Using 0.500 g of nichrome, you are asked to fabricate a wire with uniform cross-section. The resistance of the wire is 0.673 Ω. The nichrome has a resistivity of 1.00 10^-6 Ω · m and a density of 8.31 10^3 kg/m^3.

a. What length of wire do you end up with?
b. What is the radius of the wire?

Explanation:

Given that,

Mass of Nichrome, m = 0.5 g

The resistance of the wire, R = 0.673 ohms

Resistivity of the nichrome wire,

Density,

(A) The length of the wire is given by using the definition of resistance as :

Volume,

Area,

....(1)

(b)  Equation (1) becomes :

Hence, this is the required solution.                                                                  

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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b would be the answer