MYTUTOR SUBJECT ANSWERS

104 views

Describe and explain the first stages of the life cycle of a star before it reaches the main sequence.

The star begins as a stellar nebulae. This is a dense cloud of gas and dust containing hydrogen and helium. As it is under a large amount of gravitational pressure, this nebula will then collapse under gravity and heat up. This occurs due to the conversion of gravitational potential energy to thermal kinetic energy. This collapse results in a disc shaped clump of matter with the centre of gravity focused at the core. This is known as a protostar. Some of the interstellar dust can be ejected during this process. Once the protostar has formed, the dust in the surrounding disc can clump to form planets and often moons. This forms a pre-main sequence star. Eventually, the gravitational pressure will become sufficient to then allow fusion to occur. During this process, hydrogen nuclei convert to helium nuclei resulting in an overall release of a large amount of energy. The star then becomes stable as the outwards push force from nuclear fusion is in equilibrium with the inwards pull force from gravity. This then forms the main sequence star.

Laura B. GCSE Chemistry tutor, A Level Chemistry tutor, A Level Furth...

3 months ago

Answered by Laura, who has applied to tutor A Level Physics with MyTutor

Still stuck? Get one-to-one help from a personally interviewed subject specialist

48 SUBJECT SPECIALISTS

£26 /hr

James L.

Degree: Medical Sciences (Bachelors) - Exeter University

Subjects offered: Physics, Science+ 3 more

Physics
Science
Maths
Chemistry
Biology

“Hi, I'm James, a 2nd year Medical Science student. I'm really passionate about science, and I hope i can share some of it with you! ”

£20 /hr

Peter H.

Degree: Mathematics (Bachelors) - Durham University

Subjects offered: Physics, Maths+ 2 more

Physics
Maths
Further Mathematics
.STEP.

“About me: I am a Mathematics student at Durham University, and I am currently in my 3rd year. I would very much like to give assistance and help students of all abilities to reach the goals they aspire to in Maths and Physics, whether...”

MyTutor guarantee

£20 /hr

Ben A.

Degree: Medicine (Bachelors) - University College London University

Subjects offered: Physics, Maths+ 6 more

Physics
Maths
Chemistry
Biology
.UKCAT.
.BMAT (BioMedical Admissions)
-Personal Statements-
-Medical School Preparation-

“Hello,I am a first year medical student at University College London, When I was in sixth form, I helped tutor the younger years and I always enjoyed it, so I decided to keep it on in my university years.My subjects are the three m...”

About the author

£20 /hr

Laura B.

Degree: Natural Sciences (Physical) (Masters) - Cambridge University

Subjects offered: Physics, Maths+ 4 more

Physics
Maths
Further Mathematics
Chemistry
-Personal Statements-
-Oxbridge Preparation-

“Introduction: Hi, my name is Laura and I study Physical Natural Sciences at Cambridge University. I am a friendly and enthusiastic person who has always enjoyed learning and teaching both Science and Maths.  Qualifications: I studie...”

MyTutor guarantee

You may also like...

Other A Level Physics questions

What is the main evidence for the Big Bang theory?

Give examples of how the photoelectric effect supports the particle nature of light and defies the wave theory.

How does energy flow from voltage source to resistor in a simple DC circuit?

What is the 'centre of gravity' of an object and how do I calculate it?

View A Level Physics tutors

Cookies:

We use cookies to improve our service. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok