February 27, 2020, 04:08:14 pm

### AuthorTopic: HSC Physics Marathon[NEW SYLLABUS]  (Read 3425 times) Tweet Share

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#### DrDusk

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##### HSC Physics Marathon[NEW SYLLABUS]
« on: September 06, 2019, 01:11:28 am »
+9
Hi there this is probably the first thread I've ever created so I'm quite inexperienced at this, but here goes

I've noticed with the new syllabus being rolled out that students have been expressing how questions are tough, especially because they have no resources to study the harder calculation/mathematical type questions. This is why I've created this thread.

I aim in this thread to create a collection of HSC level calculation questions for the new syllabus, especially as there is a LOT more emphasis on the Mathematical aspect of it. I will post questions on here regularly so hopefully at least someone finds them useful. All these questions will be of HSC level, so anyone doing HSC should find them as good practice.

I wish all the best for student's who are and will be taking Physics in high school, and also hope that this thread provides some good questions for you to train your mind with.

Note: I will not be focusing on the essay questions.

You will also need an account to see the questions...
« Last Edit: October 13, 2019, 04:25:59 pm by DrDusk »
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#### DrDusk

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##### Re: Weekly HSC Physics Marathon
« Reply #1 on: September 06, 2019, 01:12:16 am »
+3
Question 1:

This one is quite easy. Make sure to set your working and equations out clearly.
« Last Edit: September 06, 2019, 01:38:17 am by DrDusk »
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#### Coolmate

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##### Re: Weekly HSC Physics Marathon[NEW SYLLABUS]
« Reply #2 on: September 06, 2019, 07:48:20 am »
0
Hi DrDusk, this is a great thread well done! I'm excited to start answering questions!

For the first question is this projectile motion?

Coolmate
« Last Edit: September 06, 2019, 08:16:05 am by Coolmate »
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#### DrDusk

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##### Re: Weekly HSC Physics Marathon[NEW SYLLABUS]
« Reply #3 on: September 06, 2019, 02:07:33 pm »
0
Hi DrDusk, this is a great thread well done! I'm excited to start answering questions!

For the first question is this projectile motion?

Coolmate

Very much projectile motion!

A question using using a similar 'type' of approach has been asked in the HSC before, so if you can do this, you can do any question they can ask.
« Last Edit: September 06, 2019, 02:09:32 pm by DrDusk »
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#### Coolmate

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##### Re: Weekly HSC Physics Marathon[NEW SYLLABUS]
« Reply #4 on: September 06, 2019, 03:12:25 pm »
0
Would you use tan() and sub it in as: 100/100tan(45)?

=1m
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#### DrDusk

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##### Re: Weekly HSC Physics Marathon[NEW SYLLABUS]
« Reply #5 on: September 06, 2019, 03:39:41 pm »
0
Would you use tan() and sub it in as: 100/100tan(45)?

=1m
Sorry, could you please elaborate? I don't understand what you mean
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#### fun_jirachi

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##### Re: Weekly HSC Physics Marathon[NEW SYLLABUS]
« Reply #6 on: September 06, 2019, 05:04:22 pm »
+1
My solution in the spoiler: (which is hopefully correct )
Spoiler
$\text{Given that initial horizontal velocity is} \ 100ms^{-1} \ \text{and initial vertical velocity is zero} \\ \text{We have that} \ s_x=100t \ \text{and} \ s_y=100-4.9t^2 \\ \text{Subbing in,} \ s_y=100-4.9\left(\frac{s_x}{100}\right)^2 \\ \text{When the projectile hits the hill} \ s_x = s_y \ \text{since the hill is inclined at 45 degrees} \\ \text{ie.} \ s_x=100-4.9\left(\frac{s_x}{100}\right)^2 \\ \text{For simplicity, let} \ s_x=x \ \text{ie. the horizontal distance travelled when the ball hits the hill will be} \ x \\ x=100-4.9\left(\frac{x}{100}\right)^2 \\ \frac{4.9}{10000}x^2+x-100=0 \\ x=\frac{-1+\sqrt{1+400 \times \frac{4.9}{10000}}}{\frac{2\times 4.9}{10000}} \\ \text{(Rejecting the negative solution, since we are looking for distance travelled)} \\ x=95.52841751... \\ \text{ie.} \ s_y = 95.52841751 \\ \text{Hence, the ball has dropped} \ 4.5 \text{m when it strikes the hill, to two significant figures.}$
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#### DrDusk

