____ occur when the Moon is in the first or third quarter of its lunar cycle
A) Spring tides
B) Total solar eclipses
C) Neap tides
D) Annular eclipses
C
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Although the Sun's core has a density much greater than rock, it is considered a gaseous object because
A. the Sun formed from the Solar nebula which itself was a large gas and dust cloud. B. the Sun's high internal temperature prevent the atoms from bonding together to form a liquid or a solid. C. it is composed mostly of hydrogen. D. a large fraction of the Sun's interior is made of electromagnetic radiation (light).
Parallax is
a. the apparent motion of an object due to the motion of the observer. b. the distance between two foci of an ellipse. c. the small circle that the planets slid along in Ptolemy's geocentric universe. d. the circular orbits used in Copernicus' heliocentric universe. e. half the length of the shortest diameter of an ellipse.
A.A B.B C.C D.D E. Toward the viewer F. Away from the viewer T. The field is zero.
A skydiver of 75-kg mass has a terminal velocity of 60 m/s. At what speed is the resistive force on the skydiver half that when at terminal speed?
A. 15 m/s B. 49 m/s C. 30 m/s D. 42 m/s E. 36 m/s