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CCF08182010_00015

# CCF08182010_00015 - 70 FE/El'l Sample Examinations 11%w(41...

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Unformatted text preview: 70 FE/El'l' Sample Examinations 11. %w(41 IIl)2 +i7r(11 In)2 + i'ﬂG In)2 = 4084.1 m2 (4080 m2) Answer is D. 12. Differentiating, y’=27x2+2x—15 y”:54m+2:0 2 x _ —5—4 _ —0.037 y(—0.037) = 32.56 (—0.037, 32.56) Answer is C. 13. |R|= (1+2—1)2+(:>,+7+4)2+(4—1+2)2 =¢m = 225 :15 Answer is C. 14. Multiplying through by 2 gives x" + 830' + 16x : 10 The characteristic equation is ﬁ+o+w=0 Professional Publications, Inc. The roots of the characteristic equation are T1:T2:—4 The homogeneous (natural) response is xnatural = 146—“ + Bte—4t By inspection, :0 : 5/8 is a particular solution that solves the nonhomogeneous equation, so the total response is a: = Ara—4t + Bite—4t + % Sincex=1 att=0, 80+ ll calm :3 color: 1 A Differentiating av, 22’ = (g) (—4)?4t + B( — 4256—“ + 6“”) + 0 Since x’ = 0 at t = 0, 0:—§+B(0+1) B: OOIOJ [0100 a: : 6““ + gte_4t + 3 Answer is D. 15. Since y” = 14, this is a minimum value at this point. y'=14\$—3=0 m=3/14 ,(%)=(7,<,;y_(3,(%),8 9 9 = 215/28 Answer is D. 16. From the double angle formulas, sin 26 = 25in6 c036 Answer is A. 17’ imaginary real | | | | a ...
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