Why do strange particles have long lifetimes compared to other strongly interacting particles?
a. No one knows—this is why they are called "strange.".
b. They only decay via the weak interaction.
c. They are more massive.
d. none of the above
B
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How can the Doppler method be used to estimate the average orbital distance of a planet's orbit?
A) by measuring the speed at which the star orbits the mutual center-of-mass of the star and planet, and using Newton's theory of gravity B) by measuring the time it takes for the star's line-of-sight velocity to cycle from peak to peak, and using Newton's version of Kepler's Third law C) by measuring the asymmetries in the velocity curve D) by measuring the amount by which the starlight is reduced when the planet transits
Because the _______________ of the Moon and the Sun vary slightly, the disk of the Moon is sometimes too small to cover the disk of the Sun
Fill in the blank(s) with correct word
Which of these has its center of mass where no mass exists?
A) baseball B) golf ball C) basketball D) none of the above
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
If 
and 
, what is the direction of the vector 
?
A. ?49°
B. ?41°
C. ?90°
D. +49°
E. +21°