The electrical resistance of a wire varies directly with the length and inversely with the square of the diameter of the wire. If a wire 432 feet long and 4 millimeters in diameter has a resistance of 1.24 ohms, find the length of a wire of the same material whose resistance is 1.44 ohms and whose diameter is 3 millimeters.

I have to find the answer in feet rounding to rounding to 2 decimal places.

Question

The electrical resistance of a wire varies directly with the length and inversely with the square of the diameter of the wire. If a wire 432 feet long and 4 millimeters in diameter has a resistance of 1.24 ohms, find the length of a wire of the same material whose resistance is 1.44 ohms and whose diameter is 3 millimeters. 

I have to find the answer in feet rounding to rounding to 2 decimal places.

rvc · Answer

the same question again???

anonymous · Answer

ya I cannot figure it out for the life of me I have over 10 pages of notes and I feel like I am getting nowhere

anonymous · Answer

I feel like im close but I might be rounding wrong
I have 282.3529