 m.
8. SEE DISCUSSIONS
12. 1.29 m/s

14. MIN = 2.67 m/s

 MAX 4.67 m/s

 
18.

(a)  535 m and 1500 m

(b) 3140 m   and  8800 m
20

(a) -9.80 m/s2,  vertically downward.
(b)7.55 m s  and - 11.06 m/s . .
(c) 15 7 m
(d) The initial and final heights are not the same.
(e) y =1.81m .

.
36

(a) 5.0 m/s to the right

(b) 16.0 m/s to the left

(c) 13.0 m/s to the left.
42

(a) 28.4° , north of east.

(b) 3.7 m/s = speed of boat relative to Earth

(c) 216 s

 .

58.
(a)  15.5 degrees .
(b )  12.2 m/s

 
60
(a) 6.91 m  

(c) 7.9 m above the ground. The snowball passes well above the man and doesn’t hit him.
80

(a) The velocity of drop relative to Earth  is vertical and has zero horizontal component. The velocity of drop relative to train is 12.0 m/s westward.
(b) 20.8 m/sand 24.0 m/s
CH. 9 #30 (a) -50.0 rad s2   (b) 250 rad/s and 400 rad s. (c) 155 rev (d) 7.86 s