At what orbital radius would a planet in our solar system have
to be to enjoy “Earth-like” temperatures and conditions when the
Sun arrives at the tip of its Red Giant “branch” (about 5 billion
years hence). Compare your answer to the present orbital radius of
Pluto. Assume that the orbit of earth is circular around the
sun.
The orbital region of Earth is known as the Goldilocks
region in our solar system where the probability of life to exist
is higher than any other regions which may be too hot or too cold.
My question: Why did we make such a wild assumption that, for life
to exist we need a neither hot nor cold region or there has to be
oxygen and water? There might be alien life which require say
Plutonium or Mercury to live....
In the inner solar system, (inside of Mars' orbit) a reasonable
characteristic temperature for planetary atmospheres is 200K.
suppose a certain molecule has two levels energies differ by amount
corresponding to the maximum frequency at this temperature. a.)
what is this maximum frequency and the corresponding energy of this
transition? b) By what factor does the rate of transitions between
the levels of our molecule differ from the rate of spontaneous
transition from the upper to lower level?
Why the planetary Solar system is stable?
Please, for better understanding I need a detailed description.
May be some examples in nature, schemes, and some description based
on basic relations. I want to understand it very well. Would be
nice to get some additional sources to read (books or
articles).
Which of the following has the highest Present Value? Select
one: a. $1,200/yr. for 10 years discounted at 10%. b. $1,200/yr.
for 10 years discounted at 8%. c. $1,000/yr. for 10 years
discounted at 10%. d. $1,000/yr. for 10 years discounted at 8%. e.
$1,200/yr. for 12 years discounted at 8%.
1. About 1 in 5 solar systems outside of our solar system has an
Earth-sized planet that could support life as we know it.
true
false
2. A major factor in the spread of transspecies hybrid viruses
is
A. lack of vaccines against these novel viruses
B. host organisms lack antibodies against these novel
pathogens
C. there is no herd immunity against novel pathogens
D. all of the above
9. The Drake Equation describes the odds of finding intelligent
life...
1. About 1 in 5 solar systems outside of our solar system has an
Earth-sized planet that could support life as we know it.
true
false
2. A major factor in the spread of transspecies hybrid viruses
is
A. lack of vaccines against these novel viruses
B. host organisms lack antibodies against these novel
pathogens
C. there is no herd immunity against novel pathogens
D. all of the above
9. The Drake Equation describes the odds of finding intelligent
life...
Which of the following is not true?
Select one:
A. An sp3 hybrid orbital may hold a lone pair of
electrons.
B. The sp3 hybrid orbitals are degenerate.
C. An sp3 hybrid orbital may form a sigma bond by
overlap with an orbital on another atom.
D. An sp3 hybrid orbital may form a pi bond by overlap
with an orbital on another atom.
Which of the following would produced the highest voltage in a
galvanic cell?
Select one:
a. 2Cr(s) + 3Ni2+(aq) →
2Cr3+ (aq) + 3Ni(s)
b. Li(s) + Ag+(aq) → Li+
(aq) + Ag(s)
c. Mg(s) + Zn2+(aq) →
Mg2+ (aq) + Zn(s)
d. Na(s) + K+(aq) → Na+
(aq) + K(s)