An aluminum wire with a diameter of 0.095 mm has a uniform electric field of 0.215 V/m imposed along its entire length. The temperature of the wire is 55.0°C. Assume one free electron per atom. (a) Use the information in this Table of Resistivities and Temperature Coefficients to determine the resistivity (in n· m) of aluminum at this temperature. p = Ω. m (b) What is the current density (in MA/m2) in the wire? MA/m2 (c) What is the total current (in mA) in the wire? I = mA (d) What is the drift speed of the conduction electrons? Va = um/s (e) What potential difference must exist between the ends of a 1.50 m length of the wire to produce the stated electric field? AV = 0.322

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!