For the quiz it's both a and b. Otherwise known as D.
The majority of electricity is generated at a power station by electromechanical generators, primarily driven by heat engines fueled by combustion or nuclear fission but also by other means such as the kinetic energy of flowing water and wind.
Here is the answer:
Mass= 3kg
Acceleration =4m/s
Putting the formula:
F=m*s
F=3*4
F=12N( Newton is the S.l unit of force)
Answer: Option D.
Crystalline and rigid.
Explanation:
When liquid freezes to ice, it becomes solid and this is crystalline and rigid because a solids for crystals which means solid atoms, molecules or ions are orderly arranged in structures which form of crystal lattice in all sides. The structure of solid becomes rigid , it does not take the container shape like liquid and it does not expand also like liquid. it volumes reduces.
