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班級:光電一乙 姓名:高柏翔 學號:498L0106 98 學年度第 1 學期 Chap1 作業 1. The speed of light is about 3.00 × 108 m/s. Convert this figure to miles per hour. Sol: 1mile=1609m 3 ＝3 ＝６.７ 2. A point is located in a polar coordinate system by the coordinates r = 2.5 m and θ = 35°. Find the x- and y-coordinates of this point, assuming that the two coordinate Y systems have the same origin. Sol: (X,Y) Ｘ＝ｒ ＝２.５（ｍ） ＝２.５ r=2.5m ｍ Ｙ＝ｒ ＝２.５（ｍ） ＝１.４ｍ 35˚ X A:（Ｘ，Ｙ）＝（２，１.４）ｍ 3. For the triangle shown in Figure 1, what are (a) the length of the unknown side, (b) the tangent of θ, and (c) the sine of φ? Sol: （ａ） Ｘ＝ ６.７ｍ （ｂ） = ＝０.８９５ （ｃ） ＝ ＝０.７４ Figure 1