Problem 3: Copper has a resistivity of pc = 1.72 x 10-8 2 m. An extension cord made of copper is connected toa DC electric motor which requires a current of at least Imin = 7.5 A in order to operate. The cord is connectedto a V = 199 V source.Part (a) Input an expression for the maximum ratio of length to cross-sectional area, y, the cord can have if the motor is tooperate.Expression :Ymax =Select from the variables below to write your expression. Note that all variables may not be required.а, В,0, a, d, g, h, Imin j, k, m, P, t, VPart (b) What is the ratio numerically in 1/m?Numeric : A numeric value is expected and not an expression.Ymax =Part (c) Experimentally, it is found that the maximum length the cord can be is Lmax = 30 m. What is the wire's minimumdiameter, Dmin, in meters?Numeric : A numeric value is expected and not an expression.Dmin =

Question is based upon Ohm's law and resistivity.

Problem 3: Copper has a resistivity of pc = 1.72 × 10-8 2 m. An extension cord made of copper is connected to a DC electric motor which requires a current of at least Imin = 7.5 A in order to operate. The cord is connected to a V = 199 V source.

Problem 3: Copper has a resistivity of pc = 1.72 × 10-8 2 m. An extension cord made of copper is connected to a DC electric motor which requires a current of at least Imin = 7.5 A in order to operate. The cord is connected to a V = 199 V source.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Question

Problem 3: Copper has a resistivity of pc = 1.72 x 10-8 2 m. An extension cord made of copper is connected to
a DC electric motor which requires a current of at least Imin = 7.5 A in order to operate. The cord is connected
to a V = 199 V source.
Part (a) Input an expression for the maximum ratio of length to cross-sectional area, y, the cord can have if the motor is to
operate.
Expression :
Ymax =
Select from the variables below to write your expression. Note that all variables may not be required.
а, В,
0, a, d, g, h, Imin j, k, m, P, t, V
Part (b) What is the ratio numerically in 1/m?
Numeric : A numeric value is expected and not an expression.
Ymax =
Part (c) Experimentally, it is found that the maximum length the cord can be is Lmax = 30 m. What is the wire's minimum
diameter, Dmin, in meters?
Numeric : A numeric value is expected and not an expression.
Dmin =

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