A40-kg boy is standing on the edge of a stationary 30-kg circular platform that is free to rotate. the boy tries to walk around the platform in a counterclockwise direction. as he does:

Applied Force.

Gravitational Force.

Normal Force.

Frictional Force.

Air Resistance Force.

Tension Force.

Spring Force.

Explanation:

Due to the limit in the atomic structure of the massive stars, stars tend to evolve into white dwarfs. The evolution of the stars into white dwarf will lead the components of the stars to fuse in order to it maintain its cores.

Nuclear fusion is important to stars as it will decide the life of the stars. The nuclear fusion in stars starts with the fusion of helium after it burns out it will switch into carbon burning then after the carbon is used up, neon will then be used then magnesium, silicon and when it reaches the iron it will stop.

Nuclear fusion in massive stars stops in iron because the atoms of iron are tightly bound and there is no energy that can be consumed and used. Even though iron can be fused, the nuclear fusion reaction in iron absorbs energy rather than gives off. Since energy is being absorbed, the temperature will cool down and it is the death of the star.

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