Unit 5 - Air travel

WEATHER INSTRUMENTS • For the weather elements learnt, we use different instruments to measure and record them. • The instruments are: 1. A thermometer 2. A rain gauge 3. A wind vane 4. A cup anemometer 5. A hygrometer 6. A barometer 7. A Stevenson screen WEATHER INSTRUMENTS 1. Thermometer •It is used to measure temperature. •The unit of measurement is degrees Celcius (ᵒC). 2. Rain gauge •Is used to measure the amount of rainfall. •The unit of measurement is millimetres (mm). •In Zimbabwe more rains are experienced in summer. WEATHER INSTRUMENTS 3. Windvane •Used to determine the direction of the wind. •We always name the wind after the direction from which it blows. WEATHER INSTRUMENTS 4. Cup anemometer •It is used to measure wind speed. •It measures how quickly the set of cups turns around in a circle. •The unit of measurement is knots. 1 knot = 1.85km/hour WEATHER INSTRUMENTS 5. Barometer •It is used to measure atmospheric pressure. •Atmospheric pressure is the weight of the air on the earth. •If the pressure changes, it tells us that the weather is going to change. •High pressure means air is sinking and the weather will be clear. •Low pressure means the air is rising and there is a chance of rain. WEATHER INSTRUMENTS WEATHER INSTRUMENTS 6. Hygrometer •It is used to measure humidity. •Humidity is the amount of water vapour in the air

Electrostatics The section of CBSE Class 12 Physics electrostatic potential and capacitance notes mainly deals with the in-depth analysis of electromagnetic phenomena when they are not performing any movements. Additionally, it is divided into ten further sub-topics to study the companion processes of reaching the state. These are - 1. Electric charge In this section of Physics ch 2 Class 12 notes, you get to learn about the basic features of electric charge and its expression in Physics. Along with its basics, the sections help to understand the full potential of charge. Different aspects of Charge included in Class 12 Physics Chapter 2 notes are - Definition Type: Positive and Negative Charge Unit and dimensional formula Point Charge Properties of Charge Comparison of Charge and Mass Methods of Charging Electroscope 2. Coulomb's Law Force is created when charges of opposite signs attract each other, and they repulse if the signs are the same. Coulomb's law tries to define this phenomenon through a mathematical formula, explicitly mentioned in Physics Class 12 notes Chapter 2. Moreover, there is key information about the variation of the constant k and its effect on a medium. Coulomb's law's vector form and the principle of superimposition are also explained in ch 2 Physics Class 12 notes. (Image will be uploaded soon) 3. Electric Field As stated in Class 12 Physics Chapter 2 notes, every positively or negatively charged particle has their respective electric fields. It feels a force at the time of interaction which might be attraction or repulsion. As it arises from electric charge, it is crucial to know about its different parts like - Electric field intensity Relation between electric force and electric field Super imposition of electric field Point charge Continuous charge distributions Properties of Electric Field Lines Motion of Charged Particles in an Electric field Learning more about the electric field from electric potential and capacitance notes Class 12 helps a student to get a grasp of upcoming chapters. 4. Electric Potential Energy When energy helps a charge to move from an electric field, it is known as the Electric Potential Energy. This section of electrostatic chapter Class 12 notes requires a student to study the Electron volt (eV), and the potential energy that an n number of charges can hold. 5. Electric Potential This section of Class 12 Physics Chapter 2 notes focuses on in-depth learning of Electric Potential or Voltage. Basically, it defines the potential movement of energy. 6. Relation between Electric Field and Potential Apart from knowing more about the relationship between the two values, Physics Class 12 Chapter 2 notes also discuss equipotential surfaces. 7. Electric Dipole Essentially, 'Dipoles' are two opposite points of charge represented with q and –q, with their distance between each other being 2a. Electric Dipoles are crucial in your study of Physics Class 12 Chapter 2 notes to learn more about electric fields and their potential. Additionally, Class 12 Physics Chapter 2 notes focus on the influence of electric dipoles on a uniform electric field mainly through Force and Torque, Work, and Potential Energy. In the last part of Electrostatics, further focus is on using the formulas to their fullest potential. It includes subsections of Electric Field, Electric Potential Energy, Electric Potential, and Electric Dipole. In the notes for electrostatic potential and capacitance, you will find proper solutions accompanied by clear and crisp diagrams for better understanding. 