Physics
Chemistry
Physical science is science which studies non-living things.This covers things on earth to the universe.The main branches are physics and chemistry.The other sub-branches are Astronomy, meteorology and Geology.Physics is concerned with the basic principals of matter and energy.It covers concepts in motion, energy, force, pressure , light and many other areas we encounter in our day to day life.Chemistry is concerned with composition of matter and how it reacts.Material in chemistry is understood through observing molecules, atoms, elements and their interaction in nature including their properties.Chemistry is further divided into organic chemistry and natural chemistry sub-branches.
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There are 8 electrons in the third energy level of Calcium atom.
Hydropower is the most commonly used renewable energy source in the US follwed by wind energy.
Wind energy makes blades rotate which spins the generator to create the elctricity. Thats the principle of wind energy whereas hydropower works on the simple principle called *conservation of energy* in which potential energy of the water is converted into Kinetic energy which helps to rotate the turbines.
Solar energy can be used in space and we have already installed them in ISS(International Space Station)
Answer:
D
Explanation:
Why is because the merry go round wont do anything cause he will stay the same speed.