Gravity by John Mayer
#21 - Gravity Relationships
(Reference Table p. 1)
m1, m2 two masses
r - distance between
Fg proportional to
Fg , r ??
inversely square
Ex) force on satellite A is 160,000 N, what is the gravitational force on satellite B?
F = 40,000 N
(twice distance, 1/4 the force)
Ex) A rocket weighs 18,000 N at the earth's surface. If the rocket rises to a height where its distance from the earth is 3 earth radii, its weight will be ...
When an object is on the
earth,
Distance from earth to rocket triples so, ....
....weight is 1/9 as great
w = 2000 N
(original weight, 18,000 N)
Enrichment
Determining G, Cavendish
96% of the Universe is "missing"?
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