Question

aviva.to || 藍海

物理力矩
題目:7b 書中的是答案是62.8Nm (逆時針)
我不太能算出來qwq

le Scu
a square object as shown
(Fid c). O is the centre of
the object. Which force(s)
produce(s) the largest moment
Y
z
Fig C
about O?
7 What is the moment of the force about o in each
of the following cases?
(a)
5N
350
5 cos 350 ( 2 )
25 cm
Tolot - 1.02 Nom Canticalck)
*(b)
50 N
35°
30°
1.2 m
*8 Objects P and Q are put on the two sides of a
plank pivoted at O (Fig d). The plank remains
horizontal. The distance between P and O is da
the

Answer 1

讀

50×cos25°×1.2/√3×2

aviva.to || 藍海

為甚麼是√3x2 (´；ω；｀)

讀

1.2公尺除以根號3乘以2
30°60°90°三角形三邊比為1：根號3：2