Answer:
Rust is a compound. What makes iron rust is its reaction with oxygen and moisture in the air.
Answer:
(a) Current is 2831.93 A
(b) 
(c) 
Explanation:
Length of wire l = 3.22 m
Diameter of wire d = 7.32 mm = 0.00732 m
Cross sectional area of wire

Resistance 
Potential difference V = 33.7 volt
(A) current is equal to

(B) Current density is equal to


(c) Resistance is equal to



The answer should be C) Slide against each other.
Yes, that's correct. The note "A" (which is used to tune the other strings of the guitar) corresponds to a frequency of 440 Hz.