Arcturus shows a large proper motion, almost perpendicular to the galactic plane. What Population does it belong to, and why?
What will be an ideal response?
Arcturus is the brightest Population II star in the sky, revealed by its lack of metals and its comet-like motion cutting across the galactic disk.
You might also like to view...
Projectile Motion: A projectile is fired from ground level on a horizontal plain. If the initial speed of the projectile is now doubled, and we neglect air resistance,
A. its range will be increased by 
.
B. its range will double.
C. its range will be decreased by a factor of two.
D. its range will quadruple.
E. its range will decrease by a factor of four.
CP titanium alloys are primarily solid solution strengthened by the addition of the element _________.
Fill in the blank(s) with the appropriate word(s).
The Concorde's exterior is made of aluminum, which has a coefficient of linear expansion of 24 × 10-6 K-1. At 15°C, the Concorde measures 62.1 m in length
When the plane is in flight, friction with the air increases the temperature of the exterior skin to 200°C. What is the change in the length of the outer skin of the Concorde? A) 20 cm B) 24 cm C) 28 cm D) 32 cm E) 36 cm
Size of the Nucleus: Estimate the radius of a nucleus with mass 50 u. (mneutron ? mproton = 1.67 × 10-27 kg)
A. about 4.4 fm B. about 8.5 fm C. about 3.7 fm D. about 6.2 fm