A uniform metre rule is balanced on a fulcrum placed at the 35cm mark by…

A uniform metre rule is balanced on a fulcrum placed at the 35cm mark by suspending a mass of 120g at the 10cm mark. Calculate the mass of the metre rule.
  • A.
    60g
  • B.
    80g
  • C.
    120g
  • D.
    200g
Correct Answer: Option D
Explanation

Clock-wise moment = Anti-clock wise
15 x m = 5 x 10
m = 200g

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In the diagram, |SR| = |QR|. o and o, find A. 65o B. 45o C. 25o D. 19o…
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