What is the saros cycle?
A) the 26,000-year cycle of the Earth's precession
B) the roughly 18-year cycle over which the pattern of eclipses repeats
C) the roughly one-month cycle of lunar phases in the sky
D) the annual cycle of the seasons
B
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A solid right circular cylinder of a substance has a radius 10.0 cm and a height 12.0 cm. The mass of the cylinder is 4.00 kg. What is the density of the substance?
A) 1.59 × 103 kg/m3 B) 1.33 × 103 kg/m3 C) 2.12 × 103 kg/m3 D) 1.86 × 103 kg/m3 E) 1.06 × 103 kg/m3
Which of these is the kinetic energy of a particle of mass m moving at speed v?
a. KE = ½ mv2 b. KE = ½ mv c. KE = K + E d. KE = mv2 e. KE = ½ m2v
Why is the post-Main Sequence structure of a high mass star sometimes described by an "onion-layer" model? Explain
What will be an ideal response?
Earth's temperature remains fairly steady, which means that Earth must return nearly the same amount of energy to space that it receives from the Sun. In what form(s) does Earth return most of this energy to space?
a. infrared light emitted by the surface and atmosphere b. ultraviolet light reflected by the surface c. visible light reflected by clouds d. visible light emitted by the surface and atmosphere e. visible light reflected by the surface