Which of the following statements best describes the gas pressure inside of stars?
Which of the following statements best describes the gas pressures inside of stars? The gas pressure is greatest at the center and decreases toward the star surface.
What percentage of a stars total fusion lifetime is spent as a main-sequence star?
The overall lifespan of a star is determined by its mass. Since stars spend roughly 90% of their lives burning hydrogen into helium on the main sequence (MS), their 'main sequence lifetime' is also determined by their mass.
What percentage of a star’s total lifetime is spent on the main-sequence quizlet?
2) About 90% of the star's total life is spent on the main sequence.
Which of the following stars will spend the most time on the main-sequence?
The Sun spends the most time on the main sequence. 5. In which stage of life will the Sun undergo the most change? The Sun undergoes the most change in size, luminosity and temperature between the two asymptotic giant branches.
What is meant by hydrostatic equilibrium?
In fluid mechanics, hydrostatic equilibrium (hydrostatic balance, hydrostasy) is the condition of a fluid or plastic solid at rest, which occurs when external forces, such as gravity, are balanced by a pressure-gradient force.
Which of the following statements best describes how the planets of the solar system formed?
Which of the following statements best describes how the planets in our solar system formed? They formed from a nebular cloud of dust and gas. They are condensed rings of matter thrown off by a recently formed Sun.
During which of the following phases of life is a star’s pressure and gravity out of equilibrium *?
Astronomy
| Question | Answer |
|---|---|
| During which of the following phases of life is a star's pressure and gravity out of equilibrium? | White dwarf |
| What happens when a main-sequence star exhausts its core hydrogen fuel supply? | The core shrinks while the rest of the star expands. |
How does the energy production in a high mass main sequence star differ from energy production in the Sun?
How does the energy production in a high-mass main sequence star differ from energy production in the Sun? High mass stars produce energy at a faster rate and use carbon in a process that fuses hydrogen to helium. Place in order the stages of nuclear burning that evolving high mass stars experience.
Which statement describes why high mass stars have shorter main sequence lifetimes than low mass stars?
-High-mass main-sequence stars have shorter lifetimes than those of lower-mass stars because high-mass stars burn their fuel at much faster rates.
What defines the main sequence stage of a 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 gravitational or hydrostatic equilibrium?
Hydrostatic equilibrium, also known as gravitational equilibrium, describes a balance between gravity and pressure. Gravity works to contract while pressure works to expand. Hydrostatic equilibrium is the state where the force of gravity pulling inward is balanced by pressure pushing outward.
What is Hydraulic paradox?
What is Hydrostatic Paradox? In fluid dynamics, Hydrostatic Paradox speaks about the liquid pressure at all the points at the same depth(horizontal level). It is defined as: “The pressure at a certain horizontal level in the fluid is proportional to the vertical distance to the surface of the fluid.
Which of the following features of the solar system are explained by the solar nebula theory quizlet?
Which of the following features of the Solar System are explained by the solar nebula theory? Most planets rotate about their axes in the same direction. All estimates of the age of the Solar System are approximately the same. The composition of the outer planets is similar to the Sun's.
What is solar system Short answer?
Definition of solar system : the sun together with the group of celestial bodies that are held by its attraction and revolve around it also : a similar system centered on another star.
What is hydrostatic equilibrium in a star?
A star's life is a constant struggle against the force of gravity. Gravity constantly works to try and cause the star to collapse. The star's core, however is very hot which creates pressure within the gas. This pressure counteracts the force of gravity, putting the star into what is called hydrostatic equilibrium.
What is equilibrium in a star?
It just means that there is not a net overall change in the star. In a stable star, the gas pressure pushing out from the center is equal with the gravity pulling atoms inward to the center – when these forces are equal, the star is at equilibrium.
How does the energy transport differ from a high mass star to that of a low mass star like the Sun?
Energy Production A piece of the star has a lot of energy coming through it from below, and not much energy leaving from above. It can't move this energy fast enough by radiation, so convection kicks in. Low mass stars operate via the p-p chain, which has a relatively weak temperature dependance (E ~ T4).
Which answer best explains how nuclear fusion is the source of a star’s energy?
Which answer best explains how nuclear fusion is the source of a star's energy? When smaller atomic nuclei combine to form a larger atomic nuclei, some of the matter is transformed to energy.
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.
When a star reaches the main sequence its radius is determined by the balance of what two forces?
In the Main Sequence Phase of a star's evolution, radiation pressure pushing outward exactly balances the gravitational pressure pulling inward (this balance is called Hydrostatic Equilibrium). Because these two forces are exactly in balance, the star is stable (this means it neither shrinks nor expands).
What are the phases of a star?
Seven Main Stages of a Star
- Giant Gas Cloud. A star originates from a large cloud of gas. …
- Protostar. When the gas particles in the molecular cloud run into each other, heat energy is produced. …
- T-Tauri Phase. …
- Main Sequence. …
- Red Giant. …
- The Fusion of Heavier Elements. …
- Supernovae and Planetary Nebulae.
What is the protostar stage?
A protostar is a very young star that is still gathering mass from its parent molecular cloud. The protostellar phase is the earliest one in the process of stellar evolution. For a low-mass star (i.e. that of the Sun or lower), it lasts about 500,000 years.
What is hydrostatic condition?
hydrostatic condition: when a fluid velocity is zero, the pressure variation is due only to the weight of the fluid. • There is no pressure change in the horizontal direction. • There is a pressure change in the vertical direction proportional to the density, gravity, and depth change.
What is hydrostatic balance in physics?
In fluid mechanics, hydrostatic equilibrium (hydrostatic balance, hydrostasy) is the condition of a fluid or plastic solid at rest, which occurs when external forces, such as gravity, are balanced by a pressure-gradient force.
What is Pascal’s paradox?
• Pressure depends only on the elevation and. the type of the fluid; NOT on the size of the. fluid container.
What is the pressure paradox?
Hydrostatic paradox deals with the pressure of a liquid at all points of the same horizontal level (depth). It is defined as: “The hydrostatic pressure at a certain horizontal level of a liquid is directly proportional to the distance of the horizontal level from the surface of the liquid”.
What condition in the early solar system was responsible for the formation of two distinct groups of planets?
It is the distance where it was cold enough for hydrogen compounds to condense into ices. Temperature differences led to the formation of two distinct types of planets (terrestrial and jovian) b/c of the temperature at which the materials that make up each type of planet could condense.
What is a solar system formed from a large spherical cloud of gas and dust called?
the solar nebula Part of Hall of the Universe. The Sun and the planets formed together, 4.6 billion years ago, from a cloud of gas and dust called the solar nebula. A shock wave from a nearby supernova explosion probably initiated the collapse of the solar nebula.
What is meant by the solar system Class 6 in Brainly?
Answer: The Solar System is the gravitationally bound system of the Sun and the objects that orbit it, either directly or indirectly. Of the objects that orbit the Sun directly, the largest are the eight planets, with the remainder being smaller objects, the dwarf planets and small Solar System bodies.
What is the name of 8 planets?
The eight planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Mercury is closest to the Sun. Neptune is the farthest. Planets, asteroids, and comets orbit our Sun.