A uniform bar AB is balanced on a knife-edge which is 60cm from B by a mass of 22g which hangs at C 10cm from A. Calculate the mass of the bar.
A
133.2g
B
66.0g
C
60.0g
D
22.0g
Verified Correct Answer: B.
Physical Principles & Numerical Solution
clockwise movement = anticlockwise movement
w x 10 = 22 x 30
w = \(\frac{22 \times 30}{10}\)
w = 66.0g
Source: Myschool Past Questions Archive (Record #45443)