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A uniform bar AB is balanced on a knife-edge which is 60cm from B by...

Physics
WAEC 2015
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
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Correct Answer: Option B
Explanation
clockwise movement = anticlockwise movement

w x 10 = 22 x 30

w = \(\frac{22 \times 30}{10}\)

w = 66.0g
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