What is the mass of a mole of oxygen gas?
a. 8.0 g b. 16 g
c. 24 g d. 32 g
d
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What causes the long tail to protrude from this galaxy?
A: A supernova explosion blew material out in that direction. B: The galaxy is moving so fast through space that it's leaving a trail of heavier matter behind. C: A unique and yet unexplained phenomenon creates an anti-gravity effect that's pushing stars out of the galaxy. D: Tidal forces caused by interaction with another galaxy are drawing the material off. E: An incredibly powerful extraterrestrial civilization is reshaping the galaxy to suit its tastes.
What makes us think that the star system Cygnus X-1 contains a black hole?
A) It emits x-rays as we expect from a system with an accretion disk, but the unseen star in the system is too massive to be a neutron star. B) No light is emitted from this star system, so it must contain a black hole. C) The fact that we see strong x-ray emission tells us that the system must contain a black hole. D) Cygnus X-1 is a powerful x-ray burster, so it must contain a black hole.
We now recognize that the largest Kuiper Belt Object could be ________, discovered almost a century ago
Fill in the blank(s) with correct word
At a given instant, the acceleration of a certain particle is zero. This means that
A) the velocity is constant. B) the velocity is increasing. C) the velocity is decreasing. D) the velocity is not changing at that instant. E) the velocity is zero.