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Read e-book online Answers to a Selection Problems from Classical PDF

By van Wijk K.

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Z += vz; The velocity component vz remains unchanged except when the ball bounces off a wall perpendicular to the z direction. This is because the z direction is also horizontal in this context, and gravity does not act horizontally. The remaining additions in the code implement bouncing at the walls, following the same logic as that for bouncing at the ground (and taking into account the size of the ball). as. There you are—a ball bouncing inside an invisible 3D box! Never mind if you can’t see the box yet; we’ll fix that soon.

For example, the following variable x is defined to hold values that are numbers (we are omitting private keywords): var x:Number; Subsequently, x may only be assigned values that are numbers. 0 Topics This assignment can be done together with the following variable declaration or anywhere else in the code: var x:Number = 2; One can also perform arithmetic on x; for example, the following code multiplies x by a number, adds the result to another variable y, and assigns the result to a third variable z: z = 2*x + y; This resembles algebra, with some notable differences.

Then each time you want a particle, you invoke the Particle class. The following sections describe how to produce an object from a class, create a class, and understand what it consists of. Classes and objects Let’s take another look at the BouncingBall class from the last chapter. ENTER_FRAME,onEachTimestep); } The ball object is an instance of the Ball class, and is created (or instantiated) by this code: ball = new Ball();• The ball is subsequently made visible (technically added to the Display List) by the addChild command: addChild(ball); Note that the Flash movie is made from a class.

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Answers to a Selection Problems from Classical Electrodynamics John David Jackson by van Wijk K.

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