Notes, summaries, assignments, exams, and problems for Secondary education

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1. Stopwatch Accuracy

a) Stopwatch

b) To have more accuracy

c) i) 3rd

ii) (3.93 + 4.07 + 3.99) / 3 = 11.99 / 3 = 4

iii) 4 / 10 = 0.40

2. Water Speed Measurement

a) First, measure the distance between bridge X and bridge Y. Then, place the stick in the water at bridge X and time how long it takes to reach bridge Y. Calculate the speed by dividing the distance by the time. Repeat this process at least three times. Add all the results together and divide by three to get the average speed.

b) 2nd box

3. Acceleration and Force

a) i) 24 / 60 = 0.4 m/s²

ii) 7.5 × 10⁵ × 0.4 = 300,000 N

b) Speeding up / Slowing down / Steady speed / At rest

4. Resultant Force and Density

a) i) 280 - 250 = 30 N

ii) Up

b)... Continue reading "Physics Exam Answers and Explanations" »

The Rise of the Bourgeoisie and Industrial Change

What changes led to the industrial and bourgeois revolution?

The development of businesses increased the wealth of the bourgeoisie, surpassing the traditionally wealthy nobility and clergy whose wealth was based on land ownership. This shift in economic power led to increased social and political influence for the bourgeoisie, despite their unequal treatment as members of the Third Estate.

What were the two new production systems?

• Domestic System: Organized by merchants who supplied artisans with raw materials, collected finished products, and managed their sale.
• Manufacturing: Large workshops employing numerous artisans to produce weapons and luxury items like glass.

Population Growth and Agricultural

Natural Disasters and Extreme Weather

Natural Disasters and Extreme Weather Events:

• Avalanche
• Blizzard/Snowstorm
• Downpour
• Drought
• Dust Storm
• Earthquake
• Epidemic
• Flood/Flash Flood
• Forest Fire/Wildfire
• Hail
• Heatwave
• Hurricane
• Gust
• Landslide
• Thunderstorm
• Tornado
• Torrential Rain
• Tsunami
• Gale
• Volcanic Eruption

Words Connected with Natural Disasters:

• Aftershock (n)
• Aid (n)
• Ash (n)
• Casualty (n)
• Collapse (v)
• Debris (n)
• Destruction (n)
• Devastating (adj)
• Evacuate (v)
• Evacuee (n)
• Molten Lava (n)
• Put Out (phrasal verb)
• Relief Worker (n)
• Spread Through/Across (phrasal verb)
• Supply (n, v)
• Survivor (n)
• Sweep Down (v)
• Tremor (n)
• Victim (n)

Prepositional Verbs:

• Agree with
• Apologise for (something)
• Arrive at/in
• Believe in
• Belong to
• Complain about
• Depend on
• Dream of
• Listen to
• Protect (somebody/something) from

Key Concepts of the Cold War Era

Defining the Cold War

The Cold War was a period of intense rivalry and tension between the United States (U.S.) and the Union of Soviet Socialist Republics (USSR). During this era, the U.S. and USSR engaged in a nuclear arms race, the Space Race, and formed opposing military alliances: NATO (North Atlantic Treaty Organization) and the Warsaw Pact.

Understanding Decolonization

Decolonization was a historical process through which Asian and African colonies of European empires gained independence. This occurred primarily from 1947 to 1975, coinciding with the Cold War and marking the beginning of the Third World. While new states achieved political freedom, they often remained economically dependent on their former... Continue reading "Cold War & Decolonization: Key Events and Concepts" »

Chromosomes and DNA

Genes are contained within chromosomes, which are made of DNA and located in the cell nucleus. A chromosome contains thousands of genes. Every normal human contains 23 pairs of chromosomes, a total of 46 chromosomes.

Traits and Alleles

A trait is any gene-determined characteristic, often determined by more than one gene. Gene: A segment of DNA that controls a hereditary trait. Alleles are different versions of a gene that produce distinguishable traits in offspring. Two alleles must be present in order for a trait to appear in the offspring. One allele is provided by each parent to the offspring. When fertilization of sperm and eggs occurs, the new offspring will have 2 alleles for each gene.

