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  1. #26
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    Re: HSC Physics Marathon 2017

    Quote Originally Posted by Bluee View Post
    Just apply Keplers 3rd Law.
    That's pretty late into the Space topic so I doubt that many, if not any, people know it yet.

    But the formula is something like:

    T^2 = (4 x pi^2 x r^3)/GM

    From google.
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    Re: HSC Physics Marathon 2017

    Quote Originally Posted by pikachu975 View Post
    That's pretty late into the Space topic so I doubt that many, if not any, people know it yet.

    But the formula is something like:

    T^2 = (4 x pi^2 x r^3)/G*M

    From google.
    r^3/T^2 = G*M/4*Pi^2
    My yearlies ended weeks ago so been studying since then. So quite ahead on Space.

    Edit: Whats the point answering now that you have the formula.
    Last edited by Bluee; 26 Sep 2016 at 2:02 AM.

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    Re: HSC Physics Marathon 2017

    Quote Originally Posted by Bluee View Post
    r^3/T^2 = G*M/4*Pi^2
    My yearlies ended weeks ago so been studying since then. So quite ahead on Space.
    That's the same formula that I said. By the way what is the 'r' component?
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    Re: HSC Physics Marathon 2017

    Quote Originally Posted by pikachu975 View Post
    That's the same formula that I said. By the way what is the 'r' component?
    Orbital radius.

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    Re: HSC Physics Marathon 2017

    Quote Originally Posted by pikachu975 View Post
    That's the same formula that I said. By the way what is the 'r' component?
    I know. 'r' component is orbital radius as intergrand already pointed out. Not sure if we have to go into a lot of the theory behind calling it orbital radius.

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    Re: HSC Physics Marathon 2017

    What do I need to know from the prelim course for the HSC course?

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    Re: HSC Physics Marathon 2017

    Quote Originally Posted by dragon658 View Post
    What do I need to know from the prelim course for the HSC course?
    Prelim Physics Thread
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    Re: HSC Physics Marathon 2017

    Quote Originally Posted by dragon658 View Post
    What do I need to know from the prelim course for the HSC course?
    And about the link that eyeseeyou posted, remember that if you do the option Astrophysics, you need to know most content from the cosmic engine.
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    Re: HSC Physics Marathon 2017

    oh my bad, forgot about that. Thanks so much.

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    Re: HSC Physics Marathon 2017

    A crate of supplies for a scientific expedition to Greenland is being dropped by plane. When the supplies are dropped, the plane is travelling at 40 m/s horizontally at a height of 50 m. Sadly the parachute fails to open and the package falls to the ground at 9.8 m/s^2. Find the horizontal distance travelled by the package as it falls given that it hits the ground right at the feet of the scientific party.

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    Re: HSC Physics Marathon 2017

    Quote Originally Posted by eyeseeyou View Post
    A crate of supplies for a scientific expedition to Greenland is being dropped by plane. When the supplies are dropped, the plane is travelling at 40 m/s horizontally at a height of 50 m. Sadly the parachute fails to open and the package falls to the ground at 9.8 m/s^2. Find the horizontal distance travelled by the package as it falls given that it hits the ground right at the feet of the scientific party.
    ^BUMP

    Also Rathin do you do Quanta, Medical physics or Astro as an option?

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    Re: HSC Physics Marathon 2017

    Quote Originally Posted by eyeseeyou View Post
    A crate of supplies for a scientific expedition to Greenland is being dropped by plane. When the supplies are dropped, the plane is travelling at 40 m/s horizontally at a height of 50 m. Sadly the parachute fails to open and the package falls to the ground at 9.8 m/s^2. Find the horizontal distance travelled by the package as it falls given that it hits the ground right at the feet of the scientific party.
    127.78m

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    Re: HSC Physics Marathon 2017


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    Re: HSC Physics Marathon 2017

    Quote Originally Posted by trecex1 View Post
    127.78m
    How did you get this answer?

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    Re: HSC Physics Marathon 2017

    Quote Originally Posted by InteGrand View Post


    Quote Originally Posted by eyeseeyou View Post
    How did you get this answer?
    Quote the formulas of motion (should be obvious) set y as -50 to get t --> sub into the x-motion.

    Edit:just realised I missed a T in expanding it..oops.
    Last edited by trecex1; 27 Sep 2016 at 4:58 PM.
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    Re: HSC Physics Marathon 2017

    Quote Originally Posted by trecex1 View Post



    Quote the formulas of motion (should be obvious) set y as -50 to get t --> sub into the x-motion.
    Note that in your answer both solutions are positive, so you would need to decide (with justification!) which solution is right.

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    Re: HSC Physics Marathon 2017

    How do you guys know all this stuff? You haven't even started learning HSC content yet!
    HSC 2017 = 3U Maths | Eng Adv | Eco | Bus | Phys
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    Re: HSC Physics Marathon 2017

    Quote Originally Posted by WildestDreams View Post
    How do you guys know all this stuff? You haven't even started learning HSC content yet!
    We self learn it

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    Re: HSC Physics Marathon 2017

    Quote Originally Posted by InteGrand View Post
    Note that in your answer both solutions are positive, so you would need to decide (with justification!) which solution is right.
    Revised answer if I didn't make any more algebraic mistakes.
    Edit: The value with the + (first one) should be omitted as the value of T will be negative. I.e the sound will take longer to reach her from the bottom of the well than the time it takes for the stone to fall and the sound to reach her(?!), which is impossible.
    Last edited by trecex1; 27 Sep 2016 at 7:06 PM.

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    Re: HSC Physics Marathon 2017

    A stone is thrown vertically upwards with a velocity of 29.4 m/s from the edge of a cliff 78.4 m high. The stone falls so that it just misses the edge of the cliff and falls to the ground at the foot of the cliff. Determine the time taken by the stone to reach the ground. Assume that the acceleration due to gravity is 9.8 ms-2

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    Re: HSC Physics Marathon 2017

    Quote Originally Posted by eyeseeyou View Post
    A stone is thrown vertically upwards with a velocity of 29.4 m/s from the edge of a cliff 78.4 m high. The stone falls so that it just misses the edge of the cliff and falls to the ground at the foot of the cliff. Determine the time taken by the stone to reach the ground. Assume that the acceleration due to gravity is 9.8 ms-2
    https://postimg.org/image/d0zyhtyp9/
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    Re: HSC Physics Marathon 2017

    Discuss the g-forces astronauts experience during the launch of a multi stage rocket and assess measures taken to minimize them. (7 marks)

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    Re: HSC Physics Marathon 2017

    Quote Originally Posted by jathu123 View Post
    Jathu u nerd
    it's Uy NOT Uu
    Last edited by Commando007; 20 Oct 2016 at 12:36 PM.

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    Re: HSC Physics Marathon 2017

    Quote Originally Posted by pikachu975 View Post
    And about the link that eyeseeyou posted, remember that if you do the option Astrophysics, you need to know most content from the cosmic engine.
    Actualyyyy, I didn't bother remembering anything from Prelim and I'm doing great in Astro.
    I guess it's iseful to remember some concepts like H-R Diagram and stars. But majority of it is new content. That's just my 2 cents.


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    Re: HSC Physics Marathon 2017

    Determine the gravitational force between a 77.5 kg astronaut and Earth when he is standing on the ground. Calculate the change in gravitational force when the astronaut is inside a satellite orbiting the Earth at an altitude of 685 km. The radius of the Earth is 6380 km and the mass of the earth is 5.97*10^24 kg. [4 marks]

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