As you sit on a dock, you notice a wave crest pass. you count another 16 wave crests in the next eight seconds. what is the frequency of these waves?

2 Hz

Explanation:

The frequency of a wave is the number of complete oscillations in one second. It can also be calculate as the number of crests that pass on a given point in one second.

In this case, you count 16 waves that pass the given point in 8 seconds. Therefore, the frequency will be the number of waves divided by the time taken:

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this