Tuning a guitar string, you play a pure 330 Hz note using a tuning device, and pluck the string. The combined notes produce a beat frequency of 5 Hz. You then play a pure 350 Hz note and pluck the string, finding a beat frequency of 25 Hz. What is the frequency of the string note?

The  frequency is  

Explanation:

From the question we are told that

    The frequency for the first note is  

     The  beat frequency of the first note is  

     The  frequency for the second note is  

      The  beat frequency of the first note is

Generally beat frequency is mathematically represented as

Where are frequencies of two sound source

  Now in the case of this question

For the first note

Where  F is the frequency of the string note

For the second note  

Adding  equation 1 from 2

substituting values

=>    

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.

less than one you can't create energy