The force between a 100 kg man and the Earth is 980 N. How close must two protons (1.6 X 10-19 C) be to generate the same force?

Respuesta :

The distance between two protons to generate 950N of force is 0.49 X 10⁻¹⁵ m

Explanation:

Given:

Mass of man, m = 100 kg

Force between man and earth = 980 N

Charge of proton, q = 1.6 X 10⁻¹⁹C

Same force is generated between them

Distance between two protons, r = ?

According to Coulomb's law:

[tex]F = k\frac{q_1q_2}{r^2}[/tex]

where,

k is Coulomb's constant

k = 9 X 10⁹ Nm²/C²

According to the question:

[tex]950 = k\frac{q_1q_2}{r^2}[/tex]

Solving the equation:

[tex]950 = (9X10^9) X\frac{(1.6 X 10^-^1^9 X 1.6 X 10^-^1^9)}{r^2} \\\\r^2 = \frac{(9 X 10^9) (1.6 X 10^-^1^9 X 1.6 X 10^-^1^9)}{950} \\\\r^2 = 0.024 X 10^-^2^9\\\\r^2 = 0.24 X 10^-^3^0\\\\r = 0.49 X 10^-^1^5 m[/tex]

Therefore, the distance between two protons to generate 950N of force is 0.49 X 10⁻¹⁵ m

The distance between two protons will be "0.49 × 10⁻¹⁵ m". To understand the calculation, check below.

Force and Distance

According to the question,

Man's mass, m = 100 kg

Force, F = 980 N

Proton's charge, q = 1.6 × 10⁻¹⁹ C

Coulomb's constant, k = 9 × 10⁹ Nm²/C²

By using the Coulomb's law,

→  F = k [tex]\frac{q_1 q_2}{r^2}[/tex]

By substituting the values,

950 = 9 × 10⁹ × [tex]\frac{1.6\times 10^{-19}\times 1.6\times 10^{-19}}{r^2}[/tex]

By applying cross-multiplication,

    r² = [tex]\frac{(9\times 10^9)(1.6\times 10^{-19}\times 1.6\times 10^{-19})}{950}[/tex]

        = 0.024 × 10⁻³⁰

      r = 0.49 × 10⁻¹⁵ m

Thus the approach above is appropriate,

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