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082-Engineering-Mathematics-Anthony-Croft-Robert-Davison-Martin-Hargreaves-James-Flint-Edisi-5-2017

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Review exercises 3 153

(d) 1.581sin(ωt +0.4636), amplitude = 1.581,

phaseangle = 0.4636

(e) −3sin ωt,amplitude = 3, phase angle = π

14 (a) 0.5487,2.5929 (b) 3.5232,5.9016

(c) 0.3947,5.8885

(e) 0.1427,3.2843

(d) 3.1416, i.e. π

(f)

4 , 7π 4

15 (a) 0.2865,1.2843,3.4281,4.4259

(b) 1.0293,2.1123,4.1709,5.2539

(c) 4.2457

(d) 0.2120,0.5734,1.7828,2.1442,3.3536,3.7150,

4.9244,5.2858

(e) 0.5796,2.5620,3.7212,5.7035

(f) 0.4480,2.0188,3.5896,5.1604

16 (a) 9.5070 ×10 −3 (b) 4.5070 ×10 −3

(c) 1.9507 ×10 −2

17 (a) 0 (b) −2sin10 ◦

(c) √ 2

(d) cos70 ◦

(d) 5.8751 ×10 −3

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