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barcode scanner in asp.net web application Velocity vectors are red Displacement vectors are green in ObjectiveC
Velocity vectors are red Displacement vectors are green Scan QR In ObjectiveC Using Barcode Control SDK for iPhone Control to generate, create, read, scan barcode image in iPhone applications. Drawing Quick Response Code In ObjectiveC Using Barcode generator for iPhone Control to generate, create QR image in iPhone applications. The symbol means that the lefthand side of the equation is defined by the righthand side It is a common misconception to say that the slope of a positiontime graph gives the speed of the object Consider the slope of the positiontime graph shown in Figure 221 The slope of this positiontime graph is 50 m/s As you can see the slope indicates both the magnitude and direction Recall that average velocity is a quantity that has both magnitude and direction The slope of a positiontime graph indicates the average velocity of the object and not its speed Take another look at Figure 221 The slope of the graph is 50 m/s and thus, the object has a velocity of 50 m/s The object starts out at a positive position and moves toward the origin It moves in the negative direction at a rate of 50 m/s Average speed The absolute value of the slope of a positiontime graph tells you the average speed of the object; that is, how fast the object is moving The sign of the slope tells you in what direction the object is moving The combination of an object s average speed, v, and the direction in which it is moving is the average velocity, v Thus, for the object represented in Figure 221, the average velocity is 50 m/s, or 50 m/s in the negative direction Its average speed is 50 m/s Remember that if an object moves in the negative direction, then its displacement is negative This means that the object s velocity always will have the same sign as the object s displacement As you consider other types of motion to analyze in future chapters, sometimes the velocity will be the 4 5 important quantity to consider, while at other times, the speed will be the important quantity Therefore, it is a good idea to make sure that you understand the differences between velocity and speed so that you will be sure to use the right one later Decoding QR Code In ObjectiveC Using Barcode decoder for iPhone Control to read, scan read, scan image in iPhone applications. Drawing Barcode In ObjectiveC Using Barcode maker for iPhone Control to generate, create bar code image in iPhone applications. Figure 221 The object whose motion is represented here is moving in the negative direction at a rate of 50 m/s Painting Quick Response Code In C# Using Barcode creation for .NET Control to generate, create QR image in .NET framework applications. QR Code ISO/IEC18004 Maker In .NET Framework Using Barcode generation for ASP.NET Control to generate, create Denso QR Bar Code image in ASP.NET applications. 20 15 10 Position (m) 5 0 1 5 10 15 2 3 Time (s) Generate QR Code 2d Barcode In Visual Studio .NET Using Barcode generation for .NET framework Control to generate, create QR Code JIS X 0510 image in .NET framework applications. QR Code JIS X 0510 Maker In Visual Basic .NET Using Barcode generator for .NET Control to generate, create Quick Response Code image in .NET framework applications. 2 Representing Motion
Encoding Barcode In ObjectiveC Using Barcode creation for iPhone Control to generate, create bar code image in iPhone applications. Encoding Code 128 Code Set C In ObjectiveC Using Barcode creation for iPhone Control to generate, create Code 128 Code Set C image in iPhone applications. The graph at the right describes the motion of a student riding his skateboard along a smooth, pedestrianfree sidewalk What is his average velocity What is his average speed UCC128 Generation In ObjectiveC Using Barcode creator for iPhone Control to generate, create EAN / UCC  13 image in iPhone applications. Drawing DataMatrix In ObjectiveC Using Barcode generation for iPhone Control to generate, create Data Matrix 2d barcode image in iPhone applications. Analyze and Sketch the Problem
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Linear Encoder In Visual Basic .NET Using Barcode printer for .NET Control to generate, create Linear 1D Barcode image in Visual Studio .NET applications. Bar Code Generation In Visual Studio .NET Using Barcode drawer for Reporting Service Control to generate, create bar code image in Reporting Service applications. Unknown: v v
Find the average velocity using two points on the line v
d t d2 t2 d1 t1 60 m 40 s
Substitute d2 120 m, d1 Use magnitudes with signs indicating directions
10 20 30 40 50 60 70 80 90 Time (s) 120 m 80 s
60 m, t2
80 s, t1
40 s Math Handbook
Slope page 850
15 m/s in the positive direction
The average speed, v , is the absolute value of the average velocity, or 15 m/s
Evaluate the Answer
Are the units correct m/s are the units for both velocity and speed Do the signs make sense The positive sign for the velocity agrees with the coordinate system No direction is associated with speed a What is the ship s average speed b What is its average velocity 26 Describe, in words, the motion of the cruise ship in the previous problem 27 The graph in Figure 223 represents the motion of a bicycle Determine the bicycle s average speed and average velocity, and describe its motion in words 28 When Marilyn takes her pet dog for a walk, the dog walks at a very consistent pace of 055 m/s Draw a motion diagram and positiontime graph to represent Marilyn s dog walking the 198m distance from in front of her house to the nearest fire hydrant Position (m) 25 The graph in Figure 222 describes the motion of a cruise ship during its voyage through calm waters The positive ddirection is defined to be south Time (s) 1 0 2 3 4 2 Figure 222 20 Position (km) 15 10 5 0 Figure 223 5 10 15 20 25 30 Time (min)

