Constants I Periodic Table Part A You\'re writing the instruction manual for a p
ID: 2031084 • Letter: C
Question
Constants I Periodic Table Part A You're writing the instruction manual for a power saw, and you have to specify the maximum permissible length What do you specify for the maximum length extension cord, given that they come in 25-foot increments? Express your answer using two significant figures (diameter 1.0 mm) The saw draws 9.0 A and needs a minimum of 115 V across its motor when the outlet supplies 120 V Submit incorrect; one attempt remaining. Try Again; no points deducted Provide Feedback Next>Explanation / Answer
Given,
d = 1 mm ; ; I = 9 A ; V = 115 V ; Vo = 120 V
The drop across the wire will ve:
V' = 120 - 115 = 5 V
We know from Ohm's law
V = IR => R = V/I
R = 5/9 = 0.56 Ohm
we know that, R = rho L/A
L = R A/ rho
L = 0.56 x 3.14 x (0.5 x 10^-3)^2/(1.68 x 10^-8) = 26.17 m
the length should be half
L = 26.17/2 = 13.085
L = 26.17 m = 3.281 x 13.085 ft = 42.93 ft
Hence, L = 42.93 Ft