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Unformatted text preview: Massachusetts Institute of Technology Department of Physics 8.022 Spring 2004 Assignment 5: RC, Kirchhoff, EMF Post date: Thursday, March 11th Due date: Thursday, March 18th Be sure to write your name and section number on your pset Please staple multiple pages together 1. Exploding wire revisited (15 pts): In lecture, I essentially evaporated a wire made out of nichrome, a nickel-chrome alloy. In this problem you will explore quantitatively why this happened. The relevant facts you will need are: • Capacitor has C c = 0 . 1 milliFarads; potential difference in capacitor is V ’ 3500 Volts. • Resistivity of nichrome wire is ρ r = 1 . 5 × 10- 6 Ohm-meters; length of wire is L ’ 20 centimeters; radius of wire is r ’ . 1 millimeters. • Nichrome has a density ρ m ’ 8 . 4 × 10 3 kg/m 3 , and a specific heat C H ’ 420 Joules/(kg - Kelvin). Before doing the problem, you should calculate the resistance of the nichrome wire R , its mass M , and its heat capacity (specific heat times mass). (Don’t keep more than 1 decimal place — this calculation is essentially what’s known as a “back of the envelope estimate”. Great precision is not needed, nor even appropriate!) (a) [4 pts] How much energy was stored in the capacitor before I discharged it through...
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This homework help was uploaded on 04/11/2008 for the course PHYSICS 8.022 taught by Professor Hughes during the Spring '08 term at MIT.
- Spring '08