ps03sol - Physics 8.01T MASSACHUSETTS INSTITUTE OF...

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MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Physics Physics 8.01T Fall Term 2004 Problem Set 3: Newton's Laws of Motion, Motion: Force, Mass, and Acceleration, Vectors in Physics Solutions Problem 1: ( Relative Inertial Frames) You and a friend are in an elevator that is rising at constant but unknown velocity v 0 . You are curious to know what speed the elevator is moving. You each happen to be carrying altimeters. You get an idea and drop your keys from a height h above the floor of the elevator. You hold one altimeter at the point where you dropped the keys and your friend places the other one on the floor. You check your altimeter when you release the keys and find the keys are a height d above sea level. Your friend checks the other altimeter when the keys hit the floor and finds the keys are the same height d above sea level. Assume that the gravitational constant is g . You will analyze this problem from two different reference frames. The first reference frame moves with the elevator. The second reference frame is fixed to the ground. a) As seen from a reference frame moving with elevator, how long does it take for the keys to hit the floor? b) As seen from a reference frame fixed to the ground, using your result from part a), find an expression for the speed of the elevator in terms of the height h .

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This note was uploaded on 04/22/2011 for the course PHYSICS 1441 taught by Professor Spurlock during the Spring '10 term at UT Arlington.

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ps03sol - Physics 8.01T MASSACHUSETTS INSTITUTE OF...

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