15-1Formation Propagation of a Mechanical Wave机械波的产生和传播 15-2 Wave Speed& Elasticity of the Medium 机械波的传播速度媒质的弹性(自学) 15-3 Wave Function of a Plane SHW 平面简谐波波动方程 15-4 Energy Energy Flow and Wave Intensit 波的能量波动强度
5-1 Motion of Rigid body刚体的平动、转动和定轴转动 5-2 Torque The Law of Rotation rotational Inertia力矩刚体定轴转动定律转动惯量 5-3 Applying the Law of rotation转动定律的应用 5-4 Kinetic Energy and Work in Rotational Motion定轴转动的动能定理 5-5 Angular Momentum of a rigid Body Conservation of Angular Momentum定轴转动的刚体的角动量定理和角动量守恒定律