Gregor Mendel's Contributions

Gregor... Continue reading "Genetics: The Basics of Heredity and Traits" »

Diana, Princess of Wales

Diana of Wales:

She was a British aristocrat, the first wife of Charles, Prince of Wales, with whom she had two sons, William and Henry. She was recognized for her participation in favor of the care and social integration of AIDS patients and her campaign for the elimination of landmines.

AIDS Advocacy and Public Impact

Diana shook hands with a sick man; thanks to this she changed the world’s perception of AIDS and HIV at a time when people who suffered from this condition were rejected by society and separated.

Landmine Campaign and HALO Trust

She was also a supporter of the HALO Trust. In January 1997, pictures of Diana touring a minefield wearing a helmet and bulletproof vest were seen around the world. During her campaign,... Continue reading "Diana and Malala: Humanitarian Impact, AIDS Care and Education" »

Excretory System Notes

Excretion

Excretion: Process of eliminating waste substances from metabolic reactions.

Although the kidneys are the main organs of excretion, several other organs also excrete wastes. They include the liver, skin, and lungs. All of these organs of excretion, along with the kidneys, make up the excretory system. This lesson focuses on the role of the kidneys in excretion. The roles of the other excretory organs are summarized below:

• Kidneys: Responsible for filtering the blood and forming urine.
• Lungs: Expel carbon dioxide produced during cell respiration.
• Sweat glands: Excrete sweat, a liquid with a composition similar to urine.
• Liver: Expels waste that comes from toxins, medicines, and digestion of food.

Urinary System

The kidneys... Continue reading "Excretory System and Kidney Function: Urine, Nephrons, Diseases" »

The Cold War: Key Policies and Events

The Cold War was a period of geopolitical tension between the United States and the Soviet Union and their respective allies. Here's a look at some key events and policies:

The Truman Doctrine

Introduced in 1947 by President Harry Truman, the Truman Doctrine aimed to defend democracies against the spread of communism.

The Marshall Plan

Also introduced in 1947, the Marshall Plan was designed to help European countries rebuild their economies after World War II.

NATO - North Atlantic Treaty Organization

Established in 1949, NATO is a military alliance between the USA and Western Bloc countries.

The Warsaw Pact

Formed in 1955, the Warsaw Pact was a military alliance between the USSR and Eastern Bloc countries, including... Continue reading "Cold War: Truman Doctrine, Marshall Plan, and Key Events" »

Essential English Vocabulary and Grammar

Phrasal Verbs and Idioms for Finance

Vocabulary related to money, spending, and saving:

• Take out (money) → Sacar/Extraer dinero
• Cost an arm and a leg → Cuesta un riñón (Muy caro)
• Snap up a bargain → Comprar un chollo (Una ganga muy buena)
• Spend a fortune on → Gastarse un dineral en
• Throw money down the drain → Desperdiciar dinero / Tirar el dinero
• Tighten your belt → Apretar el cinturón (Reducir gastos)
• Come to → Llegar a una conclusión / Suma total de una cantidad
• Chip in → Aportar / Contribuir con dinero
• Cut down on → Reducir / Reducir el consumo de algo
• Get by → Arreglárselas / Sobrevivir / Pasar
• Pay back → Reembolsar / Devolver dinero
• Rip off → Timar / Estafar / Robar
• Run out of →

Discrete Random Variables

Discrete random variables are variables that can take on a finite number of distinct values. In simpler terms, a discrete random variable is a set of possible outcomes that is countable.

Continuous Random Variables

Continuous random variables are random variables that take an infinitely uncountable number of potential values, typically measurable amounts.

Example

1. List the sample space in the given experiment. How many outcomes are possible?

The sample space is: S = {NNN, NND, NDN, NDD, DNN, DND, DDN, DDD}

2. Count the number of defective keyboards in each outcome in the sample space and assign this number to the outcome. For instance, if you list NND, then the number of defective keyboards is 1.

The possible values of X are 0,... Continue reading "Introduction to Statistics: Discrete and Continuous Random Variables, Probability Distributions, and Sampling Techniques" »