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