Light takes approximately one second to travel from Earth to the Moon. This means that the Moon is approximately
A) 1 astronomical unit from Earth.
B) 1 light-year from Earth.
C) 3000 kilometers from Earth.
D) 300,000 kilometers from Earth.
E) near the top of Earth's atmosphere.
D) 300,000 kilometers from Earth.
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Relativity is the
A) study of how space, energy, and mass are related to time. B) concept that there are no absolutes that can be postulated. C) idea that space bends in relationship to the square of the mass contained within it. D) study of wormholes and time travel.
Kirchhoff's Rules: For the circuit shown in the figure, write the Kirchhoff current equation for the node labeled A. Notice the directions of the currents!
Fill in the blank(s) with the appropriate word(s).
When a lump of uranium is broken into smaller pieces, the total surface area
A) decreases. B) remains the same. C) increases.
A gasoline engine absorbs 2500 J of heat and performs 1000 J of mechanical work in each cycle. The amount of heat expelled in each cycle is
a. 1000 J b. 1500 J c. 2000 J d. 500 J e. 3000 J