多态性(polymorphism)也是面向对象程序设计的标志 性特征。前面我们讨论过面向对象的两个重要特性一封装性和 继承性,这三大特性是相互关联的,封装性是基础,继承性是 关键,而多态性是补充。 简单地说,在C++语言中,同一程序的某个运算符或者某 个函数名在不同情况下具有不同的实现的现象,叫做多态性。 其实在C语言中,我们已经接触过多态性的应用,对于不 同类型的数据,运算符“\\”具有不同的运算含义,如果两个 操作数都是整数,那么“\\”进行整数相除,结果也是整数, 而其中一个操作数是实数类型的,那么“”进行的是数学上 普通的除法,因此,面对不同的处理对象,“”运算符有不 同意义

一、普通平键

Chap. 14: Energy in Thermal Processes Solids, liquids or gases have internal energy t Kinetic energy from random motion of molecules translation rotation vibration

The Simple Pendulum A pendulum is made by suspending a mass m at the end of a string of length L Find the frequency of oscillation for small displacements mg

At ordinary temperature, matter exists in one of three states Solid- has a shape and forms a surface Liquid- has no shape but forms a surface Gas-has no shape and forms no surface What do we mean by“ fluids”? F| uids are“ substances that flow

The kinetic energy of a rotating system looks similar to that of a

The impulse of the force action on an object equals the change in momentum of the object

Work Kinetic-Energy Theorem: (Net Work done on object] change in kinetic energy of object

Summary (with comparison to 1-D kinematics)

Chapter 5 Uniform Circular Motion Macintosh PICT image format is not supported What does it mean? How do we describe it? What can we learn about it