Wednesday, 10 June 2015

Physics - Electromagnetic Spectrum

The electromagnetic spectrum

The electromagnetic spectrum is a continuous range of wavelengths. The types of radiation that occur in different parts of the spectrum have different uses and dangers - depending on their wavelength and frequency.

Refraction from a prism
The order of electromagnetic waves in the spectrum is shown in the table.
EnergyFrequencyWavelengthRadiation typeTypical use
LowestLowestLongestRadio wavesTelevision signals
MicrowavesCooking, mobile phones
InfraredOptical fibre communication
Visible lightSeeing
UltravioletDetecting forged bank notes
X-raysMedical images of bones
HighestHighestShortestGamma radiationKilling cancer cells
Radio waves have the lowest frequencies and longest wavelengths, while gamma waves have the highest frequencies and shortest wavelengths.
All of these waves travel at the same speed in free space, which is the speed of light or about 300,000,000 m/s (metres per second).

Tuesday, 9 June 2015

Physics - Electricity and Wiring


Electrical hazards

Electricity is a useful form of energy but it can also be very dangerous. There are lots of ways in which we can be electrocuted including:
  • touching frayed electrical cables 
  • long or overheating cables
  • damaged or incorrectly wired plugs
  • allowing water or wet objects to enter plug sockets or touch frayed cables
  • pushing metal objects into plug sockets


The plug

The cable

A mains electricity cable contains two or three inner wires. Each has a core of copper, because copper is a good conductor of electricity. The outer layers are flexible plastic, because plastic is a good electrical insulator. The inner wires are colour coded and have different functions:
ColourWireFunction
BrownLiveIs held at a voltage of 230 V and provides the current
BlueNeutralCompletes the circuit
Green and yellow stripesEarthA safety wire to stop the appliance becoming live
An earthed conductor cannot become live.

The wires

In a plug, the blue neutral wire goes to the left, the brown live wire to the right and the green and yellow striped earth wire to the top. The fuse fits next to the live wire.
The diagram shows the key features of a three-pin mains plug:
The inside of a plug showing the positioning of the earth, neutral and live wires, as well as the fuse and cable grip.

Where does each wire go?

There is an easy way to remember where to connect each wire. Take the second letters of the words blue, brown and striped. This reminds you that when you look into a plug from above:
  • blue goes left
  • brown goes right
  • striped goes to the top

(All information courtesy of BBC Bitesize)

Physics - Speed, Velocity, Acceleration

Average speed

When an object moves in a straight line at a steady speed, you can calculate its average speed if you know how far it travels and how long it takes. The following equation shows the relationship between average speed, distance moved and time taken:
Equation: average~speed = frac{distance~moved}{time~taken}
where:
average speed is measured in metres per second, m/s
distance moved is measured in metres, m
time taken is measured in seconds, s
For example, a car travels 300 m in 20 s. Its average speed is:
300 ÷ 20 = 15 m/s
(Notes are courtesy of BBC Bitesize)

Monday, 8 June 2015

Latin - avunculus meus - A Day in the Life of Pliny The Elder (Taken from Cambridge Latin Anthology)

Latin - Pliny Set Text

1) 'avunculus meus' - A Day in the Life of Pliny The Elder

Before dawn, he used to go to the Emperor of Vespasian (for that man used to make use of the nights), then he went to the official duty signed to himself.

Having returned home, he gave the remaining time to study.

Often after food, (which, as per the cut of his forefathers, was light and simple during the day), in Summer, if there was any measure, he used to lie in the sun, a book was being read, of which he made notes and took down extracts; he was even accustomed to say that there was no book so bad that it was of no use in any part.

After his sun, he was usually bathed in cold water, then he used to have a snack and sleep a little; soon, as if on another day, he used to study till dinner time.

Over dinner, a book was being read, and, indeed, he was making notes rapidly.

He did these things amid the middle of his public duties and the bustle of the city.

Away from the city, the only time taken away from his studies was for bathing.

When I say 'the baths', I'm speaking of the inner-rooms. For while he was being rubbed down and dried, he used to listen to something or was dictating. On a journey as if released from the rest of his concerns, he used to make time for this 1 care.

A secretary was at his side with a book and writing tablets, the hands of whom were being protected in Winder with long sleeves, so that not even indeed the harshness of the weather would take any time away from study.

For this reason also, he was carried by a Sedam chair at Rome.

I remember that I was scolded by him because I used to walk: 'You would be able', he said, 'not to waste these hours'; for he used to think that all time was wasted that was not spent in study.

