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# Math 112 Solutions for 4.2, p. 329

2.
(b) . (c) . (d) . (f) .
3.
(a) about 1986 or 1987. (b) about 1983.
4.
; ;
5.
; ; hr; , so it takes hr to completely charge.
8.
; ; .
9.
10,506
12.
resistive force ; ; ; maximum is 60.
13.
as .
14.
; ; sec.
15.
(a) Since is inversely proportional to the square of the distance from the center of the earth, the acceleration on the object is .

(b) ; and , and the result follows.

(c) as , so that .

(d) and mi/sec.

21.
(a) i (b) iii (c) v (d) ii (e) iv

Jason Grout 2003-03-19