In the fission theory of the Moon's origin
a. the Moon broke from a rapidly spinning Earth
b. the Earth and its Moon formed from the same cloud of matter
c. the Moon formed elsewhere in the solar nebula and was later captured by Earth.
d. the Moon formed when a very massive planetesimal smashed into the young Earth.
A
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The Sun is on the celestial equator at the times of the
a. vernal equinox and the summer solstice. b. autumnal equinox and the vernal equinox. c. summer solstice and the winter solstice. d. autumnal equinox and the winter solstice. e. Sun is on the ecliptic and is never on the celestial equator.
When an ice cube in a glass of water melts, the water level
A) rises. B) falls. C) remains the same.
A 3.0-kg block slides on a rough horizontal surface. A force of 8.0 N acting parallel to the surface is applied to the block. The coefficient of kinetic friction between the block and the surface is 0.15. What is the magnitude of the block's acceleration?
A. 1.9 m/s2 B. 1.2 m/s2 C. 2.3 m/s2 D. 1.5 m/s2 E. 2.9 m/s2
Galaxies formed from tiny density perturbations that formed prior to the inflationary period
Indicate whether the statement is true or false