SOLUTION: The electrical resistance R of a wire varies directly as the length L and inversely as the square of the diameter d. Obtain an equation connecting R,L and d if R =27 when L=3 and d

Question 1161670: The electrical resistance R of a wire varies directly as the length L and inversely as the square of the diameter d. Obtain an equation connecting R,L and d if R =27 when L=3 and d=2. Calculate (a) value of R when L=8, d=3
(b) value of d when R=16,L=18
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
The electrical resistance R of a wire varies directly as the length L and inversely as the square of the diameter d.
Obtain an equation connecting R,L and d if R =27 when L=3 and d=2.
----
R = k*L/d^2 ---- k = a constant
27 = k*3/4
k = 36
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Calculate (a) value of R when L=8, d=3
Sub, do arithmetic
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(b) value of d when R=16,L=18
Sub, do arithmetic

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