Which of the following describes a velocity (as opposed to a speed)?
A) 20 kilometers per hour, headed north
B) 300,000 kilometers per second
C) 9.8 meters per second squared (m/s2)
D) 15 newtons
E) 5 light-years
A) 20 kilometers per hour, headed north
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Planets do not move on a straight line. According to Newton's First Law of Motion, that means that there must be an outside ________ acting on them
Fill in the blank(s) with correct word
Redshift surveys give us:
A) an idea of how turbulent the intergalactic gas is. B) a 3-D layout of galaxies in space. C) the total mass of the universe. D) a more accurate census of the Local Group. E) a better value of the speed of light.
Armor asteroids cross into the orbit of which planet?
a. Mercury b. Venus c. Earth d. Mars e. Jupiter
The planet ______________ has retrograde motion
Fill in the blank(s) with correct word