The first-quarter Moon rises
a. at about noon.
b. at sunset.
c. at sunrise.
d. at about midnight.
e. during the second week of each calendar month.
a
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What causes some asteroids leave the asteroid belt and sometimes approach Earth?
A. Because Earth's gravitational field attracts them. B. Because Jupiter's gravitational field ejects them. C. Because they crash into one another and get ejected.
Calculate
In the diagram, if the current through R1 is 5 A up and if the current through R3 is 3 A up, what is the current in R2?
]
A. 8 A up
B. 8 A down
C. 2 A up
D. 2 A down
E. more information is needed
Binding energy per nucleon in a nucleus is
A. the same for all nuclei. B. the greatest for the largest nuclei. C. the greatest for the smallest nuclei. D. the greatest for medium-sized nuclei.