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I was going to answer as to the slingshot effect, but the HSC marker's comments says: In weaker responses, candidates incorrectly applied the ëslingshot effectí to the motion of the rocket around the moon.

Explain why the gravitational potential energy of the satellite orbiting Mars is a negative value. (2 marks and only 2 lines given) Any simpler and concise answers ?

So I had this question come up in my trials. It's out of 2 marks. Jo: The Michelson-Morley Experiment was a good experiment. It was reliable and valid when it was done. Con: Well, it may have been reliable but it was not valid as it failed in its aim. Justify Jo's statement: (My...

From the Jacaranda, Time dilation and length contraction could theoretically allow exceptionally long journeys within reasonable periods of time as judged by the travellers. However, relativity also indicates that the cot of energy to do this would be prohibitive.

Any chances of a 6 marker about the history of space travel ? ie, like scientists konstantin tsiolkovsky, hermann oberth ?

Aw how come I didn't think that way..

Point T is (cos theta, sin theta) or the other way around ?

for 13/a/iii I found the perpendicular distance, then what ?

How do you even start 16b ?

Can anyone explain why 18 (How does a plant respond in order to keep cool on an extremely hot day) is B ? Nevermind, found source from Heinemann textbook, it says "Transpiration from leaves has a cooling effect on plants".

If hydrangae is grown under acidic condition, the flowers will become blue in color. However, when the soil is basic, it would produce a pink colour. I think that is for describing how genotype + environment would cause the final phenotype of an organism.

I quite have an instinct as if they would ask us to compare the sights of mammals (us human) to 2 other animals so that we need to mention the wavelenghts ? Last year was about sound, so why not sight this time. so mammal: 390-750 nm bees are good at UV light: 350-700 nm pit viper is good...

listening was good, didn't expect the interview for vision and voices :tongue: my estimate is ~80

You just need to go over the structure of few texts, ie letter to the editor, letter of complaint, interview etc. Some are obvious but yeah you cannot do much about it.

I tend not to write the same word as in the text which took my time to think about a synonym for it.

For the essay, no time to write the related text. I am expecting something good for the blog question. The unseen texts were pretty hard as well. So overall, this year was harder than the others.

I am sorting out time for each. Already done biology about 85% so 17th and 18th would be full on bio.

I am listening to the music from the london olympics 2012 opening ceremony. Kind helps with the mood

I can't find any notes about osmoconformers and osmoregulators. Can anyone give an example of how each work. Thanks

how about a 7 marker for historical developments ? The history of acids, has it came before ?