In lecture D2 we introduced the position velocity and acceleration vectors and referred them to a fixed cartesian coordinate system. While it is clear that the choice of coordinate system does not affect the final answer, we shall see that, in practical problems, the choice of a specific system may simplify the calculations considerably. In previous lectures, all the vectors at all points in the trajectory were expressed in the

In this lecture, we will revisit the principle of work and energy introduced in lecture D7 for particle dynamics, and extend it to 2D rigid body dynamics. Kinetic Energy for a 2D Rigid Body We start by recalling the kinetic energy expression for a system of particles derived in lecture D17

In this lecture, we consider the motion of a 3D rigid body. We shall see that in the general three dimensional case, the angular velocity of the body can change in magnitude as well as in direction, and, as a consequence, the motion is considerably more complicated than that in two dimensions. Rotation About a Fixed Point We consider first the simplified situation in which the 3D body moves in such a way that there is always a point, O, which is fixed. It is clear that, in this case, the path of any point in the rigid body which is at a

Definition Cyanosis refers to bluish(带蓝色的 带青色的) color of the skin and mucous membranes resulting from an increased quantity of reduced hemoglobin(亚铁血 红蛋白;还原血红蛋白),orof hemoglobin derivatives, in the small blood vessels of those areas. It is usually most marked in the lips, nail beds(甲床),ears, and malar (颧骨的;颊的) eminences

Physical examination It is the process of examining the patient's body to determine the presence or absence of physical problems The goal of the physical examination is to obtain valid information concerning the health of the patient The examiner must be able to identify, analyze

It is well known that advances in scientific medicine have occasionally threatened to displace the history and physical examination in the evaluation of the patient. However, we usually discover that technologic advances serve to make the physical examination more rational and provide new understanding or objective documentation of long- appreciated physical finding

Causation and Treatment Professor of Obstetrics, Northwestern University Medical School Jos. B. De Lee Published in Medicine (Detroit) 3: 643-660, 1897. The highest mortality that befalls the human race in one day occurs on the day of birth. It is said that the most important period of the life of a human being is the time spent in utero. The most trying ordeal a human being sustains is the ordeal of birth

Intensive Study Marriage Across the Nations Para. 1 Gail and I imagined quiet wedding. During our two years together we had experienced the usual ups and downs of a couple learning to know, understand, and respect each other. But through it all we had honestly confronted the

Section A: Learning a Foreign Language(4 hours) Section B: Keys to Successful Online learning (2 hours) The texts are used as inputs (for output), stimuli (for response), prompts(for thinking) Teaching Objectives: This unit is intended to introduce you to studying by computer. After learning it, Ss should be able to

This unit is intended to explore other ways of good communication (nonverbal communication) in addition to words, feelings and senses. After learning it, Ss are expected to have better understanding about how master as well as to pressent good communication signs in an Engllish culture, such as apperance, eye contact, gestures, movements, etc