Question #0031c

1 Answer
yumean1119
Nov 17, 2017

Use the law of universal gravitaion.

Explanation:

This question is too vague to answer, but if you are refering to universal gravity between an object and the earth, use the law of universal gravitation.

#F=(GMm)/r^2# where
#F#: force,
#G#: gravitational constant(#G=6.67*10^-11 m^3kg^-1s^-2#),
#M#: mass of the earth,
#m#: mass of the object, and
#r#: distanse between the center of gravity of the object and that of the earth.

If an object is at the height #h=R# from the earth surface, substitute #r=2R# to the formula.
Since the universal gravity is proportional to #r^-2#, the force of gravity at #h=R" "(r=2R)# will be one-forth of the force at #h=0" "(r=R)#.

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