Work can be calculated with the equation: Work = Force × Distance. The SI unit for work is the joule (J), or Newton. meter (N. ... One joule equals the amount of work that is done when 1 N of force moves an object over a distance of 1 m
They are related because they both have a potential to store energy
As we know that electrostatic force between two charges is given as
![F = \frac{kq_1q_2}{r^2}](https://tex.z-dn.net/?f=F%20%3D%20%5Cfrac%7Bkq_1q_2%7D%7Br%5E2%7D)
here we know that electrostatic repulsion force is balanced by the gravitational force between them
so here force of attraction due to gravitation is given as
![F_g = 1.98 \times 10^{20} N](https://tex.z-dn.net/?f=F_g%20%3D%201.98%20%5Ctimes%2010%5E%7B20%7D%20N)
here we can assume that both will have equal charge of magnitude "q"
now we have
![1.98 \times 10^{20} = \frac{kq^2}{r^2}](https://tex.z-dn.net/?f=1.98%20%5Ctimes%2010%5E%7B20%7D%20%3D%20%5Cfrac%7Bkq%5E2%7D%7Br%5E2%7D)
![1.98 \times 10^{20} = \frac{(9\times 10^9)(q^2)}{(3.84 \times 10^8)^2}](https://tex.z-dn.net/?f=1.98%20%5Ctimes%2010%5E%7B20%7D%20%3D%20%5Cfrac%7B%289%5Ctimes%2010%5E9%29%28q%5E2%29%7D%7B%283.84%20%5Ctimes%2010%5E8%29%5E2%7D)
![1.98 \times 10^{20} = (6.10 \times 10^{-8}) q^2](https://tex.z-dn.net/?f=1.98%20%5Ctimes%2010%5E%7B20%7D%20%3D%20%286.10%20%5Ctimes%2010%5E%7B-8%7D%29%20q%5E2)
now we have
![q = 5.7 \times 10^{13} C](https://tex.z-dn.net/?f=q%20%3D%205.7%20%5Ctimes%2010%5E%7B13%7D%20C)
Answer:
Less than
Explanation:
Speed of sound increases with density of the medium. Since wood is less dense than water, the speed of sound is lower in wood.