1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Semenov [28]
3 years ago
9

Need help! Need help! Need help! Need help! Need help! Need help!

Physics
1 answer:
Maslowich3 years ago
5 0

Answer:

i can help you i know this answer

You might be interested in
What is the first step in the formation of a protostar?
Fittoniya [83]

Star formation begins in relatively small molecular clouds called dense cores.[7] Each dense core is initially in balance between self-gravity, which tends to compress the object, and both gas pressure and magnetic pressure, which tend to inflate it. As the dense core accrues mass from its larger, surrounding cloud, self-gravity begins to overwhelm pressure, and collapse begins. Theoretical modeling of an idealized spherical cloud initially supported only by gas pressure indicates that the collapse process spreads from the inside toward the outside.[8] Spectroscopic observations of dense cores that do not yet contain stars indicate that contraction indeed occurs. So far, however, the predicted outward spread of the collapse region has not been observed.[9]

The gas that collapses toward the center of the dense core first builds up a low-mass protostar, and then a protoplanetary disk orbiting the object. As the collapse continues, an increasing amount of gas impacts the disk rather than the star, a consequence of angular momentum conservation. Exactly how material in the disk spirals inward onto the protostar is not yet understood, despite a great deal of theoretical effort. This problem is illustrative of the larger issue of accretion disk theory, which plays a role in much of astrophysics.

Regardless of the details, the outer surface of a protostar consists at least partially of shocked gas that has fallen from the inner edge of the disk. The surface is thus very different from the relatively quiescent photosphere of a pre-main sequence or main-sequence star. Within its deep interior, the protostar has lower temperature than an ordinary star. At its center, hydrogen is not yet undergoing nuclear fusion. Theory predicts, however, that the hydrogen isotope deuterium is undergoing fusion, creating helium-3. The heat from this fusion reaction tends to inflate the protostar, and thereby helps determine the size of the youngest observed pre-main-sequence stars.[11]

The energy generated from ordinary stars comes from the nuclear fusion occurring at their centers. Protostars also generate energy, but it comes from the radiation liberated at the shocks on its surface and on the surface of its surrounding disk. The radiation thus created most traverse the interstellar dust in the surrounding dense core. The dust absorbs all impinging photons and reradiates them at longer wavelengths. Consequently, a protostar is not detectable at optical wavelengths, and cannot be placed in the Hertzsprung-Russell diagram, unlike the more evolved pre-main-sequence stars.

The actual radiation emanating from a protostar is predicted to be in the infrared and millimeter regimes. Point-like sources of such long-wavelength radiation are commonly seen in regions that are obscured by molecular clouds. It is commonly believed that those conventionally labeled as Class 0 or Class I sources are protostars.[12][13] However, there is still no definitive evidence for this identification.

4 0
3 years ago
Lillie is running. She increases her initial speed of 30 km/h to 40 km/h so she can win the race. If she takes 0.05 hours to com
Ganezh [65]

Explanation:

First convert the speed into m/s and time into seconds

5 0
2 years ago
How many planets in the solar system
Nataliya [291]

Answer:

There are eight planets in our Solar System.

Explanation:

7 0
3 years ago
Read 2 more answers
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the pla
Rama09 [41]
Please elaborate more on your question so I can help you
7 0
3 years ago
I can use everything on my body to advance the ball but what?
ddd [48]
The answer would be hands! hope this helps
5 0
3 years ago
Other questions:
  • Which statement describes a difference between electromagnetic and mechanical waves? A. Mechanical waves do not transfer energy,
    12·1 answer
  • A student constructed a series circuit consisting of a 12.0-volt battery, a 10.0-ohm lamp, and a
    14·1 answer
  • A steel casting weighing 2 kg has an initial temperature of 500°c; 25 kg of water initially at 25°c is contained in a perfectly
    12·2 answers
  • Most scientific questions are based on
    10·2 answers
  • Which of the following statements concerning the electric field inside a conductor is true?
    8·1 answer
  • You drop some ice and notice a piece appears to slide across the kitchen floor without slowing down (until it hits the wall). wh
    9·2 answers
  • Describe how sound waves are produced by the drum and then heard.
    11·1 answer
  • Which of these is an example of a chemical change?
    8·2 answers
  • g Determine the magnetic field midway between two long straight wires 2.0 cm apart in terms of the current I in one when the oth
    10·1 answer
  • What is the difference between reflection and refraction? What changes and what does not change.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!