chapter 8 end of chapter exercise Flashcards
1
Q
- Where did most of the H and He come from? Most of the intermediate elements lighter than Fe? Most of the elements heavier than Fe?
A
- stars
2. supernova
2
Q
- The solar nebula got hotter as it collapsed because _______ energy was being converted into _________ energy.
A
- gravitational energy
2. thermal/kinetic energy
3
Q
- When the spinning skater brings in her arms & legs then her angular momentum _____ (goes up, goes down, stays the same)
A
stays the same
4
Q
- Order the following chemicals from most refractory to least or equivalently from least volatile to most: H, NH_3, silicate, Fe
A
- Fe
- Silicate
- Nh_3,
- H
5
Q
58. Match the type or common state it was in with the material gas Fe ice H metal Nh3 rock silicate
A
gas—H
ice—Nh3
metal—Fe
rock—-silicate
6
Q
- Which comes closer to Jupiter: Earth or Saturn? (Hint: use Bode’s Rule).
A
Earth
7
Q
- Who discovered the first asteroid? Is it still an asteroid?
A
Piazzi and yes also considered a dwarf planet
8
Q
- What explains odd features of the solar system such as Venus’ retrograde spin, Uranus tipped on its side, Earth’s extra large Moon, Triton’s retrograde orbit, and so on?
A
something hitting it
9
Q
- Why is Earth thought to be over 4.5 billion years old when the oldest Earth rocks are only 4 billion years old?
A
earth melts rocks
10
Q
- Why is the Sun thought to be that same age?
A
because it is an educated guess
11
Q
- Which method has been most successful in discovering planets in our solar system? In discovering exo-planets?
A
- doppler shift
2. transit methods
12
Q
- Why are most of the planets discovered so far big planets orbiting close to their star?
A
stars are easier to detect
13
Q
- Does this make our Solar System (where the big planets are over 5 AUs from the Sun) special?
A
no. because we assume we are not special
14
Q
- How much of the radioactive sample remains after 3 half lives?
A
1/8
15
Q
- Why don’t geologists use C-14 to date dinosaur bones?
A
because they are too old
