A uniform meter rule QR is balanced on a knife edge which is 55cm from...

JAMB 1986

A uniform meter rule QR is balanced on a knife edge which is 55cm from R, when a mass of 10g is hung at P as shown above, the mass of the meter rule is

A. 550g
B. 350g
C. 70g
D. 35g

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Correct Answer: Option C

Explanation

Taking a moment about the support.

m(55 - 50) = 10(90 - 55)

5 m = 10 x 35

5 m = 350

m = \(\frac{350}{5}\) = 70g

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A uniform meter rule QR is balanced on a knife edge which is 55cm from...

Correct Answer: Option C

Explanation

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