# College Physics 8th Edition by Serway and Vuille Answers to ```College Physics 8th Edition by Serway and Vuille
Chapter 15
Problem 5
a) F = 36.9 N
b) a = 5.52 &times; 1027 m/s2
Problem 7
F = 5.07 &times; 105 N
Problem 9
a) F = 2.16 &times; 10−5 N (attract)
b) F = 8.99 &times; 10−7 N (repel)
Problem 13
F = 0.437 N
φ = −85.3◦ (Downward and to the right)
Problem 15
q = 7.22 &times; 10−9 C = 7.22 nC
Problem 19
E = 7.20 &times; 105 N/C
Problem 23
a) a = 6.13 &times; 1010 m/s2
b) t = 1.96 &times; 10−5 s = 19.6 &micro;s
c) d = 11.8 m
d) KE = 1.2 &times; 10−15 J
Problem 26
x = 0.853 m
Problem 32
Problem 38
r = 5.15 &times; 10−7 m = 0.515 &micro;m
Problem 42
a) q = 3.38 &times; 10−9 C
b) You only know that the charge is distributed spherically symmetrically within the sphere.
Problem 47
a) E = −8 N/C
b) E = 0 N/C
c) E = 1.44 N/C
d) 2 nC on the inside surface and 1 nC on the outside surface of the sphere
Problem 52
q = 5.25 &times; 10−6 C
Problem 63
a) E = 1000 N/C
b) t = 3.37 &times; 10−8 s
c) Will accelerate in the opposite direction at 1.76 &times; 1014 m/s2
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