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Homework Statement
A comet is affected by a gravitational force due to the presence of the Earth. Later, the comet is ten times farther from the Earth. What is the size of the new gravitational force acting on the comet?
a) One hundred times larger than before.
b) Ten times larger than before.
c) One tenth as large as before.
d) One hundredth as large as before.
Based on what I'm given, gravitational force is inversely proportional to the square of the distance (r). So if the distance is 10, don't you just square 10 to get 100 times larger? I'm kinda stuck between a or d I don't know why =p
Also for the question on the attachment (sorry for the horrendous quality) I can't seem to narrow down the choices given that I don't understand what each choice means. All I know is that newtons third law is equal and opposite force but I can't find a corresponding answer that upholds the statement.
Homework Equations
Fgrav= GM1M2/r^2
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