What are the characteristics of an open cluster of stars?
A) mostly found above and below the galactic plane
B) old age and millions of members
C) a few hundred, mainly main sequence stars
D) All stars are much more massive than our Sun.
E) All stars are about the same age and luminosity.
C
You might also like to view...
The normal force is always vertical
Indicate whether the statement is true or false
When you sit on a chair, the reaction to your weight is
A) zero if in equilibrium. B) the chair pushing on you. C) the Earth being pulled up. D) your push down on the chair. E) the floor pushing up on the chair.
Jan and Len throw identical rocks off a tall building at the same time. The ground near the building is flat. Jan throws her rock straight downward
Len throws his rock downward and outward such that the angle between the initial velocity of the rock and the horizon is 30°. Len throws the rock with a speed twice that of Jan's rock. If air resistance is negligible, which rock hits the ground first? A) They hit at the same time. B) Jan's rock hits first. C) Len's rock hits first. D) It is impossible to know from the information given.
Asteroids are the densest form of interplanetary debris
Indicate whether the statement is true or false