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March 29, 2024, 02:52:36 am

Author Topic: HSC Physics Question Thread  (Read 1030454 times)  Share 

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Coolmate

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Re: HSC Physics Question Thread
« Reply #3870 on: January 16, 2020, 09:42:12 am »
0
Hey!

The first thing you should note is that if we rotate this wire such that it is vertical, nothing here changed, the magnetic field still passes directly through the wire, meaning on this axis, the angle in which it is held does not matter, so the value for sine is 90. (because the angle that the rod and the magnetic field makes will always be 90, no matter which way we orientate our wire on this axis we spoke about earlier)

Hope this helps!

Hi blasonduo, just wondering, is it 90 degrees for the value of theta for every question of this type?
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blasonduo

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Re: HSC Physics Question Thread
« Reply #3871 on: January 16, 2020, 12:19:57 pm »
+4
Hi blasonduo, just wondering, is it 90 degrees for the value of theta for every question of this type?

Hey! Not necessarily. For example, if the magnetic field was pointing up, the axis of rotation would matter. When I went through these type of questions, they tended to ask a mixture of both questions where it either did or didn't matter. This is why it is extremely important to do the "rotation test". You are always looking for the angle between the current and magnetic field. If both of these are pointing up, the angle is 0, and so it would be sin(0) = 0.

Hope this helps! Keep asking away if it doesn't. :)
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Re: HSC Physics Question Thread
« Reply #3872 on: January 16, 2020, 03:39:44 pm »
+2
Hi, In this questions is I am confused about the angle that theta should be.
Hey! Not necessarily. For example, if the magnetic field was pointing up, the axis of rotation would matter. When I went through these type of questions, they tended to ask a mixture of both questions where it either did or didn't matter. This is why it is extremely important to do the "rotation test". You are always looking for the angle between the current and magnetic field. If both of these are pointing up, the angle is 0, and so it would be sin(0) = 0.

Hope this helps! Keep asking away if it doesn't. :)
Just to add onto this. In an exam if you ever feel confused as to what the angle should be get your pen and make it the magnetic field and make your ruler the wire. Arrange it as it shows in the diagram and observe the angle that you need.

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Re: HSC Physics Question Thread
« Reply #3873 on: January 16, 2020, 03:53:39 pm »
+1
Hey! Not necessarily. For example, if the magnetic field was pointing up, the axis of rotation would matter. When I went through these type of questions, they tended to ask a mixture of both questions where it either did or didn't matter. This is why it is extremely important to do the "rotation test". You are always looking for the angle between the current and magnetic field. If both of these are pointing up, the angle is 0, and so it would be sin(0) = 0.

Hope this helps! Keep asking away if it doesn't. :)

Just to add onto this. In an exam if you ever feel confused as to what the angle should be get your pen and make it the magnetic field and make your ruler the wire. Arrange it as it shows in the diagram and observe the angle that you need.

Thanks blasonduo and DrDusk 8)
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Re: HSC Physics Question Thread
« Reply #3874 on: January 17, 2020, 06:45:03 pm »
0
Hi everyone, ;D

I am having trouble with trying to calculate the orbital velocity of a satellite in a Low Earth Orbit. I know I need to use the formula:

$$v=\sqrt{\frac{GM}{r}}$$

But, I know I need to use the constants 'G' and 'M', but am unsure about the value of 'r'.
Could someone please point me in the right direction? :)

Thanks in advance,
Coolmate 8)
« Last Edit: January 17, 2020, 07:27:56 pm by Coolmate »
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Erutepa

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Re: HSC Physics Question Thread
« Reply #3875 on: January 17, 2020, 08:52:28 pm »
+2
Hi everyone, ;D

I am having trouble with trying to calculate the orbital velocity of a satellite in a Low Earth Orbit. I know I need to use the formula:

$$v=\sqrt{\frac{GM}{r}}$$

But, I know I need to use the constants 'G' and 'M', but am unsure about the value of 'r'.
Could someone please point me in the right direction? :)

Thanks in advance,
Coolmate 8)
here 'r' is the distance between the center of mass of the orbiting body and the body it is orbiting around.
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Coolmate

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Re: HSC Physics Question Thread
« Reply #3876 on: January 18, 2020, 04:22:14 pm »
+1
here 'r' is the distance between the center of mass of the orbiting body and the body it is orbiting around.

