# OCR A physics help

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#1
A satellite of mass 3000 kg moves from a parking orbit of radius 6800 km to a geostationary
orbit of radius 42 000 km. The mass of the Earth is 6.0 × 1024 kg. What is the magnitude of the change in gravitational potential?
A 8.4 J kg-1
B 2.5×104Jkg-1
C 4.9×107Jkg-1
D 1.5 × 1011 J kg -1
0
1 year ago
#2
A satellite of mass 3000 kg moves from a parking orbit of radius 6800 km to a geostationary
orbit of radius 42 000 km. The mass of the Earth is 6.0 × 1024 kg. What is the magnitude of the change in gravitational potential?
A 8.4 J kg-1
B 2.5×104Jkg-1
C 4.9×107Jkg-1
D 1.5 × 1011 J kg -1
What is it that you don't know? It is applying the equation of gravitational potential .
0
#3
(Original post by Eimmanuel)
What is it that you don't know? It is applying the equation of gravitational potential .
I don’t know how to get the answer, it is C but I can’t get it. You are supposed to use square root GMm/r
0
1 year ago
#4
I don’t know how to get the answer, it is C but I can’t get it. You are supposed to use square root GMm/r
What is square root GMm/r?
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#5
(Original post by Eimmanuel)
What is square root GMm/r?
That is the formula is think that you use
0
1 year ago
#6
That is the formula is think that you use
I am asking you what does it represent? And are you this is formula that you are supposed to apply. The formula that you should apply is gravitational potential is given to you in post #2.
https://www.s-cool.co.uk/a-level/phy...onal-potential
0
1 year ago
#7
A satellite of mass 3000 kg moves from a parking orbit of radius 6800 km to a geostationary
orbit of radius 42 000 km. The mass of the Earth is 6.0 × 1024 kg. What is the magnitude of the change in gravitational potential?
A 8.4 J kg-1
B 2.5×104Jkg-1
C 4.9×107Jkg-1
D 1.5 × 1011 J kg -1
I don’t know how to get the answer, it is C but I can’t get it. You are supposed to use square root GMm/r
You need to find the gravitational potential at radius 6800 km first. Then find the gravitational potential at radius 42 000 km. Lastly compute the difference.
0
#8
(Original post by Eimmanuel)
I am asking you what does it represent? And are you this is formula that you are supposed to apply. The formula that you should apply is gravitational potential is given to you in post #2.
https://www.s-cool.co.uk/a-level/phy...onal-potential
Thanks, was just using the wrong formula
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