Talim by Zia Ur Rehman Sherwani.

What is difference between angular acceleration and centripetal force? How moment of inertia is related to torque? An elevator starts up from the basement with initial acceleration of 16m/sec² will the passenger's apparent Bwl-17 Sgd-16 weight be increased, decreased or remain same. An elevator moving down when suddenly the chain of the elevator breaks. Two different bodies appear to Lhr-17 having the same weight. What is the real weight and why? SECTION II ot any 3 (three) questions. Mul-16 Explain the angular momentum? Differentiate between spin angular momentum and orbital angular momentum? Explain law of conservation of angular momentum (5) What is least speed at speed at which an aero plane can execute a vertical loop of 1.0km radius so that there is no tendency for the pilot to fall down at the highest point? Dgk-15,17, Lhr-16, Bwl-16, Guj-18 What do you mean by instantaneous angular acceleration? Calculate centripetal force. (5) Radio and TV signals bounce from a synchrono...

3. GASES 3.1 STATES OF MATTER Matter exists in four states i.e., solid, liquid, gas and plasma. The simplest form of matter is the gaseous state and most of matter around on is in the solid state. Liquids are less common than solids, gases and plasmas. The reason is that the liquid state of any substance can exist only within a relatively narrow range of temperature and pressure. Let us look at the general properties of gases, liquids and solids. Kinetic molecular theory of gases can help us understand their properties. 1. Gases don't have a definite volume and occupy all the available space. The volume of a gas is the volume of the container. 2. They don't have a definite shape and take the shape of the container just like liquids. 3. Due to low densities of gases, as compared to those of liquids and solids, the gases bubble through liquids and tend to rise up. 4. Gases can diffuse and effuse. This property is negligible in solids but operates in liquids as well. 5. Gases ...

1.BASIC CONCEPTS 1.1 ATOM Long time ago, it was thought that matter is made up of simple, indivisible particles. Greek philosophers thought that, matter could be divided into smaller and smaller particles to reach a basic unit, which could not be further sub-divided. Democritus (460-370 B.C.) called these particles atomos, derived from the word "atomos" means indivisible. However, the ideas of Greek philosophers were not based on experimental evidences. In the late 17th century, the quantitative study of the composition of pure substances disclosed that a few elements were the components of many different substances. It was also investigated that how, elements combined to form compounds and how compounds could be broken down into their constituent elements. In 1808, an English school teacher, John Dalton, recognized that the law of conservation of matter and the law of definite proportions could be explained by the existence of atoms. He developed an atomic theory; the main...