(Original post by Sulfur)
These are what I put, can anyone give an approximate mark (or correct them!
)
P4 6 maker:
At the start all of the forces are stationary (weight and gravity are constants)
When he runs, he begins to accelerate and build up momentum
Air resistance is not a greater force after a bit, his resultant force is to go forward (driving force) from the build up of forces
When continuing to run, he builds up more acceleration and momentum (work done)
This results in a greater K.E and when he jumps he transfers the energy to go higher/further
KE = work done, KE turns to GPE and then he begins to fall
P5:
Filament lamp wire is smaller so there are more collisions with the free moving ions
This results in a greater resistance and the temperature rises
This causes the filament lamp to glow
Connecting wires are bigger so there are less collisions with the free moving ions
This results in less resistance and the temperature isn't as great
This means that the wires don't glow
I think I put something else too (anyone got an idea?
), but my answer filled the last line only.
P6:
I agree that there are risks as radioactive waste emits ionising radiation
Ionising radiation can kill/damage cells and cause mutations and cancer if people are close to the power station
However, power stations are built away from most people and disposed of correctly
Low level waste - (e.g medical gloves?
) - disposed on dumps/landfill sites - has a long half life, low activity - but public could still be affected
Intermediate level waste (e.g surgical equipment?
) - disposed of by putting it in cement and steel contains - shorter half life, more activity - away from public as it's underground
High level waste (forgot to put an example...) - short half life, high activity - put in glass (vitrification), cooled to reduce heat and put underground in containers - away from people
Overall, there are risks but the benefits (no CO2, more energy) outweighs the risks of radioactive waste.
)
), but my answer filled the last line only.
) - disposed on dumps/landfill sites - has a long half life, low activity - but public could still be affected
Go to first unread
