Question

Two one-coulomb point charges are at a distance of 1.67 m from each other. What is the size of the electric force between the two charges?
The mass of the Falcon Heavy rocket is 1421 t. (The letter t stands for metric ton. One metric ton is equal to one thousand kilograms: 1 t = 1,000 kg.) The force between the two point charges above is equal to the weight of how many Falcon Heavy rockets?

Answer 1

Explanation:

The given data is as follows.

       distance (r) = 1.67 m

     $q_{1} = q_{2}$ = 1 C

It is known that formula for electric force between two charges is as follows.

          F = $\frac{kq_{1} \times q_{2}}{r^{2}}$

Hence, putting the given values into the above formula as follows.

       $\frac{9 \times 10^{9} \times 1 \times 1}{(1.67)^{2}}$

            = $3.227 \times 10^{9}$

As it is given that mass of  Falcon Heavy rocket is 1421. Therefore, weight of 1 Falcon rocket is as follows.

       weight of 1 falcon rocket = $142 \times 10^{3} \times 9.8$

Therefore, number of falcon rockets will be calculated as follows.

         No. of falcon rockets = $\frac{3.227 \times 10^{9}}{142000 \times 9.8}$

                              = $2.31897 \times 10^{3}$

                              = 2318.9 falcons

Thus, we can conclude that force between the two point charges above is equal to the weight of 2318.9 Falcon Heavy rockets.