1.Which of the following is NOT thought to be a common trigger for the collapse
ID: 105914 • Letter: 1
Question
1.Which of the following is NOT thought to be a common trigger for the collapse of molecular clouds (leading to star formation)?
spiral density waves
molecular cloud collisions
supernova explosions
stellar collisions (star collisions)
intense stellar winds from massive stars
2: Which of the following must balance against gravitational pressure to allow a mian sequence star to reach equilibrium?
thermal pressure
nuclear pressure
degeneracy pressure
radiation pressure
spiral density waves
molecular cloud collisions
supernova explosions
stellar collisions (star collisions)
intense stellar winds from massive stars
2: Which of the following must balance against gravitational pressure to allow a mian sequence star to reach equilibrium?
thermal pressure
nuclear pressure
degeneracy pressure
radiation pressure
Explanation / Answer
Question 2) option a) thermal pressure
Reason : for main-sequence stars to be in hydrostatic equilibrium, the outward thermal pressure from the hot core is balanced by the gravitational pressure from inwards
Question 1) option E) stellar collisions (star collisions)
Reason : the following below acts to be the trigger for star formation
1) Shocks from supernova
2)Collisions of giant molecular clouds
3) rotating shock wave patterns in galaxies ( spiral arms)
4) stellar clouds from massive stars
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.