A Sense of Proportion: Arrange the following discoveries from earliest to most recent:
Answer: Expansion of universe , big bang , dark matter , dark energy
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This diagram represents Earth's rotation and orbit. What do we call the flat blue plane shown in this diagram?
A) the solar plane B) the ecliptic plane C) Earth's axis D) the galactic plane E) an astronomical unit
The following images show six objects in our solar system. Rank the objects from left to right based on their average distance from the Sun, from farthest to closest. (Not to scale.)
Why are molecular lines more complex than elemental spectral lines?
A) Molecules have two or more atoms.
B) Molecules can vibrate and rotate as well.
C) Molecules are heavier than atoms.
D) Molecules are the basis of life.
E) Most of the universe is made of molecules, not individual atoms.
A 5.0-kg mass is suspended by a string from the ceiling of an elevator that is moving upward with a speed which is decreasing at a constant rate of 2.0 m/s in each second. What is the tension in the string supporting the mass?
A. 49 N B. 39 N C. 59 N D. 10 N E. 42 N