Reference no: EM133296834
1. One of the main points we discussed in this class was how the universe started; which of the following questions best describes the scientific theory of how the universe started?
The theory of universe beginning.
The theory of acceleration.
The Big Bang theory, or theory of expansion.
The theory of universe development.
2. A main point of discussion in this course was the concept of how solar systems developed, with the center of solar systems being a star. At what point in solar system development is the star considered to be on the main sequence?
When the star is named.
When the star fuses hydrogen into hydrogen 2, and hydrogen 2 into helium.
When the star is hot.
When the start starts to spin.
3. One of the main discussion points in this astronomy course was the concept of what causes a nebula to contract and start to spin due to gravity. Given that the initial mass of a nebula is 3x10^30 Kg, which is rotating at 2km/s, and has a radius of 5x10^20 km; if the mass stays constant, what is the velocity of rotation after the solar system forms, if the final solar system radius is 5x10^10 Km? (Hint: the equation is given as M1V1R1=M2V2R2, where V2=(M1V1R1)/(M2R2), and M1=M2). Remember the concept of conservation of energy.
200 Km/s
500 Km/s
250Km/s
550Km/s
4. One of the essential astronomy topics we have discussed is the reason that Earth is protected from the electromagnetic and ionizing radiation (solar wind) from the Sun is one of the following.
Asteroid Belt
Water on Earth
Speed of Earth
Magnetic field