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

In this course we will study Classical Mechanics. Particle motion in Classical Mechanics is governed by Newton's laws and is sometimes referred to as Newtonian Mechanics. These laws are empirical in that they combine observations from nature and some intuitive concepts. Newton's laws of motion are not self evident. For instance, in Aristotelian mechanics before Newton, force was thought to be required in order

《工程热力学》课程教学资源（习题解答）第九章 气体动力循环

《工程热力学》课程教学资源（习题解答）第十章 蒸汽动力装置循环

运用FLAC有限差分程序,建立了一个边坡动力数值分析模型,对不同动力参数及岩土参数条件下的边坡响应规律进行数值模拟研究.结果表明,边坡动力响应放大系数与加载频率不是简单的线性关系,而是存在一个主导频率,即在该频率的动载作用下,边坡动力响应放大系数较大.进一步研究表明,主导频率主要受边坡岩土体剪切模量和密度的影响.提出了边坡动力响应放大系数与输入动力参数以及岩体力学参数间的函数关系

一、提高热效率 二、减小汽轮机低压缸尺寸,末级叶片变短

5-3斯特林( Stirling)循环 1816年提出,近20年才实施。 加热器回热器冷却器

华北电力大学（北京）：《工程热力学》课程教学资源（PPT课件讲稿）第十一章 蒸汽动力装置循环 steam power plant