The tail of a comet is longest when the comet is
a. closest to the Sun.
b. farthest from the Sun.
c. closest to Earth.
d. farthest from Earth.
a
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When you measure distances to stars via parallax, it is better to use kilometers or Astronomical Units as the unit of distance
Indicate whether the statement is true or false
Jupiter is slowly shrinking through gravitational contraction today
Indicate whether the statement is true or false
A 0.330-kg volleyball is thrown vertically downward with a speed of 0.150 m/s in a place where g = 9.81 m/s2. It takes it 0.0655 s to reach the ground. What is the magnitude of its momentum just before it hits the ground?
A) 0.212 kg ? m/s B) 0.262 kg ? m/s C) 0.163 kg ? m/s D) 0.0216 kg ? m/s E) 0.0418 kg ? m/s
The currently accepted reasoning for why the cosmic background radiation is so uniform in temperature is because
A) this temperature uniformity was achieved in the moments before cosmic inflation. B) as the universe has had time to cool, the hotter parts transferred their heat to the cooler regions. C) microwaves can only function at a certain very limited range of temperature. D) space is a vacuum and thus cannot retain heat very well.