【評論主題】Dear Sophia,    My family and I finally settled down in Lucky Town. We are going to throw a party at

【評論內容】這題方向是在We are going t☆ ☆☆☆☆☆ ...

【評論主題】3 如圖所示之滑輪組，欲吊起 180 kg 之物重 W 時，則施力 F 最少需施加多少的力量？(A) 20 kg(B) 30 kg(C) 40 kg(D) 50 kg

【評論內容】

Ma=6, F=180/6=30kg