Select the correct answer.

What is the force of gravity between Earth ([tex]$6.0 \times 10^{24}$[/tex] kilograms) and an object at a distance of [tex]$10^{10}$[/tex] meters? (The value of [tex]$G$[/tex] is [tex]$6.673 \times 10^{-11}$[/tex] newton meter[tex]$^2$[/tex] / kilogram[tex]$^2$[/tex])

A. 13.52 newtons
B. 51.39 newtons
C. [tex]$13.52 \times 10^{17}$[/tex] newtons
D. [tex]$51.39 \times 10^{17}$[/tex] newtons



Answer :

To find the force of gravity between Earth and an object [tex]\(10^{10}\)[/tex] meters away, we use the formula for gravitational force:

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

Where:
- [tex]\( F \)[/tex] is the gravitational force,
- [tex]\( G \)[/tex] is the gravitational constant [tex]\((6.673 \times 10^{-11} \, \text{N}\cdot \text{m}^2/\text{kg}^2)\)[/tex],
- [tex]\( m_1 \)[/tex] is the mass of the Earth [tex]\((6.0 \times 10^{24} \, \text{kg})\)[/tex],
- [tex]\( m_2 \)[/tex] is the mass of the other object (we assume it to be 1 kg for simplicity),
- [tex]\( r \)[/tex] is the distance between the centers of the two masses [tex]\((10^{10} \, \text{m})\)[/tex].

Substitute the values into the formula:

[tex]\[ F = 6.673 \times 10^{-11} \times \frac{(6.0 \times 10^{24}) \times 1}{(10^{10})^2} \][/tex]

Calculate the denominator and the numerator separately:

[tex]\[ (10^{10})^2 = 10^{20} \][/tex]

[tex]\[ 6.0 \times 10^{24} \times 1 = 6.0 \times 10^{24} \][/tex]

Now, divide the numerator by the denominator and multiply by the gravitational constant:

[tex]\[ F = 6.673 \times 10^{-11} \times \frac{6.0 \times 10^{24}}{10^{20}} \][/tex]

[tex]\[ F = 6.673 \times 10^{-11} \times 6.0 \times 10^{4} \][/tex]

[tex]\[ F = 6.673 \times 6.0 \times 10^{-11+4} \][/tex]

[tex]\[ F = 40.038 \times 10^{-7} \][/tex]

[tex]\[ F = 4.0038 \times 10^{-6} \][/tex]

Therefore, the calculated gravitational force is [tex]\(4.0038 \times 10^{-6} \, \text{newtons}\)[/tex].

After comparing the calculated force with the given options (13.52 newtons, 51.39 newtons, 13.52 × 10^{17} newtons, 51.39 × 10^{17} newtons), none of them matches the correct result in the problem.

Hence, the correct answer would be:

None of the above.