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WAEC Physics 2014 Paper

Question : 11

Total: 48

Solution:

Concept:

The period is the time taken for one complete vibration. The total time is the same for both pendulums.

Explanation:

For pendulum X, period

T_X = 5\,\text{s}

If X makes 20 vibrations, total time is:

t = 20 \times 5\,\text{s} = 100\,\text{s}

Pendulum Y makes 50 vibrations in this same time of

100\,\text{s}

Therefore, period of Y is:

T_Y = \frac{100\,\text{s}}{50} = 2\,\text{s}

Answer:

2.0\,\text{s}

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