The phase of the Moon on a particular night is determined by
a. the season of the year.
b. the speed of the Moon in is orbit.
c. the relative positions of the Sun, Earth, and Moon.
d. how the Earth's shadow hits the Moon.
e. the distance from the Earth to the Moon.
c
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The best site for placing a ground-based optical telescope is ________.
A. a mountaintop B. in a location that has few sunny days throughout the year C. in an urban setting D. a valley
Which of the following statements best describes the current state of understanding regarding the apparent acceleration of the expansion of the universe?
A) The cause of the acceleration is well-understood, and attributed to the particles that make up dark energy. B) The acceleration is very important in the cosmos today, but the evidence indicates that it will eventually slow down, allowing the universe to recollapse. C) The acceleration probably is not real, and what we attribute to acceleration is probably just a misinterpretation of the data. D) We have moderately strong evidence that the acceleration is real, but essentially no idea what is causing it.
Igneous rock that formed below Earth's surface by solidification of magma is known as
a. extrusive rock. b. intrusive rock. c. metamorphic rock. d. silicate rock.
How much work is done by a person lifting a 2.0-kg object from the bottom of a well at a constant speed of 2.0 m/s for 5.0 s?
a. 0.22 kJ b. 0.20 kJ c. 0.24 kJ d. 0.27 kJ e. 0.31 kJ