Goodbye.

Notes:

  • This piece is a letter written by Pliny the Elder's nephew (Pliny the Younger) to Baebius Macer
    • LINE 1: Vespasian ruled as emperor from 69-79AD
    • 2-3: officium...delegatum: this was the prefecture of the fleet at Misenum
    • 3: P. the E. had a house at Misenum, but spent most of his time administering the fleet from Rome.
    • 4: cibum - this is a light breakfast
    • 5-6: liber legebatur - books would be read by an educated slave; the notes + extracts would be made by another slave
    • 7: exceperet - such note taking from the words of other writers was quite normal at this time
    • 9: gustabat - the gustation was usually taken before bathing, but Pliny was in the habit of bathing first
    • 10: dormiebat: the midday siesta was taken about the 7th hour, after sunrise
    • 10: alio die - this is evidence that the standard working day for men of Pliny's class was over by Midday
    • 13: medio labores/fremitum urbis - Pliny's dedication to study is even more remarkable given how busy he is with official duty, and how distracting life in Rome is
    • 14: The bracketed section further adds to Pliny's picture of his uncle's devotion to study
    • 15: interioribus: inner chambers, where the washing itself took place
    • 18: hieme: even the winder does not stop Pliny from studying!
    • 20: sella - a Sedam chair: wheeled carriages were banned from the streets of Rome during the day
    • 21-22: the use of a quotation (direct speech) from his uncle enlivens the text







Physics - Astronomy

Physics - Astronomy

Definitions:

Star: Massive, luminous ball of plasma; held together by gravity; shining due to thermonuclear fusion. (EG: the Sun)

Planet: A body large enough to be rounded by its own gravitational pull and held in orbit by the gravitational attraction between the planet and its star. (EG: Jupiter)

Moon: A natural satellite of a planet; held by the gravitational attraction between the Moon and its planet. (EG: Enceladus, one of Saturn's moons)

Asteroid: Lumps of rock from several metres up to a 100km. (EG: The asteroid belt between Mars & Jupiter)

Comet: Has a nucleus of ice/dust/rock; from a few hundred metres up to tens of km; usually have an elliptical orbit, with the Sun not at its centre. (EG: Halley's comet)

Meteoroid: From sand to boulder sized debris; meteor = shooting star (EG: The Perseid shower); meteorite = solid matter that lands (EG: Hoba, the largest known meteorite)

  • The Solar System is around 4.6 billion years old
    • We know this through radiodating, using the half life of uranium
  • An accretion disc is a spinning cloud flattened into a disc
    • An accretion disc contains H, He (+water, ice, methane, ammonia, and rocky material)
    • Accretion discs grew via collisions with other fragments
  • Jupiter and Saturn were the first planets formed

Sunday, 7 June 2015

Divinity - Crash Course To Exam Technique

Divinity - Crash Course To Exam Technique

There are 3 main approaches to ethical decisions: Conservative Protestant Christians, Liberal Protestant Christians, and Roman Catholic Christians

Conservative Protestant Christians make moral decisions based mainly on the teachings of the Bible. So, if you were to include a Cons. Prot. Christians point of view in your answer, then make sure to quote the Bible.

Liberal Protestant Christians follow agape (the most loving thing to do), the situation (the conditions which surround the matter), the 'lesser of two evils' argument, conscience, and the Bible. Quoting the Bible is certainly one good way to support a Liberal point of view, but be sure to use agape in your answer, too.

Roman Catholics make their moral decisions based on the Bible, teachings of the church, and Natural Law. Anything which is not natural contradicts Catholic beliefs, and therefore, Natural Law is worth putting in your answer. 

Mark Scheme

Follow PEA. Make your point, support it with evidence (either from the Bible, Agape, Natural Law, or any other teachings which seem appropriate) and explain and analyse it, so the marker can understand what you are trying to write about.

The following mark scheme is used when marking 6 mark questions:

1 MARK: An opinion supported by a simple reason/little evidence
2 MARKS: An opinion supported by two simple reasons
3 MARKS: An opinion supported by several simple reasons, or one developed reason
4 MARKS: An opinion supported by reasons backed up by the Bible, or religions ideas
5 MARKS: Two different points of view considered, with backed up ideas supported by religion
6 MARKS: Two different points of view considered, with a  well constructed response and many well developed religious ideas

English Prose (Seen Passages)

Notes:

http://mrhoyesgcsewebsite.com