What forces are in balance inside a star?
Inside a star, the inward force of gravity is balanced by the outward force of pressure.
What are two forces in balance for any star on the main line sequence?
In order for the main-sequence star to be maintained, a balance is required between the force of pressure, which is provided by nuclear fusion and the release of energy, and the force of gravity.
What processes are in balance to keep a star in the main sequence?
Stars in the main sequence have achieved a state of equilibrium, which means that the forces pushing in and the forces pushing out are equal and balance each other out. As long as the star has enough fuel in its core to continue its fusion reaction, the star will maintain equilibrium and stay a main sequence star.
What balances the pressure force of a star on the main sequence?
The star turns on and becomes a main sequence star, powered by hydrogen fusion. Fusion produces an outward pressure that balances with the inward pressure caused by gravity, stabilizing the star.
When a star is in its main sequence what forces are acting and why is the star stable?
During the main sequence period of its life cycle a star is stable because the forces in it are balanced. The outward pressure from the expanding hot gases is balanced by the force of the star's gravity. … Gravity pulls smaller amounts of dust and gas together which form planets in orbit around the star.
What happens to the star in the main sequence stage?
Stars in the main-sequence stage give out energy as light and heat. This energy is released by nuclear fusion reactions deep in their cores. The reactions fuse hydrogen nuclei to create helium. Stars spend about 90% of their lives in this stage.
What are the two main forces acting on the star?
Gravitational forces act to contract the star. Fusion reactions and heat convection act to expand the star. The two forces are balanced and the star remains stable in size and reactions. The star remains stable as long as hydrogen exists to combine in fusion reactions.
What makes a star a main sequence star?
Definition of a Main Sequence Star A main sequence star is any star that is fusing hydrogen in its core and has a stable balance of outward pressure from core nuclear fusion and gravitational forces pushing inward.
What is the force that keeps a main sequence star from collapsing?
Stars on the main sequence are those that are fusing hydrogen into helium in their cores. The radiation and heat from this reaction keep the force of gravity from collapsing the star during this phase of the star's life.
What forces are balanced in a stable main sequence star like the Sun state what the force is and in what direction the force acts inwards outwards etc?
All main sequence stars (including the Sun) are in hydrostatic equilibrium. That is, the inward force of gravity, which tends to compress the star, is balanced by the outward force due to the pressure.
What is the reason a main sequence star is so stable?
The cores of main-sequence stars are in hydrostatic equilibrium, where outward thermal pressure from the hot core is balanced by the inward pressure of gravitational collapse from the overlying layers. The strong dependence of the rate of energy generation on temperature and pressure helps to sustain this balance.
What are the outward forces that act on a star What are the inward forces How do these compare?
1 Answer. Pressure and gravity. Pressure due to fusion reactions pushes outwards. Gravity pulls inwards to keep the star in equilibrium.
Which of the following occurs in a main sequence star?
Nucleosynthesis and Fusion Reactions. Nucleosynthesis simply refers to the production of nuclei heavier than hydrogen. This occurs in main sequence stars through two main processes, the proton-proton chain and the CNO cycle (carbon, nitrogen, oxygen).
What forces are balanced in a stable main sequence star like the sun state what the force is and in what direction the force acts inwards outwards etc?
All main sequence stars (including the Sun) are in hydrostatic equilibrium. That is, the inward force of gravity, which tends to compress the star, is balanced by the outward force due to the pressure.
What happens during the main sequence star stage?
Stars in the main-sequence stage give out energy as light and heat. This energy is released by nuclear fusion reactions deep in their cores. The reactions fuse hydrogen nuclei to create helium. Stars spend about 90% of their lives in this stage.
What is the force that keeps a main sequence star from collapsing on itself quizlet?
The cloud fragments into smaller clouds and forms many stars at one time. What is the force that keeps a main sequence star from collapsing on itself? mass.
What happens during main sequence star?
Main sequence stars fuse hydrogen atoms to form helium atoms in their cores. About 90 percent of the stars in the universe, including the sun, are main sequence stars.
What happens in main sequence star?
Main-sequence stars with more than two solar masses undergo convection in their core regions, which acts to stir up the newly created helium and maintain the proportion of fuel needed for fusion to occur. Below this mass, stars have cores that are entirely radiative with convective zones near the surface.
What are the inward and outward forces that act on a star which force is stronger on the Sun?
What are the outward and inward forces that act on a star? the outward force that acts on a star is thermal pressure. the inward force that acts on a star is gravity.
What keeps a main sequence star from collapsing?
Main Sequence Stars Stars are fueled by the nuclear fusion of hydrogen to form helium deep in their interiors. The outflow of energy from the central regions of the star provides the pressure necessary to keep the star from collapsing under its own weight, and the energy by which it shines.
What happens during the main sequence of a star?
When the protostar starts fusing hydrogen, it enters the "main sequence" phase of its life. Stars on the main sequence are those that are fusing hydrogen into helium in their cores. The radiation and heat from this reaction keep the force of gravity from collapsing the star during this phase of the star's life.
What happens in the main sequence of a star phase?
Stars in the main-sequence stage give out energy as light and heat. This energy is released by nuclear fusion reactions deep in their cores. The reactions fuse hydrogen nuclei to create helium. Stars spend about 90% of their lives in this stage.