A hockey puck traveling at speed v on essentially frictionless ice collides with one end of a straight stick lying flat on the ice and sticks to that end. In this collision
a. momentum is conserved.
b. angular momentum is conserved.
c. energy is conserved.
d. all of the above are conserved.
e. only momentum and angular momentum are conserved.
e
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If two polymers mix in the liquid state, this is called a(n) _________.
Fill in the blank(s) with the appropriate word(s).
Is there a force on the moon, and how do you know?
A) No, because the moon moves at an unchanging speed. B) No, because the moon is not accelerated. C) Yes, because there must be a force to keep the moon moving. D) Yes, because the moon is accelerated. E) Yes, because there must be a force pulling outward on the moon, away from Earth, to keep the moon from falling down to Earth.
Which of the following best sums up current scientific thinking about the nature of dark matter?
A) Most dark matter probably consists of weakly interacting particles of a type that we have not yet identified. B) Dark matter consists primarily of a mysterious form of energy that is causing the expansion of the universe to accelerate. C) There is no longer any doubt that dark matter is made mostly of WIMPs. D) Dark matter probably does not really exist, and rather indicates a fundamental problem in our understanding of gravity.
What can we infer, at least roughly, from a star's luminosity class?
A) its age in years B) its surface temperature C) its size (radius) D) its mass