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  1. K

    Question about acceleration for rocket launch and return

    So when a rocket is launched; a=T-mg/m You sub in g=+9.8ms^-2 However, when the rocket is returning to earth, do you still use +9.8ms^-2 or -9.8ms^-2? Thanks.
  2. K

    2012 MC HSC Exam question help

  3. K

    Force need to get spacecraft into orbit

    What is the force (N) required to get a space craft of mass 1000kg into orbit at 3000km above the earth's surface? Assume the radius of the earth is 6370km.
  4. K

    Help with orbital question

    To place a satellite of mass 10 000 kg in orbit around the Earth, 5.73 x 10^11 J of work is done. Calculate how far from the Eath's surface the satellite is placed in its oribtal path
  5. K

    Harder physics questions per topic

    Does anyone have some harder physics questions on: Gravity and potential energy Escape velocity Projectile motion Kepler's law of periods Law of conservation of momentum
  7. K

    Does percentage error relate to the reliability or accuracy of results?

    ^
  8. K

    Why is HCl added to the fertiliser when finding the % of sulphate in lawn fertiliser?

    In terms of the chemistry involved?
  9. K

    Drop Business or Eco HSC?

    So I will be picking up EXT 2 maths for the HSC and need to drop a subject so that I don't have 14 Units. Ranks: Business Studies - #1 or #2 (haven't got yearlies back yet) Economics - #1 or #2 (haven't got yearlies back yet) I am aware that economics scales better. However, I feel like...
  10. K

    2018 HSC | Should I drop Economics or Business Studies?

    So I will be picking up EXT 2 maths for the HSC and need to drop a subject so that I don't have 14 Units. Ranks: Business Studies - #1 or #2 (haven't got yearlies back yet) Economics - #1 or #2 (haven't got yearlies back yet) I am aware that economics scales better. However, I feel like my...
  11. K

    Should I do 4U maths?

    Do you think I should do 4U maths. My Ext 1 marks are as follows: Test 1: 93% Test 2 (Half yearly): 85% Test 3: 80% Test 4 (yearly): 93.5% Overall: 88% Rank #2 So what do you think, and what are some important things to consider in the decision. Thanks :tongue:
  13. K

    String tension question

    I need help answering this question.
  14. K

    Physics questions about batteries.

    Sketch a battery that would create electricity according to the scientific discoveries of each of Galvani, Volta and Davy. (3 sketches in all) Any ideas? One way to deliver energy to Australian outback locations is to simply run power lines out to them and connect them to the main grid...
  15. K

    Is Iron (Fe) soluble in water.

    I'm talking about the elemental iron not an ion etc.
  16. K

    What are some everyday uses of superposition of waves?

    As the title stated. So far I have noise canceling headphones. Answers will be greatly apreciated.
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