Answer:
0.0025H
Explanation:
I didn't come here to be part of this all I wanted is just information for my research 
 
        
             
        
        
        
Answer:
the frequency of the second harmonic of the pipe is 425 Hz
Explanation:
Given;
length of the open pipe, L = 0.8 m
velocity of sound, v = 340 m/s
The wavelength of the second harmonic is calculated as follows;
L = A ---> N   +  N--->N   +   N--->A
where;
L is the length of the pipe in the second harmonic
A represents antinode of the wave
N represents the node of the wave

The frequency is calculated as follows;

Therefore, the frequency of the second harmonic of the pipe is 425 Hz.
 
        
             
        
        
        
Answer:
mass is directly proportionate to magnetic force.
Explanation:
the more mass the more magnetic force