If the plane of the Earth's equator were not tilted with respect to the ecliptic plane
a. the daylight period of Earth would be the same year-round.
b. there would be no seasonal changes.
c. Earth's poles would not experience six month long nights.
d. All of the above
Question 2From the mass-luminosity relation, a 2 solar mass star on the main sequence would have a luminosity of approximately ____ solar luminosities.
a. 2
b. 4
c. 11
d. 0.5
e. 0.25
Question 3If you lived on the Moon how often would the Earth set below your horizon?
a. Every 24 hours
b. Once a sidereal period (27.3 days)
c. Once a synodic period (29.5 days)
d. Every year
e. Never
Question 4If the orbital velocity of an eclipsing binary is 97 km/sec and the smaller star is completely eclipsed in 2 hours, what is the diameter of the smaller star?
a. 175,000 km
b. 350,000 km
c. 194 km
d. 700,000 km
e. 4656 km
Question 5If the Earth's rotational axis were to be perpendicular to the ecliptic, seasonal variations on the Earth would
a. be non-existent.
b. remain the same as they are at now.
c. have the same severity but each season would last twice as long.
d. be much more severe.
Question 6What is the total mass of a binary star system with P = 20 yr and a = 10 AU?
a. 2 solar masses
b. 2.5 solar masses
c. 0.5 solar mass
d. 80 solar masses
e. 0.4 solar mass
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