How long does it take for a radio signal to travel to a spacecraft 
m away?
A. 5.0 s
B. 50 s
C. 
D. 
E. 
C.
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Imagine that you throw a ball directly upward. Which of the following best describes how Newton's 2nd law accounts for the motion of the ball when it reaches its maximum height?
What will be an ideal response?
Which statement about planetary rings is not true?
A) Rings are always located closer to a planet's surface than any large moons. B) Individual ring particles orbit their planet in accord with Kepler's laws, so that particles closer in orbit faster than particles farther out. C) Saturn's rings formed along with its moons 4.6 billion years ago. D) All four jovian planets have rings.
A gas of electrons and protons or other nuclei is called a(n) ______________
Fill in the blank(s) with correct word
To date a rock thought to be many millions of years old, you should not use the decay of
A) uranium to lead. B) potassium to argon. C) carbon-14.