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HSC Physics Marathon 2013-2015 Archive (1 Viewer)
- Thread starter Magical Kebab
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Fizzy_Cyst
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re: HSC Physics Marathon Archive
^^ so many students get these types of questions incorrect!!
^^ so many students get these types of questions incorrect!!
re: HSC Physics Marathon Archive
since they all orbit the same central body (the sun) GM/4(pi)^2 is constant
So you can equate r1^3/t1^2=r2^3/t2^2
kepler's 3rd law
how to do dis??
since they all orbit the same central body (the sun) GM/4(pi)^2 is constant
So you can equate r1^3/t1^2=r2^3/t2^2
Menomaths
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re: HSC Physics Marathon Archive
Can you also explain the question above above if you're not busy?
Ahhh thanks Parbee!
Can you also explain the question above above if you're not busy?
re: HSC Physics Marathon Archive
You need to work out the length of the wire in the field, getting l=0.3/sin(30)=3/5
therefore F=5x10^-4 x 3 x 3/5 x sin(30)= 4.5x10^-4 N
( I think dis is right, its been so long lel)
F=nBILsin(theta)
You need to work out the length of the wire in the field, getting l=0.3/sin(30)=3/5
therefore F=5x10^-4 x 3 x 3/5 x sin(30)= 4.5x10^-4 N
( I think dis is right, its been so long lel)
re: HSC Physics Marathon Archive
v=sqrt(GM/r)= sqrt[(6.67x10^-11 x 1.9x10^27)/(7.78x10^11 + 7.15x10^7)]=403.6ms^-1 x (10^-3)/(1/3600)= 1453 kmh^-1
maybe im derping but uhm all the answers seem wrong, if you work backwards you find that they all give a radius thats x10^15 :/
v=sqrt(GM/r)= sqrt[(6.67x10^-11 x 1.9x10^27)/(7.78x10^11 + 7.15x10^7)]=403.6ms^-1 x (10^-3)/(1/3600)= 1453 kmh^-1
Use (delta)x= Ux x t where (delta)x is your range and t is your time of flight
too much maffs halp me get through!
Menomaths
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re: HSC Physics Marathon Archive
Wow these questions have a lot of wrong answers then. I did use Ux.t=delta x but none of the answers are correct.
For the first one I also got 403 and for the second one I'm getting 33.25
Good to know I'm not that incompetent(though it wasted a lot of my time)
Wow these questions have a lot of wrong answers then. I did use Ux.t=delta x but none of the answers are correct.
For the first one I also got 403 and for the second one I'm getting 33.25
Good to know I'm not that incompetent(though it wasted a lot of my time)
re: HSC Physics Marathon Archive
I think they're meant to be in km/s ?--> I'm getting 13.1 km/s
re: HSC Physics Marathon Archive
and for 33.25 i guess you would choose the closest which is 33.4
403 is in ms^-1, don't forget to convert to kmh^-1Wow these questions have a lot of wrong answers then. I did use Ux.t=delta x but none of the answers are correct.
For the first one I also got 403 and for the second one I'm getting 33.25
Good to know I'm not that incompetent(though it wasted a lot of my time)
and for 33.25 i guess you would choose the closest which is 33.4
re: HSC Physics Marathon Archive
Oh I thought we're assuming an object is orbiting jupiter at the given distance
re: HSC Physics Marathon Archive
If it is orbiting the sun then this is correct (even though they didn't give the mass of the sun :L)
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