What term describes "all populations of all species living in the same area"?
a. ecosystem
b. community
c. biosphere
d. organism
e. population
b
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The peak of the quasar epoch was:
A) when there was still enough dark matter to fuel the supermassive black holes in their bar. B) when there was still sufficient mass to fuel the supermassive black holes at their center. C) before the formation of galaxies. D) before the star formation epoch. E) before mass had a chance to accumulate at the nucleus.
According to the principle of equivalence, observations made of falling objects at Galileo's Leaning Tower of Pisa are indistinguishable from observations made in
A) a spaceship orbiting in a gravitational field. B) a spaceship accelerating at g in deep space. C) any uniformly moving reference frame. D) all of the above E) none of the above
A voltage reading is obtained by placing a voltmeter across a resistor. What happens to the total current flowing in the circuit as a result of this action?
A) The current increases. B) The current decreases. C) The current does not change. D) The current increases if the meter's internal resistance is less than the original resistance in the circuit and decreases if its internal resistance is greater than the circuit's original resistance.
The type of lens that brings parallel light rays together is a
A) converging lens. B) diverging lens. C) combination of converging-diverging lens.