Answer: C
Explanation: The correct answer would be Inertial. I take the quiz and got the answer rght!!
The beat frequency is the concept required to develop this process. The phenomenon is generated when you have two waves but their frequencies do not differ greatly. So the beat frequency will be the difference between those two waves. For this case we have the difference and one of the waves, therefore,

Our values are given as,


Using the formula of the frequency I will have,

Replacing we have,



The possible values are two: 1045Hz and 1055Hz
The anwser is 1.475124 horsepower.
High digital and high are the answers.
hope this helps