# lecture5 - Statistics HW1 Count: 88 Average: 115.3 edian:...

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Unformatted text preview: Statistics HW1 Count: 88 Average: 115.3 edian: 15 0 Median: 115.0 Maximum: 195.0 Minimum: 0.0 Standard Deviation: 43.85 1 Chapter 3 Vectors and wo- imensional Motion Two Dimensional Motion continued 2 Problem 3.59 The projectile leaves e gun at the same the gun at the same instant the target is dropped from rest. Assuming that the gun is initially aimed at the target, Fig. P3.59, p. 80 show that the projectile will hit the target. 3 elative motion is important Relative motion is important for many activites 4 elative motion is important Relative motion is important for many activites y jet A x y B-2A x y x 5 earth Relative Velocity Relative velocity is about relating the measurements of two different observers, one moving with respect to the other ay be useful to use a oving frame f May be useful to use a moving frame of reference instead of a stationary one Specify the frame of reference - the motion may be different in different frames of reference No specific equations to learn 6 palm tree with coconuts on A palm tree with coconuts on a moving truck V TE 7 Multiple-choice Question 12 ( i ) Which curve below best describes the path followed by the coconut as seen by a tationary observer on the ground (boys) who stationary observer on the ground (boys), who observes the truck moving from the left to the right? Which best describes the path as seen by ( ii ) Which best describes the path as seen by an observer sitting in the truck (bird)? 8 Relative Velocity Notation The pattern of subscripts can be seful in solving relative velocity useful in solving relative velocity problems ssume the following notation: Assume the following notation: E is an observer, stationary with spect to the earth respect to the earth A and B are two moving cars 9 Relative Position First letter tells us what the vector is ointing to pointing to Second letter tells us where the vector starts 10 Relative Position First letter tells us what the vector is ointing to pointing to Second letter tells us where the vector starts The position of car A relative to car B is given by the vector subtraction equation 11 Relative Velocity Equations The rate of change of the isplacements gives the displacements gives the relationship for the velocities v v A B A E B E v v v 12 Problem 3.36 A boat moves through the water of a river t 10m/s relative to the water regardless at 10m/s relative to the water, regardless of the boats direction. If the water in the river is flowing at 1.5 m/s, how long does it take the boat to make a round trip consisting of a 300 m displacement downstream followed by a 300 m displacement upstream?...
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## This note was uploaded on 10/05/2009 for the course PHY 1603 taught by Professor Boudreaux during the Spring '08 term at The University of Texas at San Antonio- San Antonio.

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lecture5 - Statistics HW1 Count: 88 Average: 115.3 edian:...

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