Using Newton's Law of Gravitation, which of the following examples will
experience a weaker gravitational force?
Objects are a distance of 3D (D= distance) apart.
b Objects are a distance of 1D apart.
O Both will be weak.
OA
O Both will be strong.
OB



Answer :

To solve this problem, we will use Newton's Law of Gravitation formula:

[tex]\[ F = G \frac{m_1 \cdot m_2}{r^2} \][/tex]

Where:
- [tex]\( F \)[/tex] is the gravitational force between two masses,
- [tex]\( G \)[/tex] is the gravitational constant ([tex]\(6.674 \times 10^{-11} \, \text{N m}^2/\text{kg}^2\)[/tex]),
- [tex]\( m_1 \)[/tex] and [tex]\( m_2 \)[/tex] are the masses,
- [tex]\( r \)[/tex] is the distance between the centers of the two masses.

Given two scenarios where the distance between the objects is different, we need to determine which configuration results in a weaker gravitational force.

### Scenario A: Distance is 3D

In this scenario, the objects are 3D apart. Substituting 3D for [tex]\( r \)[/tex] in the gravitational force formula, we get:

[tex]\[ F_A = G \frac{m_1 \cdot m_2}{(3D)^2} = G \frac{m_1 \cdot m_2}{9D^2} \][/tex]

### Scenario B: Distance is 1D

For the second scenario, the objects are 1D apart. Substituting 1D for [tex]\( r \)[/tex] in the gravitational force formula, we obtain:

[tex]\[ F_B = G \frac{m_1 \cdot m_2}{(1D)^2} = G \frac{m_1 \cdot m_2}{D^2} \][/tex]

### Comparison

To determine which force is weaker, compare the two forces directly.

[tex]\[ \frac{F_A}{F_B} = \frac{G \frac{m_1 \cdot m_2}{9D^2}}{G \frac{m_1 \cdot m_2}{D^2}} = \frac{1}{9} \][/tex]

This ratio tells us that [tex]\( F_A \)[/tex] is [tex]\(\frac{1}{9}\)[/tex] of [tex]\( F_B \)[/tex]. In other words, the force when the distance is 3D is nine times weaker than the force when the distance is 1D.

### Conclusion

The objects that are a distance of 3D apart will experience a weaker gravitational force compared to the objects that are only a distance of 1D apart. Thus, the correct answer is:

A) Objects are a distance of 3D apart.

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