Test Index

WAEC Physics 2014 Paper

Question : 10

Total: 48

Solution:

Concept:

For a balanced metre rule, the clockwise moment equals the anticlockwise moment.

Explanation:

The mass

M

creates an anticlockwise moment about the pivot.

The

100\,g

mass creates a clockwise moment.

Using the principle of moments:

M \times 40 = 100 \times 10

M = \frac{1000}{40}

M = 25\,g

Answer:

The value of

M

25.0\,g

Correct option: D.

25.0\,g

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