What is the mass-to-light ratio for the inner region of the Milky Way Galaxy, in units of solar masses per solar luminosity?
A) 1,000
B) 600
C) 100
D) 6
E) 0.1
D
You might also like to view...
Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a 30.0 degrees incline. The inclined surface has a coefficient of kinetic friction of 0.200. The vertically hanging mass is 6.00 kg and the mass on the incline is 4.00 kg. The acceleration of the 4.00 kg mass is (the initial velocity is zero)
A. 7.16 
B. 5.84
C. 2.98
D. 1.53
E. 0.00
If an average hydrogen atom in Earth's atmosphere has a velocity of 2.5 km/s, what would be the average velocity of an oxygen molecule in Earth's atmosphere? Note that the atomic mass of an oxygen atom is 16 times that of a hydrogen atom.
a. 0.16 km/s b. 2.5 km/s c. 0.62 km/s d. 0.44 km/s e. 0.25 km/s
Consider a system containing three objects that move with different velocities. The objects can interact with each other through forces. In this system
A. the objects can only collide if an outside force is applied. B. any collisions between the objects must be elastic. C. the total momentum of the objects cannot change unless an outside force acts on the system. D. the total kinetic energy of the objects will not change unless an outside force is applied.
When only part of the Moon is covered by Earth's full shadow (umbra), we see a(n)
A) total lunar eclipse. B) penumbral lunar eclipse. C) partial lunar eclipse. D) partial solar eclipse. E) annular eclipse.