Final answer:
The question referring to the effects of a 75 Hz resonance frequency on the human body lacks the necessary context to provide a conclusive answer. Resonance occurs when a frequency matches the natural frequency of another object, so lower frequencies like 75 Hz might be felt in larger parts of the body, but without specific data, we cannot choose an exact body part from the options provided.
Step-by-step explanation:
The question asks what part of the body would be affected by resonance at a frequency of 75 Hz from floor-standing mixers. In the field of physics, particularly when dealing with sound frequencies, resonance can occur when an object vibrates at a specific frequency that matches the natural frequency of another object, causing the second object to also vibrate. However, this question cannot be answered accurately without additional context regarding resonance effects on the human body at specific frequencies. If we are discussing the effects of vibration frequencies in general, lower frequencies, such as 75 Hz, can often be felt as vibrations in larger parts of the body. Therefore, without specific information on resonance effects on the human body, it is not possible to select from the given options which part of the body would be affected by a 75 Hz frequency.