The scientist first credited for discovering the concept of inertia was
A) Aristotle.
B) Galileo.
C) Newton.
D) Copernicus.
Answer: B
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The strings in musical instruments that have greater mass tend to produce notes of
A) higher frequency. B) lower frequency. C) the same frequency. D) none of the above
Why can't we see back the whole way to the Big Bang?
a) Radiation is blueshifted out of the visible range. b) It would take too long for light to travel that far. c) Our telescopes could never be powerful enough. d) The radiation scatters off matter frequently so the Universe is opaque. e) Not enough photons were produced.
14C has an activity of 0.25 Bq per gram of carbon for living organisms. The half-life of 14C is 5730 years. If a sample of charcoal from an archeological dig yields a 14C activity of 0.15 Bq per gram of carbon, how old is the material?
a. 
b. 
c. 
d. 
e. 
How do we most accurately measure the distance to the Moon?
A. We measure the lunar period and use Kepler's Third Law. B. We measure its angular size and compare it to its actual diameter, which gives us its distance. C. We bounce a pulse of light off the lunar surface and measure how long the trip takes. D. We know how long it took Apollo astronauts to get there, and how fast the rocket traveled. E. All of these choices provide equally accurate measurements.