What is a main sequence star?
definition please:)
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Any star that is fusing hydrogen in its core and maintains a stable equilibrium between the inward pressure from gravity and the outward pressure from core nuclear fusion is called the main sequence star.
The main sequence is a continuous and recognisable band of stars in astronomy that may be seen on maps of stellar colour against brightness.
A star produces thermal energy in its dense core area by nuclear fusing hydrogen into helium after condensation and ignition. The star's location on the main sequence at this moment in its existence is mostly based on its mass, but also on factors like its age and chemical makeup.
Main-sequence stars' cores are in a state of hydrostatic equilibrium, where the inward pressure of gravitational collapse from the surrounding layers balances the outward heat pressure of the hot core.
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Related Questions
A car moving with a velocity of 20 meters/second has1.8 * 105 joules of kinetic energy. What is the mass of the car?
Thermal energy is added to a sample, its particles move ?
What is a force that does not involve physical contact between two objects? a. gravitational force c. constant force b. field force d. planetary force?
A ball is dropped from a height of 16 feet. Each time it drops h feet, it rebounds 0.81h feet. Find the total distance traveled by the ball.
B. Superconducting
C. Contact
D. Permanent
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Answer:
C) Contact
Explanation:
The magnet requires almost direct contact with the fridge to start its magnetic properties.
Answer:
Correct Answer is option D (permanent)
Explanation:
Permanent magnet
Permanent magnet is a magnet in which magnetic properties are present even in the absence of an external magnetic field. It has its own magnetic field.
Permanent type of magnetism is present in a magnet that we use to place a photograph on the refrigerator.This permanent magnet is made up of powdered ferrite and liquid plastic. The mixture of ferrite and plastic is heated at a particular temperature and then this heated mixture is placed in a strong magnetic field. Due to this applied magnetic field this mixture is turned into a permanent magnet.
By this method of it requires less material to create a permanent magnet.
I hope this answer will help you.
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Answer:
Explanation:
Potential energy is the energy stored in a body due to the body’s positioning or state.
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!!!!!!!!!!!!!!!
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Answer:
vB = 15.4 m/s
Explanation:
Principle of conservation of energy:
Because there is no friction the mechanical energy is conserve
ΔE = 0
ΔE : mechanical energy change (J)
K : Kinetic energy (J)
U: Potential energy (J)
K = (1/2)mv²
U = m*g*h
Where :
m: mass (kg)
v : speed (m/s)
h : hight (m)
Ef - Ei = 0
(K+U)final - (K+U)initial =0
(K+U)final = (K+U)initial
((1/2)mv²+m*g*h)final = ((1/2)mv²+m*g*h)initial , We divided by m both sides of the equation:
((1/2)vB² + g*hB = (1/2 )vA²+ g*hA
(1/2) (vB)² + (9.8)*(14.7) = 0 + (9.8)(26.8 )
(1/2) (vB)² = (9.8)(26.8 ) - (9.8)*(14.7)
(vB)² = (2)(9.8)(26.8 - 14.7)
(vB)² = 237.16
vB = 15.4 m/s : speed of the cart at B
Answer:
the guy above me is correct
Explanation:
inclined plane AND pulley
B)
lever AND wheel-and-axle
C)
pulley and lever
D)
wheel-and axle AND inclined plane
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B) air mass
C) air density
D) temperature
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A weather station model depicts many weather elements such as wind speed and direction, cloud type, cloud cover, temperature, dew point and others. However, options A, B, and C are not depicted.
d, temperature
its the right answer on the test !! :D