Podcast
Questions and Answers
What charge does the ball acquire after coming into contact with the positively charged sphere?
What charge does the ball acquire after coming into contact with the positively charged sphere?
- Negatively charged
- Positively charged (correct)
- No charge
- Neutral charge
What happens to the interaction between the ball and the sphere after the ball becomes positively charged?
What happens to the interaction between the ball and the sphere after the ball becomes positively charged?
- They attract each other
- They form a new charge
- They remain neutral
- They repel each other (correct)
What occurs when the Perspex rod is rubbed with wool?
What occurs when the Perspex rod is rubbed with wool?
- Electrons move from the rod to the cloth (correct)
- Electrons move from the cloth to the rod
- Both become positively charged
- They remain neutral
When the Perspex rod is brought near a stream of water, what part of the water molecules gets attracted to the rod?
When the Perspex rod is brought near a stream of water, what part of the water molecules gets attracted to the rod?
Why does the stream of water bend towards the Perspex rod when it is brought close?
Why does the stream of water bend towards the Perspex rod when it is brought close?
What type of charge does the Perspex rod have after being rubbed with wool?
What type of charge does the Perspex rod have after being rubbed with wool?
What can be said about the charges of the Perspex rod and the wool after they have been rubbed together?
What can be said about the charges of the Perspex rod and the wool after they have been rubbed together?
What is the effect of the Perspex rod's charge when it is held stationary?
What is the effect of the Perspex rod's charge when it is held stationary?
What is the primary function of greenhouse gases in the Earth's atmosphere?
What is the primary function of greenhouse gases in the Earth's atmosphere?
What would Earth's average temperature be without the greenhouse effect?
What would Earth's average temperature be without the greenhouse effect?
Which human activities are contributing to the Enhanced Greenhouse Effect?
Which human activities are contributing to the Enhanced Greenhouse Effect?
As greenhouse gas levels increase, what effect does it have on outgoing and reflected solar radiation?
As greenhouse gas levels increase, what effect does it have on outgoing and reflected solar radiation?
What is the trend in the concentration of greenhouse gases since the last Ice Age?
What is the trend in the concentration of greenhouse gases since the last Ice Age?
What happens to the overall surface temperature as greenhouse gas levels rise?
What happens to the overall surface temperature as greenhouse gas levels rise?
In a greenhouse gas simulation, what is the impact of GHG on incoming solar radiation?
In a greenhouse gas simulation, what is the impact of GHG on incoming solar radiation?
What effect does the Enhanced Greenhouse Effect have on the Earth's energy balance?
What effect does the Enhanced Greenhouse Effect have on the Earth's energy balance?
What does voltage represent in an electrical circuit?
What does voltage represent in an electrical circuit?
What unit is used to measure electrical resistance?
What unit is used to measure electrical resistance?
Which of the following materials is classified as a conductor?
Which of the following materials is classified as a conductor?
Which formula accurately describes the relationship between resistance, length, and cross-sectional area?
Which formula accurately describes the relationship between resistance, length, and cross-sectional area?
As the length of nichrome wire increases, what happens to its resistance?
As the length of nichrome wire increases, what happens to its resistance?
What does the symbol ρ (rho) represent in the resistance formula?
What does the symbol ρ (rho) represent in the resistance formula?
What happens to current in a circuit if resistance increases and voltage remains constant?
What happens to current in a circuit if resistance increases and voltage remains constant?
Which of the following statements about insulators is correct?
Which of the following statements about insulators is correct?
Which of the following is a problem associated with exploiting rock oil?
Which of the following is a problem associated with exploiting rock oil?
Which of these is NOT an effect of ancient global warming 55 million years ago?
Which of these is NOT an effect of ancient global warming 55 million years ago?
What role does weathering play in the cooling of the climate after the formation of the Himalayas?
What role does weathering play in the cooling of the climate after the formation of the Himalayas?
What is one of the trials humans are undertaking to remove excess carbon from the atmosphere?
What is one of the trials humans are undertaking to remove excess carbon from the atmosphere?
