When the only force acting on a particle is always directed to- wards a fixed point, the motion is called central force motion. This type of motion is particularly relevant when studying the orbital movement of planets and satellites. The laws which gov- ern this motion were first postulated by Kepler and deduced from observation. In this lecture, we will see that these laws are a con- sequence of Newton's second law. An understanding of central

In this lecture, we consider the problem of a body in which the mass of the body changes during the motion, that is, m is a function of t, i.e. m(t). Although there are many cases for which this particular model is applicable, one of obvious importance to us are rockets. We shall see that a significant fraction of the mass of a rocket is the fuel, which is expelled during flight at a high velocity and thus, provides the propulsive force for the rocket

In this lecture, we will consider how to transfer from one orbit, or trajectory, to another. One of the assumptions that we shall make is that the velocity changes of the spacecraft, due to the propulsive effects, occur instantaneously. Although it obviously takes some time for the spacecraft to accelerate to the velocity of the new orbit, this assumption is reasonable when the burn time of the rocket is much smaller than the period of the orbit. In such cases, the Av required to do the maneuver is simply the difference between the

D244BD RIGID BODY DYNAMICS KINETIC EWEGY In echure we derwed am kinenc a susem u dm T= Fere ts the velouty relanve to G. for a nald body we ca wate Uing the vechor nidontklyAxB=Ax

In this lecture, we will derive expressions for the angular momentum and kinetic energy of a 3D rigid body. We shall see that this introduces the concept of the Inertia Tensor. Angular Momentum We start form the expression of the angular momentum of a system of particles about the center of mass

 一、非互斥项目相关概念  二、互斥组合法  三、线性规划法  四、净现值率法  五、电子表格的运用  （一）互斥组合法  （二）整数规划法  （三）净现值率法

A pendulum is a rigid body suspended from a fixed point (hinge) which is offset with respect to the body's center of mass. If all the mass is assumed to be concentrated at a point, we obtain the idealized simple pendulum. Pendulums have played an important role in the history of dynamics. Galileo identified the pendulum as the first example of synchronous motion, which led to the first successful clock developed

1.信息科学技术信息材料 2.新能源科学技术新能源材料 3.生物科学技术生物材料 4.空间科学技术空间技术用材料 5.生态环境科学技术环保材料 6.用高技术改造、更新现有材料,发展材料科学技术

• 一、公共项目及其经济分析的特点 • 二、从财务分析到经济分析 • 三、费用-效益分析 • 四、费用-效果分析 • 五、公用设施项目分析 • 六、公共项目的民间参与

第一节 设备更新概述 第二节 设备大修理的经济分析 第三节 设备更新的经济分析 第四节 设备租赁分析 第六节 改扩建和技术改造项目的财务评价