youn need to use your hands
Given:

frequency, f = 60.0 Hz
frequency, f' = 45.0 Hz

Solution:
To calculate max current in inductor,
:
At f = 60.0 Hz


L = 0.1326 H
Now, reactance
at f' = 45.0 Hz:


Now,
is given by:
Therefore, max current in the inductor,
= 2.13 A
Answer:

Explanation:
From the question we are told that:
Incremental resistance 
Resistor Feed 
Supply Change 
Generally the equation for voltage rate of change is mathematically given by

Therefore



Answer:
No, they need to be somewhat flexible so that forces such as turbulance don't shear the wing off.