If a tuning fork has 75 Hz, how many cycles per second does it vibrate?

The frequency is defined as the number of vibrations (or number of cycles) per second. For example, if a certain device oscillates with frequency of 1 Hz, it means it makes 1 complete vibration/cycle each second. The tuning fork in this problem has a frequency of f=75 Hz, therefore it makes exactly 75 cycles per second.