周次: 3 日期: March 11, 2022 节次: 2 In this lecture, we’ll give a brief introduction to the concepts of works and fluid pressures. Many examples will be presented. This lecture covers §6.6 and §6.7. Outline Work Work refers specifically to a force acting on a body and the body...
周次: 3 日期: March 9, 2022 节次: 1 A curve sweeps out a surface in the space around is called a surface of revolution. The “area” of this surface depends on the length of the rope and the distance of each of its segments from the axis of revolution. In this section, we calculate the area of surface of...
周次: 2 日期: March 4, 2022 节次: 2 Outline In this lecture, we discuss moments ( 质量矩）and centers of mass. Two concepts are related. In this lecture, we only deal with one- and two-dimensional problems (Essentially all the problems been dealt with are in one-dimension). Basic Principle for Center of Mass and Moment Definition. (Center of Mass) For...