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Calculating the diameter of Venus........

mass of sun = 2*10^30kg
radius of sun =7.0*10^8m
radius of orbit of venus = 1.08*10^11m
radius of orbit of earth=1.50*10^11m

with this info

and what is angular size definition pls
(edited 8 years ago)
Original post by Mihael_Keehl
mass of sun = 2*10^30kg
radius of sun =7.0*10^8m
radius of orbit of venus = 1.08*10^11m
radius of orbit of earth=1.50*10^11m

with this info

and what is angular size definition pls


Unless I'm missing something, I highly doubt it's possible :colonhash:.
(edited 8 years ago)
Original post by Mehrdad jafari
Unless I'm missing something, I highly doubt it's possible :colonhash:.


If you do ocr a its in the book asd

It is from this thread, part b :smile:

http://www.thestudentroom.co.uk/showthread.php?t=2590528
Original post by Mihael_Keehl
If you do ocr a its in the book asd

It is from this thread, part b :smile:

http://www.thestudentroom.co.uk/showthread.php?t=2590528


I see. I believe there is also some astronomy involved here as I didn't do astronomy with AQA and so I really don't know what angular size is. Perhaps you will cover this if you do OCR but here is the module I found online. The question is on page 213.
Use Kepler's third law
Original post by Mehrdad jafari
I see. I believe there is also some astronomy involved here as I didn't do astronomy with AQA and so I really don't know what angular size is. Perhaps you will cover this if you do OCR but here is the module I found online. The question is on page 213.


No proble, thank you for your help :smile:

Original post by MathsAstronomy12
Use Kepler's third law


Perfect username.

Thanks will have a go.
Original post by MathsAstronomy12
Use Kepler's third law


pls provide solution
Original post by Mihael_Keehl
pls provide solution


Hmm, may be the use of

T2=4π2r3GMvT^2= \dfrac{4 \pi^2 r^3}{GM_v}

But then you would have to know the period of its orbit and its mass.
(edited 8 years ago)
Original post by Mehrdad jafari
Hmm, may be the use of

T2=4π2r3GMvT^2= \dfrac{4 \pi^2 r^3}{GM_v}

But then you would have to know the period of its orbit and its mass.


yes I go that lol, I have no idea how supposed to find the mass of venus from the question?
Original post by Mihael_Keehl
yes I go that lol, I have no idea how supposed to find the mass of venus from the question?


You could find it (according to the bear's reasoning, the period of Venus is equal to that of earth) but then that wouldn't be much of help. It definitely would if the density of sun could be assumed to be almost equal to the density of Venus.
(edited 8 years ago)
Original post by Mehrdad jafari
You could find it (according to the bear's reasoning, the period of Venus is equal to that of earth) but then that wouldn't be much of help. It definitely would if the density of sun could be assumed to be almost equal to the density of venues.



I see, thank you for your help :smile:

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