Math 237 Assignment 5 Due: Friday, Oct 22nd 1. Let f ( x, y ) = ln( x 2 + y 2 ). a) Find the directional derivative of f at (-1 , 2) in the direction of the vector ~v = (3 ,-4). b) Find the direction in which f is increasing the fastest at (1 , 1). What is the magnitude of this rate of change? c) Find the equation of the tangent line at (1 , 1) to the level curve f ( x, y ) = ln 2. 2. A space-ship cruising on the sunny side of the planet Venus starts to overheat. The space-ship is located at (1 ,-1 , 1) and the temperature of the ship’s hull when at location ( x, y, z ) will be T = 200 + e-x 2-2 y 2-3 z 2 , where x , y , z are in meters. a) In what direction should the ship proceed in order to decrease the temperature the quickest. b) If the ship travels at
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This note was uploaded on 12/10/2010 for the course MATH 237 taught by Professor Wolczuk during the Spring '08 term at Waterloo.