8. Gauss's Law Apart from just discussing the Gauss's Law, in Physics Class 12 ch 2 notes there is a thorough explanation of its properties and applications. The Gauss' Law states that net electric flux passing through a hypothetical closed surface is equal to the net electric charge present within the same closed surface. Being a broad part of the whole chapter, you may need to spend a little more time on it. Moving forward, it starts discussing the properties of conductors in relation to Gauss's Law. The Class 12 Physics notes Chapter 2 perfectly defines the journey to Gauss' Law from Coulomb's Law. Here is the Gauss's Law present in the Class 12 Physics ch 2 notes, (image will be uploaded soon) 9. Capacitors There is a dedicated section about Capacitors in the Class 12 Physics Chapter 2 notes elucidating its functions and importance as storage of potential electric energy. After explaining the structure of a capacitor, it points out the different types, parallel plate, spherical and cylindrical. The section of Chapter 2 notes of Physics Class 12 is further divided into subheads like: Properties of an ideal battery Grouping of capacitors Simple circuits (Series and Parallel) Dielectric Van de Graaff generator Combination of drops Charge distribution method Wheatstone Bridge-based circuit Extended Wheatstone Bridge Infinite network of capacitors Redistribution of charge between two capacitors Vedantu prepares the Class 12 Physics Chapter 2 notes with help from subject matter experts. In the PDF, you get a comprehensive idea of the topic along with potential answers to the most asked questions. Furthermore, the detailed explanation on each section and subsections are written in a simple language allows a student to ace their exams with wholesome knowledge. These Physics Chapter 2 Class 12 notes are going to be one of the best supplementary study materials besides a student’s textbooks. Visit the Vedantu website or download the app to get your hands on all important notes! Important Questions A charge of 4 × 10–8C is uniformly distributed on the surface of a spherical conductor, having a radius of 15 cm. Determine the electric field just outside this sphere at a point that is 15 cm from the centre of this sphere. Determine the capacitance given that the distance between the two plates has been reduced by half and the parallel plate capacitor holds a capacitance of 20 pF (where 1pF = 10-12 F) having air between the two plates. What will be the total capacitance of a combination where three capacitors, each having a capacitance of 20 pF, are connected in series. A square having a side of 10 cm has a 500 µC charge at its centre. Determine the work done to move a charge of 10 µC between two points that are diagonally opposite each other on the square. At an equatorial point, what will be the electrostatic potential because of an electric dipole? Calculate the work done to move a test charge, q, through a length of 1 cm along the equatorial axis of an electric dipole? Polarisation A capacitor has its plates enclosed in a medium that can be filled by insulating substances. A net dipole moment is then induced by an electric field in the dielectric. This event causes the field in an opposite direction. Equipotential Surface An equipotential surface is a type of surface where the potential always has a constant value. If considered as a point charge, the concentric spheres that are centred at a particular area of this charge are basically equipotential surfaces. Advantages of Vedantu's Revision Notes: A Comprehensive Resource for Effective Learning There are several reasons why one may refer to Vedantu's revision notes for studying a subject like Electrostatic Potential and Capacitance. Here are some key points: Comprehensive Coverage: Vedantu's revision notes provide a comprehensive coverage of the entire topic, ensuring that all important concepts and subtopics are included. Concise and Organized: The notes are designed to be concise, focusing on the key points and core ideas. They are organized in a structured manner, making it easy for students to navigate and revise the content. Simplified Explanation: The revision notes offer simplified explanations of complex concepts, making them more accessible and easier to understand. This helps students grasp the material more effectively. Key Formulas and Equations: The notes highlight the key formulas and equations relevant to the topic, ensuring that students have a clear understanding of the mathematical aspects of Electrostatic Potential and Capacitance. Examples and Illustrations: Vedantu's revision notes often include examples and illustrations that help clarify concepts and provide practical applications, enabling students to better relate theory to real-world scenarios. Quick Recap: The revision notes serve as a quick recap of the important points, allowing students to review the material efficiently before exams or assessments. Exam-Oriented Approach: Vedantu's revision notes are designed with an exam-oriented approach, focusing on the topics and concepts that are frequently asked in examinations. This helps students prepare effectively and increase their chances of scoring well. Accessible Anytime: Vedantu's revision notes are easily accessible online, allowing students to study at their convenience and revise the material anytime, anywhere.

