Sedimentary layer A is found above sedimentary layer B, and the two are separated by a horizontal layer of ash, C. Therefore, the order from oldest to youngest is
a. B, C, A.
b. C, B, A.
c. A, C, B.
d. none of these.
a
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A runaway railroad car, with mass 30 × 10^4 kg, coasts across a level track at 2.0 m/s when it collides with a spring-loaded bumper at the end of the track. If the spring constant of the bumper is 4.0 × 10^6 N/m, what is the maximum compression of the spring during the collision? (Assume the collision is elastic.)
a. 0.77 m c. 0.34 m b. 0.55 m d. 1.07 m
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The terrestrial planets in our solar system are ________
A) Pluto and Eris B) Mars, Jupiter, Saturn, Uranus, and Neptune C) Mercury, Venus, Earth, and Mars D) Jupiter, Saturn, Uranus, and Neptune
a type of star cluster that contains mostly very old stars is
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