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##### Re: Weekly HSC Physics Marathon[NEW SYLLABUS]
« Reply #7 on: September 06, 2019, 06:17:08 pm »
+1
My solution in the spoiler: (which is hopefully correct )
Spoiler
$\text{Given that initial horizontal velocity is} \ 100ms^{-1} \ \text{and initial vertical velocity is zero} \\ \text{We have that} \ s_x=100t \ \text{and} \ s_y=100-4.9t^2 \\ \text{Subbing in,} \ s_y=100-4.9\left(\frac{s_x}{100}\right)^2 \\ \text{When the projectile hits the hill} \ s_x = s_y \ \text{since the hill is inclined at 45 degrees} \\ \text{ie.} \ s_x=100-4.9\left(\frac{s_x}{100}\right)^2 \\ \text{For simplicity, let} \ s_x=x \ \text{ie. the horizontal distance travelled when the ball hits the hill will be} \ x \\ x=100-4.9\left(\frac{x}{100}\right)^2 \\ \frac{4.9}{10000}x^2+x-100=0 \\ x=\frac{-1+\sqrt{1+400 \times \frac{4.9}{10000}}}{\frac{2\times 4.9}{10000}} \\ \text{(Rejecting the negative solution, since we are looking for distance travelled)} \\ x=95.52841751... \\ \text{ie.} \ s_y = 95.52841751 \\ \text{Hence, the ball has dropped} \ 4.5 \text{m when it strikes the hill, to two significant figures.}$

Well done! Looks like your all set for Projectile Motion
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#### DrDusk

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##### Re: Weekly HSC Physics Marathon[NEW SYLLABUS]
« Reply #8 on: September 06, 2019, 09:15:55 pm »
+1
Question 2: This will be the final question for this week.

This is a multi-part step by step question that requires you to picture the scenario and deduce what is happening. This is a common exam type question that they love asking. If you look in the sample paper provided by NESA, you can see that they like to ask questions like this where you need to use a graph.

This is not a very easy question, you will need to think. Luckily though you would only get one of these types in the actual paper.

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#### DrDusk

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##### Re: Weekly HSC Physics Marathon[NEW SYLLABUS]
« Reply #9 on: September 11, 2019, 09:40:50 am »
+1
Question 2 still stands! This question appeared in my schools trial and ironically I was the only one who got full marks

Has anyone attempted it? If your stuck I can give hints before I post the solution.

Solution will be posted today
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#### DrDusk

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##### Re: Weekly HSC Physics Marathon[NEW SYLLABUS]
« Reply #10 on: September 11, 2019, 12:54:33 pm »
+2

If you haven't tried the question don't open this first.
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#### DrDusk

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##### Re: Weekly HSC Physics Marathon[NEW SYLLABUS]
« Reply #11 on: September 14, 2019, 09:38:09 pm »
+4
Question 3:

This is a good question. You will need to think!

A very good question for the new syllabus!

Let me add just in case, you may make the assumption that the effect of gravity on the electron is negligible

Also typo. The time spent between the plates should be 2.6 times 10^{-9} in the 2nd last line!
« Last Edit: September 14, 2019, 10:28:14 pm by DrDusk »
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#### Coolmate

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##### Re: Weekly HSC Physics Marathon[NEW SYLLABUS]
« Reply #12 on: October 03, 2019, 08:51:16 pm »
0
Hey DrDusk!

Would you happen to have any practice questions I could attempt on Projectile Motion, Circular Motion, and Keplers Laws? I am trying to teach myself before the term starts

Coolmate
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#### DrDusk

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##### Re: Weekly HSC Physics Marathon[NEW SYLLABUS]
« Reply #13 on: October 03, 2019, 09:01:04 pm »
0
Hey DrDusk!

Would you happen to have any practice questions I could attempt on Projectile Motion, Circular Motion, and Keplers Laws? I am trying to teach myself before the term starts

Coolmate
Sure thing. I'll come up with some =)

I was actually waiting for this so I know what kind of questions people are looking for

fyi my last question with the electron is a projectile motion one as well
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#### Coolmate

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##### Re: Weekly HSC Physics Marathon[NEW SYLLABUS]
« Reply #14 on: October 03, 2019, 09:07:43 pm »
0
Sure thing. I'll come up with some =)

I was actually waiting for this so I know what kind of questions people are looking for

fyi my last question with the electron is a projectile motion one as well

Awesome! Thanks DrDusk, I really appreciate this

Cheers,

Coolmate

btw: I may not be correct in some questions as I am still learning
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