THE BATTLE OF THE PHILIPPINE SEA Occured in the Philippine Sea and Marinas The battle engaged the bulk of thepagan American forces, and prevented the Japanese from reinforcing, their fleet in the •Marianas. •A month after, the Japanese LOST THEIR 4 best aircraft carriers in the Battle of Midway, an island northwest of Pearl "Harbor. 1. The Batle of the Philipine Sea lasted just one day June 19- June 20 1944 3. is also called the "Marianas Turkey Shoot” The Battle of the Coral Sea The Coral Sea is Between New Guinea and Australia The Japanese Were Trying to Attack Australia! The U.S. Navy and the Japanese Navy Fought! Nobody Won! U.S. Was Able to STOP the Attack on Australia! (Victory!) The American fleet defeated the Japanese. American planes bombarded Japanese installation in Manila from the air. Air strikes were also carried out in the Visayas. Battle of Okinawa: Battle Details The attack on Okinawa took heavy toll on both sides of the fighting... The Americans lost 7,373 men killed and 32,056 wounded on land. At sea, the Americans lost 5,000 killed and 4,600 wounded. The Japanese lost 107,000 killed and 7,400 men taken prisoner. The Japanese may have lost another 20,000 dead as a result of American tactics whereby Japanese troops were incinerated where they fought. The Americans also lost 36 ships. 368 ships were also damaged. 763 aircraft were destroyed. The Japanese lost 16 ships sunk and over 4,000 aircraft were lost. battle facts -the japanese launched fierce kamikaze attacks l-arge amouunts of civillian deaths -japanese soldiers using civilians as human shields Americans ended with more triumphs in the battles like in: General MacArthur and the Allies next turned to the Island of Iwo Jima The island was critical to the Allies as a base for an attack on Japan It was called the most heavily defended spot on earth Allied and Japanese forces suffered heavy casualties IWO JIMA American soldiers plant the flag ol the Island of Iwo Jima after their victory Battle of Leyte Gulf "Second Battle of the Philippine Sea". Time: October 23 - 26, 1944 during WW. Location: Leyte Gulf in Philippines (East coast), Philippine islands of Leyte, Samar, and Luzon. Largest naval battle in WWII. Leyte was secured and was liberated from the hands of the Japanese Americans decided to launch their attack in Leyte since the weak side of the Japanese fleet was in Visayas. Heavy bombing at the Leyte beaches cleared the way for the landing in Palo, Leyte. Leading the American troops were General Douglas MacArthur and President Osmeña, who took over after the death of President Quezon in Saranak Lake in New York. the battle for the liberation of manila The commonwealth government capital was transferred from tacloban to Manila. Manila once again became the seat of the national leadership. ON july 4, 1945, general macarthur announced the total liberation of the Philippines • The Commonwealth government capital was transferred from Tacloban to Manila. Manila once again became the seat of the national leadership. On July 4, 1945, General MacArthur announced the total liberation of the Philippines. Americans surprised the Japanese with the landing of troops in Lingayen Gulf in Pangasinan. • The Filipino guerillas had already cleared the area and neutralized many of the Japanese forces. The first target was the UST, which was used by the Japanese as a camp for civilian prisoners of war, and they were able to free them. • More than 1000 POWs from Bataan and Corregidor were also freed from the Bilibid Prisons. • The battle of Manila was recorded as the fiercest urban fighting in the entire Pacific War. WATERLOO DAILY COURIER-NEWSPAPER “PEACE! WAR ENDS; JAPANESE ACCEPT ALLIED TERMS. ON EMPEROR" On August 6, due to persistent refusal of Japan to yield, another atomic bomb was dropped in the shipbuilding city of Nagasaki. On August 15, V-J Day (Victory in Japan), Emperor Hirohito finally admitted defeat and on September 3, 1945 the document of surrender was signed on board of the U.S. battleship Missouri in Tokyo Bay. With the liberation of the Philippines, the Americar troops moved on to finally end the war in Asia. The Japanese cities of Tokyo, Osaka, Nagoya and Kure were bombed. In July 26, the allies demanded surrender but the Japanese continued to hold on to their belief that surrender is a dishonor. Atomic bomb was dropped on the populous city of Hiroshima, 60% of the city was destroyed. It was estimated that there were more than 80 000 people died on the spot and more than 37 000 suffered severe injuries. Today, the HIROSHIMA SHRINE serves as a reminder of th horrors of war and the need to preserve PEACE in the world. THE POSTWAR PHILIPPINE COMMONWEALTH-• Philippine Commonwealth resumed. Osmeña was confronted with a war - ravaged country with no financial resources for PROBLEMS • Poverty • Destruction of Properties • Unemployment • Price Increase • Hoarding • Graft and Corruption HINDRANCES -Rehabilitation of INDUSTRIES COULD NOT BE DONE BECAUSE OF LACK OF FUND -RAILWAYS WERE DESTROYED THAT LED TO SLOW PRODUCTION AND TRANSPORTATION SOLUTION -PCAU (Philippine Civil Affairs Unit) was established by MacArthur to provide emergency relief in areas liberated by the Americans. - It organized food distribution centers. CHALLENGES TO INDEPENDENCE • On April 30, 1946, the Philippine the US President. BIASED AGREEMENTS: Rehabilitation or the Tydings Act of 1946, passed by the US Congress, was approved by Commission • This Act created the US Philippine War Damage The Act also provided for the transfer of $100,000,000 surplus property of the United States to the Philippines. The Philippine Armed Forces received large quantities of valuable military equipment and supplies. BIASED AGREEMENTS: • The United States Congress offered $800 million for post World War Il rebuilding funds if the Bell Trade Act was ratified by the Philippine Congress Parity rights granting U.S. citizens and corporations rights to Philippine natural resources equal to (in parity with) those of Philippine citizens The Philippines used to celebrate its Independence Day on July 4, and not June 12, by virtue of the Truman Proclamation in 1946. In the early 1960s, however, the Philippine Historical Association lobbied to bring back June 12 as our Independence Day. In 1962, President Diosdado Macapagal issued a proclamation to make the change official. DECLARATION OF PHILIPPINE INDEPENDENCE • On July 4, 1946, the Americans granted independence to the Philippines.

