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A 17.0 −m -long cable consists of a solid-inner, cylindrical, nickel core 12.0 cm in diameter...

A 17.0 −m -long cable consists of a solid-inner, cylindrical, nickel core 12.0 cm in diameter surrounded by a solid-outer cylindrical shell of copper 12.0 cm in inside diameter and 24.0 cm in outside diameter. The resistivity of nickel is 7.8×10−8 Ω⋅m

Part A

Calculate the resistance of this cable?

Part B

If we think of this cable as a single material, what is its equivalent resistivity?   
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