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BlackZzzverrR [31]

2 years ago

5

A road sign says "Tucson, Arizona - 120 miles." How many kilometers is this?

2 answers:

miss Akunina [59]2 years ago

6 0

Slightly less than 200.

The distance in kilometers is equal to the distance in miles multiplied by 1.609344.

Irina-Kira [14]2 years ago

3 0

Slightly less than 200 (193)

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Two electrons with a charge of magnitude 1.6×10-19 C in an atom are separated by 1.5×10-10 m, the typical size of an atom. What

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$1.02\cdot 10^{-8} N$ , repulsive

Explanation:

The magnitude of the electric force between two charged particles is given by Coulomb's law:

$F=k\frac{q_1 q_2}{r^2}$

where:

$k=8.99\cdot 10^9 Nm^{-2}C^{-2}$ is the Coulomb's constant

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r is the separation between the two charges

The force is:

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- Attractive if the two charges have opposite signs

In this problem, we have two electrons, so:

$q_1=q_2=1.6\cdot 10^{-19}C$ is the magnitude of the two electrons

$r=1.5\cdot 10^{-10} m$ is their separation

Substituting into the formula, we find the electric force between them:

$F=(8.99\cdot 10^9)\frac{(1.6\cdot 10^{-19})^2}{(1.5\cdot 10^{-10})^2}=1.02\cdot 10^{-8} N$

And the force is repulsive, since the two electrons have same sign charge.

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