A bar AB is balanced horizontally on two knife edges as illustrated as in the diagram above. Determine the weight of the bar.
Attached Figure / Diagram
A
10.0N
B
20.0N
C
40.0N
D
50.0N
Verified Correct Answer: C.
Physical Principles & Numerical Solution
Upward force = downward force = weight of the Bar
20N + 20N = Weight of the BAR
Therefore, the weight of the bar = 40N
Source: Myschool Past Questions Archive (Record #49769)