問題詳情

2 求 xy 平面上與正 x 軸夾角為 0.3π,長度為 3 的向量 F 為何?
(A)F = 3cos(0.3π)i+3sin(0.3π)j
(B)F = 3sin(0.3π)i+3cos(0.3π)j
(C)F = 3cos(0.3π)i-3sin(0.3π)j
(D)F = 3sin(0.3π)i-3cos(0.3π)j

參考答案

答案:A
難度:非常困難0
統計:A(0),B(0),C(1),D(0),E(0)

內容推薦

內容推薦