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June 16, 2024, 03:22:15 am
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Author Topic: Universal Gravitational Relationship Questions  (Read 550 times)  Share 

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Asx4Life

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Universal Gravitational Relationship Questions
« on: June 12, 2011, 11:41:36 pm »
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Does anyone have a way to do these confusing questions? I don't understand this one,

Insight 2010 question 14. A communication satellite called AUSSAT-1 of mass 1200kg is orbiting earth at an altitude of 650km.
At what height above the earth's surface would the satellite's weight be 90% of its weight on the surface of earth? Use gravitational field strength on the surface of earth as 9.8m/s

Thanks
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Vincezor

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Re: Universal Gravitational Relationship Questions
« Reply #1 on: June 12, 2011, 11:48:40 pm »
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Quote from: Asx4Life on June 12, 2011, 11:41:36 pm
Does anyone have a way to do these confusing questions? I don't understand this one,

Insight 2010 question 14. A communication satellite called AUSSAT-1 of mass 1200kg is orbiting earth at an altitude of 650km.
At what height above the earth's surface would the satellite's weight be 90% of its weight on the surface of earth? Use gravitational field strength on the surface of earth as 9.8m/s

Thanks

90% = weight means 90% gravitational field strength



Now sub into







Now to find the height above the surface subtract the radius of the Earth

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Asx4Life

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Re: Universal Gravitational Relationship Questions
« Reply #2 on: June 12, 2011, 11:59:50 pm »
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Quote from: Vincezor on June 12, 2011, 11:48:40 pm
Quote from: Asx4Life on June 12, 2011, 11:41:36 pm
Does anyone have a way to do these confusing questions? I don't understand this one,

Insight 2010 question 14. A communication satellite called AUSSAT-1 of mass 1200kg is orbiting earth at an altitude of 650km.
At what height above the earth's surface would the satellite's weight be 90% of its weight on the surface of earth? Use gravitational field strength on the surface of earth as 9.8m/s

Thanks

90% = weight means 90% gravitational field strength



Now sub into







Now to find the height above the surface subtract the radius of the Earth



Oh thanks!!! Didn't realise it was that easy!!
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