It is D, the distance between each object squared. We get this from solving for the force of gravity, which is
F = G((m1*m2)/(r^2)).
Here, you can see that the masses of the two objects are divided by their total distance apart from each other (r) squared.
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Answer: 14.7 N
Explanation:
The weight of an object on Earth is given by
![W=mg](https://tex.z-dn.net/?f=W%3Dmg)
where
m is the mass of the object
is the acceleration due to gravity on Earth's surface
In this problem, we have a book of mass m=1.5 kg, so its weight is given by
![W=mg=(1.5 kg)(9.81 m/s^2)=14.7 N](https://tex.z-dn.net/?f=W%3Dmg%3D%281.5%20kg%29%289.81%20m%2Fs%5E2%29%3D14.7%20N)