Suppose that a heavy person and a light person are balanced on a teeter-totter made of a plank of wood. Each person now moves in toward the fulcrum a distance of 25 cm. What effect will this have on the balance of the teeter-totter?
A) The teeter-totter will remain in balance.
B) The heavy person's end will go down.
C) The light person's end will go down.
D) One cannot tell whether either end will rise or fall without knowing the relative mass of the plank.
E) Only if the plank has significant mass will the light person's end go down.
C
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Which is true about cold dark matter?
a) Cold dark matter interacts strongly with ordinary baryonic matter via the strong force. b) Cold dark matter particles travel faster than the speed of light. c) Cold dark matter particles travel more slowly than hot dark matter particles. d) Cold dark matter exists only within planets and stars but not in other parts of galaxiesor intergalactic space. e) Cold dark matter emits X-rays, but no other forms of radiation.
One reason for the higher pitch of your voice after you've inhaled some helium is that sound travels
A) slower in helium than in air. B) faster in helium than in air. C) the same speed in helium but with a longer wavelength.
Which is the latest stage (of those given below) in the evolution of a star?
A) red giant B) white dwarf C) protostar D) geodesic E) supernova
Electrons emitted when light strikes the surface of a metal is
a. photon emission b. photon absorption c. the photoelectric effect d. a laser e. an emission spectrum