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

生产过程 是指从准备生产开始，直到此 产品产出的全过程，是劳动者借助于劳 动资料直接或间接的作用于劳动对象， 使之成为产品的全过程。 医药企业的生产过程，主要包括生产准 备过程、基本生产过程、辅助生产过程、 生产结束清场与清洗和生产服务过程

劳动定额 1．劳动定额的作用 劳动定额是在一定的生产技术和合理的劳动组织 条件下，为生产一定的产品或完成一定的工作所 规定的必要劳动量的标准

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

中药制剂是指将中国的中药（包括中药材或饮片及其 方剂）制成用一防病、治病目的并适合于患者应用的 制剂。 中药是指以中医药传统理论体系表述药物性、功效和 使用规律，按其理论指导应用的药物，所以也称传统 （中）药

§1概述 §2葡萄酒厂工艺设计的基本内容 §3产品方案的确定 §4工艺流程的制定 §5物料衡算 §6生产车间工艺设备的选择 §7 生产车间的工艺布置 §8生产过程用水和蒸汽量的估算 §9向非工艺设计提供设计条件 §10工艺设计文件的编制

§ 1厂址选择 当葡萄酒厂建设项目确定之后，首要的问题是根据项目规模的大小，选择建厂地址。 厂址选择工作内容和工作组织 厂址选择原则 厂址选择报告 § 2萄酒厂布置设计

 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