I’m soooo confusing with what your question is lol
Kepler's Laws of Planetary Motion. While Copernicus rightly observed that the planets revolve around the Sun, it was Kepler who correctly defined their orbits.
Sorry about the holds, copied it from google...
Answer:
it should be the second one since London dispersion causes interaction between molecules.
hope I helped.
Answer:
A machine have 75% efficiency means 25% of efficiency has been lost due to friction and a machine can work 75% only.
The surface would be flat