An electric current flows when electrons move through a conductor, such as a metal wire. The moving electrons can collide with the ions in the metal. This makes it more difficult for the current to flow, and causes resistance.
Answer: The answer is electricity and magnetism.
Explanation: The atom's center, or nucleus, is positively charged and the electrons that whirl around this nucleus are negatively charged, so they attract each other. The reason the force is strong is because the atom is so small.
Answer:
0.51 m
Explanation:
Using the principle of conservation of energy, change in potential energy equals to the change in kinetic energy of the spring.
Kinetic energy, KE=½kx²
Where k is spring constant and x is the compression of spring
Potential energy, PE=mgh
Where g is acceleration due to gravity, h is height and m is mass
Equating KE=PE
mgh=½kx²
Making x the subject of formula
![x=\sqrt {\frac {2mgh}{k}}](https://tex.z-dn.net/?f=x%3D%5Csqrt%20%7B%5Cfrac%20%7B2mgh%7D%7Bk%7D%7D)
Substituting 9.81 m/s² for g, 1300 kg for m, 10m for h and 1000000 for k then
![x=\sqrt \frac {2*1300*9.81*10}{1000000}=0.50503465227646m\\x\approx 0.51 m](https://tex.z-dn.net/?f=x%3D%5Csqrt%20%5Cfrac%20%7B2%2A1300%2A9.81%2A10%7D%7B1000000%7D%3D0.50503465227646m%5C%5Cx%5Capprox%200.51%20m)
Answer:
Since velocity is a vector quantity there is no net displacement and the average velocity is zero
(A) is correct
B, because neutrons contain no charge, therefore dont affect the charge of the atom