When two galaxies collide, what happens to their stars?
A. About 30% of them collide and become black holes.
B. The evolution of all the stars in the larger galaxy is accelerated.
C. About 50% of them become binary stars.
D. Nothing happens to them, except that their orbits may change.
Answer: D
You might also like to view...
Moment of Inertia: A potter's wheel has the shape of a solid uniform disk of mass 7.0 kg and radius 0.65 m. It spins about an axis perpendicular to the disk at its center. A small 2.1 kg lump of very dense clay is dropped onto the wheel at a distance 0.41 m from the axis. What is the moment of inertia of the system about the axis of spin?
A. 1.8 kg ? m2 B. 1.5 kg ? m2 C. 0.40 kg ? m2 D. 2.5 kg ? m2
If Mars is on your meridian at midnight, it is a great time to view Mars and we say that Mars is at
a)Perihelio b)greatest elongation c)conjuction d)opposition
Two ways in which the starting conditions in a protogalactic cloud might cause it to become an elliptical (rather than spiral) galaxy are if the cloud begins with either
A) relatively little angular momentum or relatively high density. B) relatively high angular momentum or relatively low density. C) relatively high mass and a relatively low abundance of heavy elements. D) relatively low mass and a relatively high abundance of heavy elements.
What is the power of a lens that has a focal length of -40 cm and a width of 2.0 cm?
A) -2.5 diopters B) -0.50 diopters C) +2.5 diopters D) +4.0 diopters E) -50 diopters