What is the primary purpose of the storage facility at Svalbard?
What is the primary purpose of the storage facility at Svalbard?
What describes the carbon cycle?
What describes the carbon cycle?
In the carbon cycle, what happens during photosynthesis?
In the carbon cycle, what happens during photosynthesis?
What is the correct equation for photosynthesis?
What is the correct equation for photosynthesis?
What occurs when opposite poles of two magnets are brought together?
What occurs when opposite poles of two magnets are brought together?
What happens to a bar magnet when it is broken in half?
What happens to a bar magnet when it is broken in half?
Which characteristic describes the Earth's magnetic field?
Which characteristic describes the Earth's magnetic field?
When current flows through a conductor, what type of magnetic field is generated?
When current flows through a conductor, what type of magnetic field is generated?
If like poles of two magnets are brought together, what will occur?
If like poles of two magnets are brought together, what will occur?
In what direction would a compass point when placed near a North pole of a magnet?
In what direction would a compass point when placed near a North pole of a magnet?
What is impossible to create in magnetism according to the properties of magnets?
What is impossible to create in magnetism according to the properties of magnets?
How does a compass respond when positioned within the Earth's magnetic field?
How does a compass respond when positioned within the Earth's magnetic field?
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Study Notes
Greenhouse Gases
- Greenhouse gases in the Earth’s atmosphere keep the Earth’s temperature from becoming too cold
- Greenhouse Gases (GHG) absorb and re-emit some IR radiation back to the Earth’s surface, keeping us warm
- Without this effect, Earth’s temperature would be about -18 oC rather than 15 oC
Enhanced Greenhouse Effect
- Increased levels of greenhouse gases in the atmosphere have caused an Enhanced Greenhouse Effect
- Human activities such as burning fossil fuels, agriculture and land clearing are increasing the amount of greenhouse gases released into the atmosphere.
- This is trapping extra heat, and causing the Earth's temperature to rise
Effects of Increased Greenhouse Gases
- As the amount of GHG increases, there is NO effect on INCOMING solar radiation (yellow)
- As the amount of GHG increases, the intensity of the emitted radiation increases, a greater proportion is reflected by GHG back to the surface, total outgoing radiation remains constant
- As the amount of GHG increases, surface temperature increases
Carbon Cycle
- The carbon cycle describes how carbon moves between the atmosphere, soils, living creatures, the ocean, and human sources.
- Carbon is released into the atmosphere through auto and factory emissions (burning fossil fuels), plant and animal respiration, and decay organisms
- Carbon is captured from the atmosphere through photosynthesis and ocean uptake
Photosynthesis
- Word equation: Carbon dioxide + water → oxygen and glucose
- Chemical equation: 6𝐶𝑂2 + 6𝐻2𝑂→6𝑂2 + 𝐶6𝐻12𝑂6
Animal and Plant Respiration
- Word equation: Glucose + oxygen → Carbon dioxide + water
- Chemical equation: 𝐶6𝐻12𝑂6 + 6𝑂2 → 6𝐶𝑂2 + 6𝐻2𝑂
Impacts of the Enhanced Greenhouse Effect in Australia
- Increased overall temperatures
- Ocean warming and sea level rise
- Extreme weather events
- Altered rainfall patterns
Properties of Magnets
- When opposite poles of two magnets are brought together, the two magnets will be attracted
- When like poles of two magnets are brought together, the two magnets will be repelled
- If a bar magnet is broken in half, a North and a South pole will form on each magnet
- It is not possible to create a monopole magnet (a magnet with only one pole).
- Magnets will always form a dipole.
Earth’s Magnetic Field
- The Earth has a dipolar magnetic field which acts like a huge bar magnet.
- A compass magnet is free to align itself with the Earth’s magnetic field.
- Compasses will “point” to the magnetic north pole, which is slightly offset from the geographic north pole.
- The rules of field lines effectively means that there is an inverted bar magnet inside the Earth.
Electromagnetism
- When current is passed through a conductor, a temporary, circular shaped magnetic field is created
- A compass will follow the field lines in the same way.
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