CHARACTERISTICS OF LIFE The world is filled with familiar objects, such as tables, rocks, plants, pets, and automobiles. Which of these objects are living or were once living? What are the criteria for assigning something to the living world or the nonliving world? Biologists have established that living things share seven characteristics of life. These characteristics are organization and the presence of one or more cells, response to a stimulus (plural, stimuli), homeostasis, metabolism, growth and development, reproduction, and change through time. Organization and Cells Organization is the high degree of order within an organism’s internal and external parts and in its interactions with the living world. For example, compare an owl to a rock. The rock has a spe- cific shape, but that shape is usually irregular. Furthermore, differ- ent rocks, even rocks of the same type, are likely to have different shapes and sizes. In contrast, the owl is an amazingly organized individual, as shown in Figure 1-2. Owls of the same species have the same body parts arranged in nearly the same way and interact with the environment in the same way. Copyright © by Holt, Rinehart and Winston. All rights reserved. ORGANISM (Barn Owl) ORGAN (Owl’s Ear) TISSUE (Nervous Tissue Within the Ear) CELL (Nerve Cell) Every living organism has a level of organization. The different levels of organization for a complex multicellular organism, such as an owl, are shown in the figure below. FIGURE 1-2 THE SCIENCE OF LIFE 7 All living organisms, whether made up of one cell or many cells, have some degree of organization. A cell is the smallest unit that can perform all life’s processes. Some organisms, such as bacteria, are made up of one cell and are called unicellular (YOON-uh-SEL-yoo-luhr) organisms. Other organisms, such as humans or trees, are made up of multiple cells and are called multicellular (MUHL-ti-SEL-yoo-luhr) organisms. Complex multicellular organisms have the level of orga- nization shown in Figure 1-2. In the highest level, the organism is made up of organ systems, or groups of specialized parts that carry out a certain function in the organism. For example, an owl’s ner- vous system is made up of a brain, sense organs, nerve cells, and other parts that sense and respond to the owl’s surroundings. Organ systems are made up of organs. Organs are structures that carry out specialized jobs within an organ system. An owl’s ear is an organ that allows the owl to hear. All organs are made up of tissues. Tissues are groups of cells that have similar abilities and that allow the organ to function. For example, nervous tissue in the ear allows the ear to detect sound. Tissues are made up of cells. A cell must be covered by a membrane, contain all genetic information necessary for replication, and be able to carry out all cell functions. Within each cell are organelles. Organelles are tiny structures that carry out functions necessary for the cell to stay alive. Organelles contain biological molecules, the chemical compounds that provide physical structure and that bring about movement, energy use, and other cellular functions. All biological molecules are made up of atoms. Atoms are the simplest particle of an ele- ment that retains all the properties of a certain element. Response to Stimuli Another characteristic of life is that an organism can respond to a stimulus—a physical or chemical change in the internal or external environment. For example, an owl dilates its pupils to keep the level of light entering the eye constant. Organisms must be able to respond and react to changes in their environment to stay alive. ORGANELLE (Mitochondrion) BIOLOGICAL MOLECULE (Phospholipid) ATOM (Oxygen) cell from the Latin, cella meaning “small room,” or “hut” Word Roots and Origins www.scilinks.org Topic: Characteristics of Life Keyword: HM60257 mb06se_bios01.qxd 5/18/07 10:37 AM Page 7 8 CHAPTER 1 Homeostasis All living things, from single cells to entire organisms, have mecha- nisms that allow them to maintain stable internal conditions. Without these mechanisms, organisms can die. For example, a cell’s water content is closely controlled by the taking in or releas- ing of water. A cell that takes in too much water will rupture and die. A cell that doesn’t get enough water will also shrivel and die. Homeostasis (HOH-mee-OH-STAY-sis) is the maintenance of a stable level of internal conditions even though environmental conditions are constantly changing. Organisms have regulatory systems that maintain internal conditions, such as temperature, water content, and uptake of nutrients by the cell. In fact, multi- cellular organisms usually have more than one way of maintain- ing important aspects of their internal environment. For example, an owl’s temperature is maintained at about 40°C (104°F). To keep a constant temperature, an owl’s cells burn fuel to produce body heat. In addition, an owl’s feathers can fluff up