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19. 某質點的運動是以關係式x=t3-9t2+24t-10定義,其中x的單位為公尺,而t為秒,試求當t=5秒時的速度為何?(A) 9 m/s (B) 12 m/s (C) 15 m/s (D) 20
問題詳情
19. 某質點的運動是以關係式x=t3-9t2+24t-10定義,其中x的單位為公尺,而t為秒,試求當t=5秒時的速度為何?
(A) 9 m/s
(B) 12 m/s
(C) 15 m/s
(D) 20 m/s
參考答案
上一篇 :
72. 一般示波器觸發信號的交連方式有下列哪幾種?(A)HF REJ(B)DC(C)RF REJ(D)AC。
下一篇 :
73. 使用砂輪機研磨工具物時應注意下列哪些事項?(A)砂輪出現抖動乃正常現象毋須恐慌(B)不宜固定以砂輪的某一處研磨工具物(C)不可站在砂輪旋轉方向的正面位置(D)應帶防塵口罩與護目鏡等安全用具。
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