Aindan
Member

Hey. I saw your posts saying you got 99.9 ATAR. Congrats! May I ask how much studying you did+ if you can give me some advice? I'm aiming for 99.9 ATAR even though the chance is quite slim.

estimate my atar please http://community.boredofstudies.org/...d.php?t=271284

ohh, we were unlucky because Mod B threw most of us off. I am expecting a 12/20 for my Mod B essay lol im so screwed

ty for the rep! not sure what it was for though haha =) i guess youre just generous~!

any. wanted to rep u back

legend.
looked for one thread u posted in,
couldnt find it.

estimation please
Subject... Trial Mark... Overall Rank (We did the CSSA Trials)
English Advanced... 65/105... 30/70
Maths Extension... 37/84... 7/15
Maths Advance... 79/120... 2/41
Physics... 72/100... 1/17
Chemistry... 59/100... 3/15
SOR 2unit... 77/100... 5/52
School Rank: 300
thanks!

"Two questions.
1. A HSC student doing her physics trial exam is sitting in her exam room on earth. Outside, she notices a spaceship travelling at 0.95c relative to her. If the astronaut on the spaceship times a certain event to take 1 hour, how long will it take from the student's point of view?
2. The same HSC student times a certain event to take 1 hour. How long will it take the astronaut on the spaceship to time the same event who is travelling 0.95 c relative to her."

1. Use of time dilation formula: T(v)= T(o)/√1-(v/c)^2 the one in bold is all inside the square root
T(v)= observer outside the frame of reference (hsc student)
T(o)= observer in the frame of rest or within the frame of reference (astronaut)

therefore T(v)= 1/√1-(0.95c/c)^2 (but your velocity is in terms of c thus the c can cancel out)
so T(v)= 1/√1-(0.95)^2
=3.20 hours

2. This time you just sub in 1 hour in T(v) and solve for T(o)

Hey,

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it's really good! and all for free cause they want to help students!