Paradoxica
-insert title here-
personally, 16 (a) is the harder question for me, because i understand irrationality proofs like physicists understand newtonian mechanics
-
Finished your HSC? Check out our University Discussion, Non-School forums or help out next year's HSC students! -
YOU can help the next generation of students in the community! Share your trial papers and notes on our Notes & Resources page
BoS trials Maths and Chemistry 2020 (1 Viewer)
- Thread starter Trebla
- Start date
Imagine having to prove irrationality when you can just plug it into a calculator. QED.
- Joined
- Feb 16, 2005
- Messages
- 8,391
- Gender
- Male
- HSC
- 2006
I reckon Q16a) is probably as challenging as you can get when it comes to resisted projectile motion, mainly because a sneaky trick is needed to get part (ii) out, otherwise you're going to be stuck. Most textbook or past exam questions (of which there are very few) are far more straightforward.
Paradoxica
-insert title here-
numbers have an end
therefore all decimal expansions terminate
therefore all real numbers are rational
this is satire btw
is there even gonna be a nesa party with covid
check their solutions
- Joined
- Feb 16, 2005
- Messages
- 8,391
- Gender
- Male
- HSC
- 2006
The direction in which you resolve the forces is not horizontal/vertical. It is parallel/perpendicular to the inclined surface. This is because the net force of the object is parallel to the inclined surface.
Ohh I get it now, thank you
- Joined
- Feb 16, 2005
- Messages
- 8,391
- Gender
- Male
- HSC
- 2006
Not yet. Maths is taking priority at this stage as their exams are sooner. Chemistry should be out around a week after.
- Joined
- Feb 16, 2005
- Messages
- 8,391
- Gender
- Male
- HSC
- 2006
Just marked Q12 of Maths Ext1 and have some feedback on Q12e)i)
The question asked students to prove a given vector relationship between A, B and P given that
A very common response from students was to assert that
\overrightarrow{BP})
This is not correct because the given ratio above is purely related to vector magnitudes. To convert to vector equations, you need to take into consideration both the magnitude AND the direction of the vectors. Notice that vector AP does NOT point into the same direction as BP (as P lies in the interval AB) so they cannot be related by a positive scalar. Many students attempted to fudge the result when they realised the algebra did not work out from this assertion. Better responses carefully considered the directions that the vectors were pointing and often related the directions of AP and AB.
The question asked students to prove a given vector relationship between A, B and P given that
A very common response from students was to assert that
This is not correct because the given ratio above is purely related to vector magnitudes. To convert to vector equations, you need to take into consideration both the magnitude AND the direction of the vectors. Notice that vector AP does NOT point into the same direction as BP (as P lies in the interval AB) so they cannot be related by a positive scalar. Many students attempted to fudge the result when they realised the algebra did not work out from this assertion. Better responses carefully considered the directions that the vectors were pointing and often related the directions of AP and AB.
ok thanks
- Joined
- Feb 16, 2005
- Messages
- 8,391
- Gender
- Male
- HSC
- 2006
Aiming for tomorrow. In the meantime, feel free to ask any specific questions here if you want some answers.