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P8 (Space (Big Bang (Red-shift (Moving away = larger wavelength = red,…
P8
Space
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Radiation
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Greenhouse
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Earth receives EM waves, including IR & UV
Satellites
Geostationary
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36,000km above Earth's surface
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Communication, satellite TV
Polar orbit
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Military, observation, weather
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Solar System
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Lifecycle
1) Hydrogen used up, fusion slows down
2) Core cools, gravity pulls layers inward
3) Core heats up, expands to red giant or supernova
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Inside
Structure
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Solid mantle core, but can flow (hot)
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Motion
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Collisions
Use F=ma for forces (force is vector, so negative)
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Internal organ injury as they move, even if your ribs aren't
Crumple zones & air bags increase time of collision, :arrow_down: acceleration
If acceleration is twice gravity, you feel force twice your weight (2g)
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Energy
National Grid
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Step-up to almost 400,000V
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Network of power stations, wires & transformers
Mains
Alternating voltage, 230V, 50Hz
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Safety
Earth wire connects case to pole in ground, prevents electrocution
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Case made of plastic so no current flows, 'double insulated', no earth
Sources
Renewable
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Expensive, CO₂ in manufacture, specific
Non-renewable
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Fossil fuels (e.g. coal, oil, gas)
Uses
Heating (fuels, solar, geothermal)
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Electricity (solar, wind, tidal, etc.)
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