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1 兩圓錐摩擦輪之軸線成正交,若主動輪轉速1000 rpm,從動輪之全頂角為60°,則從動輪之轉速為多少rpm? 103 統測
A 1000×sin 60°
B 1000×cos 60°
C 1000×tan 30°
D 1000×cot 30°

θ=90°;2θ從=60°;θ從=30°

θ主=90°-30°=60°

N從 N主= sinθ主 sinθ從

N從1000= sin60° sin30°

N從=1000cot30° rpm