in cold weather. In this way, they trap an insulating layer of air next to the bird’s body to maintain its body temperature. Metabolism Living organisms use energy to power all the life processes, such as repair, movement, and growth. This energy use depends on metabolism (muh-TAB-uh-LIZ-uhm). Metabolism is the sum of all the chemical reactions that take in and transform energy and materials from the environment. For example, plants, algae, and some bacteria use the sun’s energy to generate sugar molecules during a process called photosynthesis. Some organisms depend on obtaining food energy from other organisms. For instance, an owl’s metabolism allows the owl to extract and modify the chemi- cals trapped in its nightly prey and use them as energy to fuel activities and growth. Growth and Development All living things grow and increase in size. Some nonliving things, such as crystals or icicles, grow by accumulating more of the same material of which they are made. In contrast, the growth of living things results from the division and enlargement of cells. Cell division is the formation of two new cells from an existing cell, as shown in Figure 1-3. In unicellular organisms, the primary change that occurs following cell division is cell enlargement. In multi- cellular life, however, organisms mature through cell division, cell enlargement, and development. Development is the process by which an organism becomes a mature adult. Development involves cell division and cell differen- tiation, or specialization. As a result of development, an adult organism is composed of many cells specialized for different func- tions, such as carrying oxygen in the blood or hearing. In fact, the human body is composed of trillions of specialized cells, all of which originated from a single cell, the fertilized egg. This unicellular organism, Escherichia coli, inhabits the human intestines. E. coli reproduces by means of cell division, during which the original cell splits into two identical offspring cells. FIGURE 1-3 Observing Homeostasis Materials 500 mL beakers (3), wax pen, tap water, thermometer, ice, hot water, goldfish, small dip net, watch or clock with a second hand Procedure 1. Use a wax pen to label three 500 mL beakers as follows: 27°C (80°F), 20°C (68°F), 10°C (50°F). Put 250 mL of tap water in each beaker. Use hot water or ice to adjust the tem- perature of the water in each beaker to match the temperature on the label. 2. Put the goldfish in the beaker of 27°C water. Record the number of times the gills move in 1 minute. 3. Move the goldfish to the beaker of 20°C water. Repeat observations. Move the goldfish to the beaker of 10°C. Repeat observations. Analysis What happens to the rate at which gills move when the temp- erature changes? Why? How do gills help fish maintain homeostasis? Quick Lab mb06se_bios01.qxd 5/18/07 10:37 AM Page 8 THE SCIENCE OF LIFE 9 Reproduction All organisms produce new organisms like themselves in a process called reproduction. Reproduction, unlike other characteristics, is not essential to the survival of an individual organism. However, because no organism lives forever, reproduction is essential for the continuation of a species. Glass frogs, as shown in Figure 1-4, lay many eggs in their lifetime. However, only a few of the frogs’ off- spring reach adulthood and successfully reproduce. During reproduction, organisms transmit hereditary informa- tion to their offspring. Hereditary information is encoded in a large molecule called deoxyribonucleic acid, or DNA. A short segment of DNA that contains the instructions for a single trait of an organism is called a gene. DNA is like a large library. It contains all the books—genes—that the cell will ever need for making all the struc- tures and chemicals necessary for life. Hereditary information is transferred to offspring during two kinds of reproduction. In sexual reproduction, hereditary information recombines from two organisms of the same species. The resulting offspring are similar but not identical to their parents. For example, a male frog’s sperm can fertilize a female’s egg and form a single fer- tilized egg cell. The fertilized egg then develops into a new frog. In asexual reproduction, hereditary information from different organisms is not combined; thus the original organism and the new organism are genetically the same. A bacterium, for example, reproduces asexually when it splits into two identical cells. Change Through Time Although individual organisms experience many changes during their lifetime, their basic genetic characteristics do not change. However, populations of living organisms evolve or change through time. The ability of populations of organisms to change over time is important for survival in a changing world. This factor is also impor- tant in explaining the diversity of life-forms we see on Earth today.

Unit 5

unit : 5

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