【co2yes55人生逆轉勝】評論
1200/9.8=122.44897kg-m*6.28*450/4500=76.89ps解:1.牛頓先換算成kg-m 1200n-m/9.8=122.44897kg-m2.ps=T*2πN/4500 代入122.44897*6.28*450/4500=76.89(PS)所以選項A答案應是76.8可能誤植75.8請修改