Hey Erutepa, thankyou for the help! ;D I have figured out the radius to be: Radius of Earth + Low Earth Orbit = the desired value

Thanks again!
Coolmate 8)
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shekhar.patel

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Re: HSC Physics Question Thread
« Reply #3877 on: January 20, 2020, 08:23:18 pm »
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Hey, does ATAR notes have videos on some of the key concepts covered in year 12 like they do for Math. Please let me know. Thanks

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Re: HSC Physics Question Thread
« Reply #3878 on: January 20, 2020, 08:38:54 pm »
+2
Hey shekhar.patel! ;D

If you follow this link, there are some videos on some concepts. I think these are for the new syllabus? (Could someone please verify):

https://www.youtube.com/channel/UCZRlS4Zld_pZ_O1J_ctZfqA/search?query=physics

Also:
Jamon has divided his video series into ten main areas:
- Video 1: Studying for Physics
- Video 2: Long Response Questions
- Video 3: Mathematical Questions
- Video 4: Orbits
- Video 5: Motors
- Video 6: Transformers
- Video 7: Models of Light
- Video 8: The Atom
- Video 9: Exam Preparation
- Video 10: Exam Technique

I hope this helps!
Coolmate 8)
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shekhar.patel

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Re: HSC Physics Question Thread
« Reply #3879 on: January 20, 2020, 08:44:23 pm »
+1
Hey shekhar.patel! ;D

If you follow this link, there are some videos on some concepts. I think these are for the new syllabus? (Could someone please verify):

https://www.youtube.com/channel/UCZRlS4Zld_pZ_O1J_ctZfqA/search?query=physics

Also:
Jamon has divided his video series into ten main areas:
- Video 1: Studying for Physics
- Video 2: Long Response Questions
- Video 3: Mathematical Questions
- Video 4: Orbits
- Video 5: Motors
- Video 6: Transformers
- Video 7: Models of Light
- Video 8: The Atom
- Video 9: Exam Preparation
- Video 10: Exam Technique

I hope this helps!
Coolmate 8)

Hi , Coolmate, thanks for the help, much appreciated

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Re: HSC Physics Question Thread
« Reply #3880 on: January 20, 2020, 09:08:31 pm »
+1
Hey shekhar.patel! ;D

If you follow this link, there are some videos on some concepts. I think these are for the new syllabus? (Could someone please verify):

https://www.youtube.com/channel/UCZRlS4Zld_pZ_O1J_ctZfqA/search?query=physics

Also:
Jamon has divided his video series into ten main areas:
- Video 1: Studying for Physics
- Video 2: Long Response Questions
- Video 3: Mathematical Questions
- Video 4: Orbits
- Video 5: Motors
- Video 6: Transformers
- Video 7: Models of Light
- Video 8: The Atom
- Video 9: Exam Preparation
- Video 10: Exam Technique

I hope this helps!
Coolmate 8)
Can confirm that they are updated for the new syllabus ;D
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Re: HSC Physics Question Thread
« Reply #3881 on: January 20, 2020, 09:47:00 pm »
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Can confirm that they are updated for the new syllabus ;D

Awesome, thanks r1ckworthy :D
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Re: HSC Physics Question Thread
« Reply #3882 on: January 24, 2020, 03:28:07 pm »
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Hi Everyone, ;D

I have a question about the Van Allen Belts. Is a Low Earth Orbit within the Inner Van Allen Belt and if so how would the radiation affect the satellites within a Low Earth Orbit?💫

Thanks in advance,
Coolmate 8)
« Last Edit: January 24, 2020, 03:30:09 pm by Coolmate »
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Re: HSC Physics Question Thread
« Reply #3883 on: February 06, 2020, 10:33:32 pm »
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Hi!
Unsure about how to do this question- could someone please help?



Thanks so much!

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Re: HSC Physics Question Thread
« Reply #3884 on: February 09, 2020, 12:53:22 am »
+8
Hi Everyone, ;D

I have a question about the Van Allen Belts. Is a Low Earth Orbit within the Inner Van Allen Belt and if so how would the radiation affect the satellites within a Low Earth Orbit?💫

Thanks in advance,
Coolmate 8)

Hey! Sorry that this answer is a little late, but the inner Van Allen belt appears to be at a 1000km altitude or above in most areas, which would traditionally be considered higher than a LEO. Wikipedia (lol) tells me that some places it can have concentrations at lower altitudes though so in some places maybe? This is outside syllabus scope though :)

Hi!
Unsure about how to do this question- could someone please help?

(Image removed from quote.)

Thanks so much!

Your working is on the right track! We get the EMF by relating it to the change in flux, which you have spotted. Note the initial flux is zero (no magnetic field). So the change in flux is basically just whatever flux is from the current, divided by the time taken to switch that on (0.1s). The one missing piece for you I think is the formula which gives you a magnetic flux produced by a current in a solenoid. First, remember the difference between flux and flux density, \(\phi=BA\). That in mind, the formula you need is a Prelim formula:



So in summary the steps are:

- Figure out the strength of the magnetic field produced by the larger solenoid using the formula above (reference your Prelim notes!)
- Figure out how much flux this introduces in the smaller solenoid using \(\phi=BA\). Remember the \(A\) should be the area for the smaller solenoid because that is where the current is induced!
- Use this flux (also the change in flux, remember the initial flux is zero!) in \(\epsilon=\frac{\Delta \phi}{\Delta t}\) to determine the resultant induced emf.

Hopefully this is enough to let you have a go - It's a tough question (B6 level) so awesome job for wanting to explore it and understand it properly :)