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During space flight, astronauts often refer to forces as multiples of the force of gravity on Earth's surface. What does a force of 5g mean to an astronaut?
If Earth were twice as massive but remained the same size, what would happen to the value of g?


http://hyperphysics.phy-astr.gsu.edu/Hbase/forces/isq.html

http://en.wikipedia.org/wiki/Acceleration_due_to_gravity

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