Solids-are molecules that are together at all times( unless changed by a liquid or gas)
liquid-are molecules that move around freely in 1 space but can be changed to solid or gas
gas- molecules that move around freely and can be hot or cold depending
plasma- a material that goes to forming a cell or a liquid without any structual particles
There you go!
Answer:
Option D is the correct answer.
Explanation:
We equation for elongation
Here we need to find weight required,
We need to stretch a steel road by 2 mm, that is ΔL = 2mm = 0.002 m
E = 200GPa = 2 x 10¹¹ N/m²
L=2m
Substituting
Option D is the correct answer.
At low wind speed, more blades will be better and the blades should be long and wide. The blade pitch should be large. At high wind speed, the blades should be short and thin. The blade pitch should be small then.