問題詳情

40. A 5 kg ball is held in the hand as shown in the figure, with the armhorizontal and 40 cm from the elbow joint. The forearm mass is 2 kgand the center of gravity is 18 cm from the joint. The biceps connectto the arm at 5 cm from the joint. How much force (FM) must the bicepsexert to hold the ball in place? (Gravitational acceleration g = 10 m/s2)


(A) 472 N
(B) 236 N
(C) 118 N
(D) 59 N
(E) 30 N

參考答案

答案：A
難度：計算中-1
書單：沒有書單，新增

用户評論

【面試倒楣鬼-22幸運上後西】評論

炫砲但生活化(?)的力矩問題:F*5 = 2*18*g +5*40*g