In the diagram above a rod 50 cm long of unifor... - JAMB Physics 2007 Question
A
40N
B
80N
C
120N
D
200N
correct option: b
Being a uniform rod, the height W should be acting at the mid point 25cm mark.
∴ Taking moment about the fulcrum, F,
200 x 10 = W x 10 + 40 x 30
2000 = 10W + 1200
=> 10W = 2000 - 1200
= 800
w = 800/10 = 80N
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