# Physics

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What is the gravitational field strength at a place 220km above Earth's surface, the altitude of many piloted space flights?

• Physics -

Newtons law of gravity:

• Physics -

k well i don't know what Me stands for or what the altitude is or how to find it.

• Physics -

You should know Newtons Law.

Me is mass of the Earth.
altitude is 220Km, given.

• Physics -

well my teacher cant teach so i dont. and i used the formula but i got a different answer then the back of the book. i don't get what im doing wrong.
g=(6.67x10*-11Nm^2/kg^2)x(5.98x10*24kg)/ (6.38X10*6m+0.22m)^2
g= (3.99x10*14Nm^2/kg)/(4.07x10*13m^2)
g=9.8N/kg
the back of the book says 9.1N/kg

• Physics -

well my teacher cant teach so i dont. and i used the formula but i got a different answer then the back of the book. i don't get what im doing wrong.
g=(6.67x10*-11Nm^2/kg^2)x(5.98x10*24kg)/ (6.38X10*6m+0.22m)^2
g= (3.99x10*14Nm^2/kg)/(4.07x10*13m^2)
g=9.8N/kg
the back of the book says 9.1N/kg

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