Astronomy help with gravitational forces?

Question

I think the answer is C, but I can see how others would make sense. Thanks!


Small objects are bound together primarily by chemical bonds based on electromagnetic forces --- not gravity. Chemical bonds have a short range due to the overall electrical neutrality of matter. In other words, atoms interact with their nearest neighbors only and not those far away. Thus, structures held together primarily by chemical bonds (or, if you will, electromagnetic forces) can take on irregular shapes, like you and me. Gravity, however, acts on neutral matter and is a long range force. An atom anywhere on Earth interacts gravitationally with every other atom on Earth (and, indeed, with every other atom in the universe). You can always tell when gravity is the dominant force holding together any structure. The structure must be large and, when large enough that gravity dominates other types of forces because of the multiplicity of small interactions, it will naturally assume a spherical shape. The Roche limit applies only to objects held together primarily by gravitational forces. Small structures held together primarily by chemical bonds are too strongly bound to be ripped apart by differential gravitational (tidal forces) except under the extreme gravitational conditions that occur near a neutron star or black hole. This description of chemical bonds and gravitational forces explains why _______.
(a) artificial satellites can orbit the Earth at distances on the order of 150 miles above its surface.
(b) the Moon can orbit the Earth at distances on the order of 239,000 miles above its surface.
(c) even dense objects like neutron stars can get swallowed up by black holes if they get near enough to them.
(d) the Roche limit isn’t really a “good” limit.
(e) gravity is the strongest of the four known fundamental forces in nature.

Answer 1

Mostly NO.

1. Electrical forces decrease with the square of the distance just as gravity does.

2. There are small irregularly shaped gravity bound objects (see pictures of

potato shaped close pass asteroids)

3. Roche limit forces overcome both gravitational and chemical bond forces in solid objects.

4. Gravity is a weak force.

Answer 2

Earth exerts a extra valuable gravitational tension on the moon. the mass of the Earth is 5.9742 × 10^24 kilograms on an identical time as the mass of the moon is 7.36 × 10^22 kilograms. The Earth is almost two times as dense because of the fact the moon. As for the consequence of the moon's gravity in the international you are able to discover it interior the tides and a few climate phenomena and that i'm specific it impacts us in different techniques yet thats the perfect answer i will provide you.

Answer 3

Yea it's C